 | This article needs additional citations for verification .(November 2015) |
| Ohio State Routes | |
|---|---|
   Typical highway markers | |
 Map of all Ohio highways
| |
| System information | |
| Formed | 1912, renumbered in 1923, 1927, 1962 |
| State | State Route nn (SR nn) |
| System links | |
| |
State Routes in Ohio are owned by the state, and maintained by the state except in cities (see Numbered highways in Ohio). They are signed with a white silhouette of Ohio against a black background.
   | Marker design in use from the early 1920s to 1926 |
   | Marker design in use from 1927 to 1948 |
   | Marker design in use from 1948 to 1961 |
   | Marker design in use from 1962 to 1966 |
   | Marker design in use from 1967 to 1970 |
   | Marker design used in Ohio since 1971 |
| Date ranges are approximate |
| Number | Length (mi) [1] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | ||
|---|---|---|---|---|---|---|---|---|
| SR 1 | 227.77 | 366.56 | New Paris | Bridgeport | 1912 | 1926 | ||
 SR 1 | 353.15 | 568.34 | I-75 at the Kentucky state line in Cincinnati | I-90 at the Pennsylvania state line in Conneaut | 1961 | 1965 | ||
| SR 2 | 227.13 | 365.53 | SR 37 in Hicksville Township | US 20 in Painesville Township | 1912 | current | ||
 SR 3 | 255.52 | 411.22 | US 27/US 42/US 52/US 127 in Cincinnati | US 6/US 20/US 42/US 322/US 422 in Cleveland | 1923 | current | ||
 SR 4 | 207.22 | 333.49 | US 42 in Cincinnati | US 6/SR 101 in Sandusky | 1912 | current | ||
| SR 5 | — | — | Delphos | Wooster | 1923 | 1931 | ||
 SR 5 | 51.24 | 82.46 | I-76/SR 44 in Rootstown Township | PA 58 at Pennsylvania state line in Kinsman Township | 1932 | current | ||
 SR 6 | — | — | Cincinnati | Toledo | 1923 | 1926 | ||
 SR 6 | — | — | Bridgeport | Norwalk | 1926 | 1928 | ||
| SR 6 | — | — | Cleveland | Painesville | 1929 | 1931 | ||
| SR 7 | 335.98 | 540.71 | US 52 in Union Township | SR 531 in Conneaut | 1912 | current | ||
 SR 8 | 38.39 | 61.78 | I-76/I-77 in Akron | US 6/US 20/US 42/US 322/US 422 in Cleveland | 1923 | current | ||
 SR 9 | — | — | Cincinnati | Pioneer | 1923 | 1930 | ||
 SR 9 | 92.51 | 148.88 | SR 148 in Washington Township | US 62 in Salem | 1934 | current | ||
 SR 10 | — | — | Delphos | Plain Township | 1923 | 1926 | ||
 SR 10 | — | — | Washington Court House | Zanesville | 1926 | 1931 | ||
| SR 10 | — | — | Aberdeen | Toledo | 1932 | 1932 | ||
 SR 10 | 23.64 | 38.04 | US 20/SR 57/SR 301 in Eaton Township | US 422 in Cleveland | 1934 | current | ||
 SR 11 | — | — | Gallipolis | New Paris | 1923 | 1935 | ||
| SR 11 | 99.60 | 160.29 | US 30 in East Liverpool | SR 531 in Ashtabula | 1967 | current | ||
 SR 12 | 60.84 | 97.91 | SR 115/SR 189 in Sugar Creek Township | SR 53 in Ballville Township | 1923 | current | ||
 SR 13 | — | — | Bridgeport | Cleveland | 1923 | 1926 | ||
 SR 13 | 166.15 | 267.39 | SR 550 in Athens Township | US 6 in Huron | 1926 | current | ||
 SR 14 | 81.53 | 131.21 | US 6/US 20/US 42/US 322/US 422 in Cleveland | PA 51 at Pennsylvania state line in Unity Township | 1923 | current | ||
 SR 15 | — | — | Cleveland | Williamsfield | 1912 | 1926 | ||
 SR 15 | 102.31 | 164.65 | US 23/SR 103 in Carey | M-99 at Michigan state line in Madison Township | 1926 | current | ||
 SR 16 | — | — | Cleveland | Coitsville Township | 1923 | 1926 | ||
 SR 16 | 70.46 | 113.39 | US 40/Civic Center Drive in Columbus | US 36 in Jackson Township | 1926 | current | ||
 SR 17 | — | — | Harrison Township | Lowellville | 1923 | 1933 | ||
 SR 17 | 21.04 | 33.86 | SR 10 in North Olmsted | SR 43 in Bedford Heights | 1935 | current | ||
 SR 18 | 197.36 | 317.62 | SR 8 at Indiana state line in Hicksville Township | SR 91 in Akron | 1923 | current | ||
| SR 19 | — | — | Columbus | Masury | 1923 | 1931 | ||
 SR 19 | 86.48 | 139.18 | US 42 in Congress Township | SR 2 in Carroll Township | 1932 | current | ||
 SR 20 | — | — | Columbus | East Liverpool | 1923 | 1926 | ||
 SR 21 | — | — | Columbus | Findlay | 1923 | 1926 | ||
 SR 21 | 59.77 | 96.19 | US 250 in Franklin Township | I-77 in Cuyahoga Heights | 1971 | current | ||
 SR 22 | — | — | Marion | Indiana state line | 1923 | 1926 | ||
 SR 23 | — | — | Columbia | Lacarne | 1923 | 1926 | ||
 SR 24 | — | — | Hillsboro | Pomeroy | 1923 | 1926 | ||
 SR 25 | — | — | Cincinnati | Friendship | 1923 | 1926 | ||
 SR 25 | 34.98 | 56.29 | I-75 in Henry Township | I-280 in Toledo | 1973 | current | ||
 SR 26 | 66.91 | 107.68 | SR 7 in Marietta | SR 148 in Wayne Township | 1923 | current | ||
 SR 27 | — | — | Cincinnati | Logan | 1923 | 1926 | ||
 SR 28 | — | — | Cincinnati | West Jefferson | 1923 | 1926 | ||
 SR 28 | 69.82 | 112.36 | US 50 in Milford | US 50 in Twin Township | 1926 | current | ||
 SR 29 | 102.94 | 165.67 | SR 67 at Indiana state line in Washington Township | US 40 in West Jefferson | 1923 | current | ||
 SR 30 | — | — | Chauncey | Sandusky | 1923 | 1926 | ||
 SR 31 | — | — | Antwerp | Toledo | 1923 | 1926 | ||
 SR 31 | 32.12 | 51.69 | SR 38 in Marysville | US 68 in Kenton | 1926 | current | ||
 SR 32 | — | — | Washington Township | Marysville | 1923 | 1937 | ||
 SR 32 | 182.71 | 294.04 | US 50/SR 561 in Cincinnati | WV 618 at West Virginia state line in Belpre | 1962 | current | ||
 SR 33 | — | — | Lima | Chesterfield Township | 1923 | 1937 | ||
 SR 34 | 31.97 | 51.45 | SR 427 at Indiana state line in Florence Township | US 6 in Ridgeville Township | 1923 | current | ||
 SR 35 | — | — | Malaga | Salem | 1923 | 1934 | ||
 SR 36 | — | — | Wooster | Kinsman Township | 1923 | 1931 | ||
 SR 37 | 174.21 | 280.36 | US 224/SR 12 in Findlay | SR 60/SR 78 in McConnelsville | 1923 | current | ||
 SR 38 | 48.67 | 78.33 | US 62/SR 3 in Union Township | SR 31 in Marysville | 1923 | current | ||
 SR 39 | 154.11 | 248.02 | SR 103 in Auburn Township | PA 68 at Pennsylvania state line in East Liverpool | 1923 | current | ||
| SR 40 | — | — | Washington Court House | Zanesville | 1923 | 1926 | ||
 SR 41 | 155.21 | 249.79 | US 52/US 62 Bus./US 68 Bus. in Aberdeen | US 36/SR 48 in Covington | 1923 | current | ||
 SR 42 | — | — | Marion | Liberty Township | 1923 | 1926 | ||
 SR 43 | 122.57 | 197.26 | SR 7 in Steubenville | US 6/US 20/US 42/US 322/US 422 in Cleveland | 1923 | current | ||
 SR 44 | 81.23 | 130.73 | SR 43 in Sandy Township | Headlands Beach State Park in Painesville Township | 1923 | current | ||
 SR 45 | 96.56 | 155.40 | SR 7/SR 39 in Wellsville | SR 531 in Saybrook Township | 1923 | current | ||
 SR 46 | 76.66 | 123.37 | SR 170/SR 558 in East Palestine | SR 11 in Plymouth Township | 1923 | current | ||
 SR 47 | — | — | Union Township | Findlay | 1923 | 1931 | ||
 SR 47 | 105.23 | 169.35 | SR 32 at Indiana state line in Union City | SR 98/SR 423 in Waldo | 1933 | current | ||
 SR 48 | — | — | Fly | Dennison | 1923 | 1926 | ||
 SR 48 | 83.03 | 133.62 | SR 132 in Goshen Township | SR 66 in Loramie Township | 1926 | current | ||
 SR 49 | — | — | Cambridge | Steubenville | 1923 | 1926 | ||
 SR 49 | 153.06 | 246.33 | US 35 in Trotwood | M-49 at Michigan state line in Northwest Township | 1926 | current | ||
 SR 50 | — | — | Lebanon | Newberry Township | 1923 | 1926 | ||
 SR 51 | — | — | Dayton | Greenville | 1923 | 1934 | ||
 SR 51 | 30.73 | 49.46 | US 20 in Washington Township | US 23 /US 223/SR 184 in Sylvania | 1955 | current | ||
 SR 52 | — | — | Middletown | Irwin | 1923 | 1926 | ||
 SR 53 | 92.75 | 149.27 | US 68/SR 67 in Kenton | Ferry to South Bass Island in Catawba Island Township | 1923 | current | ||
 SR 54 | 22.97 | 36.97 | SR 41 in Harmony Township | US 36/SR 29 in Urbana | 1938 | current | ||
 SR 55 | 37.87 | 60.95 | SR 571 in Union Township | US 68 in Urbana | 1923 | current | ||
 SR 56 | 108.74 | 175.00 | SR 29 in Union Township | SR 682 in Athens | 1923 | current | ||
 SR 57 | 61.22 | 98.52 | US 30 in East Union Township | US 6 in Lorain | 1938 | current | ||
 SR 58 | 41.63 | 67.00 | US 250 in Ashland | US 6 in Lorain | 1923 | current | ||
 SR 59 | — | — | Bellevue | Elyria | 1923 | 1938 | ||
 SR 59 | 22.66 | 36.47 | I-76/I-77 in Akron | SR 5 in Ravenna Township | 1969 | current | ||
 SR 60 | 189.92 | 305.65 | WV 31 at West Virginia state line in Marietta | US 6 in Vermilion | 1923 | current | ||
 SR 61 | 91.16 | 146.71 | US 36/SR 3 in Sunbury | US 6 in Berlin Township | 1923 | current | ||
 SR 62 | — | — | Galion | Oak Harbor | 1923 | 1931 | ||
 SR 63 | — | — | Carey | Sylvania | 1923 | 1926 | ||
 SR 63 | 11.74 | 18.89 | SR 4 in Monroe | US 42/SR 48/SR 123 in Lebanon | 1926 | current | ||
 SR 64 | 36.47 | 58.69 | I-75/SR 105 in Bowling Green | Loar Highway in Amboy Township | 1923 | current | ||
 SR 65 | 115.84 | 186.43 | SR 47 in Salem Township | I-280 in Toledo | 1923 | current | ||
 SR 66 | 118.60 | 190.87 | US 36 in Piqua | US 20 in Fayette | 1923 | current | ||
 SR 67 | 84.78 | 136.44 | US 33 in Wapakoneta | SR 18/SR 19 in Republic | 1923 | current | ||
 SR 68 | — | — | Union City | Waldo | 1923 | 1932 | ||
 SR 69 | — | — | Dayton | Tontogany | 1923 | 1968 | ||
 SR 70 | — | — | Cynthiana | Covington | 1923 | 1962 | ||
 SR 71 | — | — | Union City | Crystal Lakes | 1923 | 1962 | ||
 SR 72 | 53.26 | 85.71 | US 62 in Penn Township | SR 334 in Moorefield Township | 1923 | current | ||
 SR 73 | 134.80 | 216.94 | US 27 in Oxford | US 23/SR 104 in Portsmouth | 1923 | current | ||
 SR 74 | — | — | Cincinnati | Franklin Township | 1923 | 1962 | ||
 SR 75 | — | — | Ironton | Stone Creek | 1923 | 1962 | ||
 SR 76 | — | — | Belpre | Avon Lake | 1923 | 1972 | ||
 SR 77 | — | — | Marietta | Shreve | 1923 | 1962 | ||
 SR 78 | 104.96 | 168.92 | US 33/SR 691 in Nelsonville | SR 7 in Clarington | 1923 | current | ||
 SR 79 | 45.65 | 73.47 | SR 37 on Walnut–Union township line | US 36 in Nellie | 1923 | current | ||
 SR 80 | — | — | Sandyville | Edinburg | 1923 | 1962 | ||
 SR 81 | — | — | Brentwood Lake | Aurora | 1923 | 1926 | ||
 SR 81 | 70.49 | 113.44 | SR 124 at Indiana state line in Willshire Township | SR 53 in Patterson | 1926 | current | ||
 SR 82 | 88.56 | 142.52 | SR 57 in Carlisle Township | US 62 in Brookfield Township | 1923 | current | ||
| SR 83 | — | — | Ashtabula | Monroe Township | 1923 | 1957 | ||
 SR 83 | 157.37 | 253.26 | SR 60 in Waterford Township | US 6 in Avon Lake | 1972 | current | ||
 SR 84 | 63.34 | 101.94 | US 6/US 20 in Euclid | PA 226 at Pennsylvania state line in Monroe Township | 1923 | current | ||
 SR 85 | 2.66 | 4.28 | US 6/SR 7 in Andover | PA 285 at Pennsylvania state line in Andover Township | 1923 | current | ||
 SR 86 | 21.98 | 35.37 | US 20 in Painesville | SR 534 in Windsor Township | 1923 | current | ||
 SR 87 | 60.32 | 97.08 | US 6/US 20/US 42/US 322/US 422 in Cleveland | SR 5/SR 7 in Kinsman Township | 1923 | current | ||
 SR 88 | 48.24 | 77.63 | SR 59 in Ravenna | PA 358 at Pennsylvania state line in Vernon Township | 1923 | current | ||
 SR 89 | — | — | Canton | Aurora | 1923 | 1926 | ||
 SR 89 | 18.42 | 29.64 | SR 95 in Mohican Township | SR 58 in Jackson Township | 1926 | current | ||
| SR 90 | — | — | Petersburg | North Kingsville | 1923 | 1962 | ||
 SR 91 | 44.12 | 71.00 | US 224 in Springfield Township | SR 283 on Timberlake–Eastlake municipal line | 1912 | current | ||
 SR 92 | — | — | Ghent | Ghent | 1923 | 1936 | ||
| SR 93 | 232.46 | 374.11 | US 52 in Upper Township | SR 261 in Akron | 1923 | current | ||
 SR 94 | 54.50 | 87.71 | US 250/SR 241 in Mount Eaton | US 42/SR 3 in Cleveland | 1923 | current | ||
 SR 95 | — | — | Strasburg | Wooster | 1923 | 1926 | ||
 SR 95 | 89.04 | 143.30 | SR 37 in La Rue | SR 3 in Wooster Township | 1926 | current | ||
 SR 96 | 35.93 | 57.82 | SR 98 in Liberty Township | US 42/US 250 in Ashland | 1923 | current | ||
 SR 97 | 34.60 | 55.68 | SR 19/SR 61/SR 309 in Galion | SR 3 in Hanover Township | 1923 | current | ||
 SR 98 | 46.18 | 74.32 | SR 47/SR 423 in Waldo | SR 61 in Plymouth | 1923 | current | ||
 SR 99 | 22.61 | 36.39 | US 224 in Willard | SR 4 in Groton Township | 1923 | current | ||
 SR 100 | 38.95 | 62.68 | SR 309 in Tully Township | SR 53 in Tiffin | 1923 | current | ||
 SR 101 | 34.79 | 55.99 | SR 18/SR 53 in Tiffin | US 6 in Sandusky | 1923 | current | ||
 SR 102 | — | — | Elmore | Toledo | 1923 | 1939 | ||
 SR 102 | — | — | Toledo | Michigan | 1946 | 1949 | ||
 SR 103 | 77.02 | 123.95 | I-75 in Richland Township | SR 61 in New Haven Township | 1923 | current | ||
 SR 104 | 95.17 | 153.16 | US 23/SR 73 in Portsmouth | US 33 in Columbus | 1923 | current | ||
 SR 105 | 28.39 | 45.69 | I-75/SR 64 in Bowling Green | SR 19 /SR 163 in Oak Harbor | 1923 | current | ||
 SR 106 | — | — | Gomer | Findlay | 1923 | 1937 | ||
 SR 107 | 11.05 | 17.78 | SR 49 in Florence Township | US 20A/SR 15 in Jefferson Township | 1923 | current | ||
 SR 108 | — | — | Hicksville Township | Bryan | 1923 | 1936 | ||
 SR 108 | 49.21 | 79.20 | SR 15 in Greensburg Township | M-156 at Michigan state line in Chesterfield Township | 1938 | current | ||
 SR 109 | — | — | Harrison Township | Ottawa | 1923 | 1926 | ||
 SR 109 | 52.96 | 85.23 | US 224/SR 15/SR 65 in Ottawa | M-52 at Michigan state line in Royalton Township | 1926 | current | ||
 SR 110 | 10.70 | 17.22 | SR 108 in Napoleon | SR 65 in Damascus Township | 1923 | current | ||
 SR 111 | 31.49 | 50.68 | Woodburn Road/State Line Road in Harrison Township | SR 15/SR 18/SR 66 in Defiance | 1923 | current | ||
 SR 112 | — | — | Sylvania | Toledo | 1923 | 1926 | ||
 SR 112 | — | — | Portsmouth | Waverly | 1926 | 1950 | ||
 SR 112 | — | — | Toledo | Toledo | 1965 | 1973 | ||
 SR 113 | 59.64 | 95.98 | US 20/SR 18/SR 269 in Bellevue | US 6/US 20/SR 2 in Lakewood | 1923 | current | ||
 SR 114 | 32.99 | 53.09 | State Line Road in Benton Township | US 224/SR 115 in Kalida | 1923 | current | ||
 SR 115 | 21.65 | 34.84 | SR 65 in Lima | SR 15 in Palmer Township | 1923 | current | ||
 SR 116 | 30.81 | 49.58 | SR 29/SR 66/SR 703 in St. Marys | US 127 in Van Wert | 1923 | current | ||
 SR 117 | 59.57 | 95.87 | SR 118 in Dublin Township | US 33 in McArthur Township | 1923 | current | ||
 SR 118 | 55.26 | 88.93 | SR 49/SR 121/SR 502/SR 571 in Greenville | US 127 in Van Wert | 1923 | current | ||
 SR 119 | 41.94 | 67.50 | SR 26 at Indiana state line in Recovery Township | SR 65 in Jackson Township | 1923 | current | ||
 SR 120 | — | — | Brock | Piqua | 1923 | 1939 | ||
 SR 120 | 37.72 | 60.70 | Morenci Road in Chesterfield Township | SR 65 in Toledo | 1940 | current | ||
 SR 121 | 35.94 | 57.84 | SR 121 at Indiana state line in Jefferson Township | SR 47/SR 185 in Versailles | 1923 | current | ||
 SR 122 | 43.26 | 69.62 | Old SR 122 at Indiana state line on Dixon–Jackson township line | SR 48 in Clearcreek Township | 1923 | current | ||
 SR 123 | 43.61 | 70.18 | SR 251 in Perry Township | SR 4 in German Township | 1923 | current | ||
| SR 124 | — | — | Sharonville | Franklin | 1923 | 1926 | ||
 SR 124 | 165.51 | 266.36 | SR 134 in Clark Township | US 50/SR 7/SR 32 in Troy Township | 1926 | current | ||
 SR 125 | — | — | Monroe | Lebanon | 1923 | 1926 | ||
 SR 125 | 85.79 | 138.07 | US 50/SR 561 in Cincinnati | US 52 in Nile Township | 1926 | current | ||
 SR 126 | — | — | Hamilton | College Corner | 1923 | 1926 | ||
 SR 126 | 41.18 | 66.27 | SR 252 at Indiana state line on Reily–Monroe township line | US 50/SR 28 in Milford | 1926 | current | ||
 SR 127 | — | — | Scipio | Hamilton | 1923 | 1926 | ||
 SR 128 | 22.53 | 36.26 | US 50 in Cleves | SR 4/SR 129/SR 177 in Hamilton | 1923 | current | ||
 SR 129 | — | — | Scipio | Cincinnati | 1923 | 1926 | ||
 SR 129 | 25.86 | 41.62 | SR 126 in Morgan Township | I-75 in Liberty Township | 1926 | current | ||
 SR 130 | — | — | Harrison | Cheviot | 1923 | 1926 | ||
 SR 130 | 4.72 | 7.60 | US 27 in Hanover Township | SR 177 in Hamilton | 1926 | current | ||
 SR 131 | 29.98 | 48.25 | US 50 in Milford | SR 138 in Hamer Township | 1923 | current | ||
 SR 132 | 40.52 | 65.21 | US 52 in New Richmond | SR 133/SR 350 in Clarksville | 1923 | current | ||
 SR 133 | 49.45 | 79.58 | US 52 in Franklin Township | SR 132/SR 350 in Clarksville | 1923 | current | ||
 SR 134 | 41.21 | 66.32 | SR 32 in Sardinia | Main Street in Port William | 1923 | current | ||
 SR 135 | 2.82 | 4.54 | US 50 in Dodson Township | SR 134 in Lynchburg | 1923 | current | ||
 SR 136 | 32.35 | 52.06 | US 52 in Manchester | US 62 in New Market Township | 1923 | current | ||
 SR 137 | 3.56 | 5.73 | SR 136 in Cherry Fork | SR 247 in Wayne Township | 1923 | current | ||
 SR 138 | 60.37 | 97.16 | SR 134 in Clay Township | US 22 in Wayne Township | 1923 | current | ||
 SR 139 | 33.99 | 54.70 | US 52 in New Boston | SR 93 in Jackson | 1923 | current | ||
 SR 140 | 20.74 | 33.38 | US 52 in Portsmouth | SR 93 in Jefferson Township | 1923 | current | ||
 SR 141 | 44.97 | 72.37 | US 52 in Ironton | SR 7 in Gallipolis | 1923 | current | ||
 SR 142 | — | — | Kerr | Hamden | 1923 | 1926 | ||
 SR 142 | 13.66 | 21.98 | US 42/SR 38/SR 56/SR 665 in London | I-70 in Jefferson Township | 1926 | current | ||
 SR 143 | 20.15 | 32.43 | SR 7 in Salisbury Township | US 50 in Lee Township | 1923 | current | ||
 SR 144 | 14.61 | 23.51 | SR 124 in Troy Township | SR 329 in Rome Township | 1923 | current | ||
 SR 145 | 46.14 | 74.26 | SR 821 in Lower Salem | SR 148 in Washington Township | 1923 | current | ||
 SR 146 | 65.25 | 105.01 | SR 16 in Hanover Township | SR 78 in Summerfield | 1923 | current | ||
 SR 147 | 58.19 | 93.65 | SR 78 in Center Township | SR 7 in Pultney Township | 1923 | current | ||
 SR 148 | 26.97 | 43.40 | SR 800 in Warren Township | SR 7 in Powhatan Point | 1923 | current | ||
 SR 149 | 36.09 | 58.08 | SR 7 in Bellaire | SR 9 in Athens Township | 1923 | current | ||
 SR 150 | 13.30 | 21.40 | US 250 in Mount Pleasant Township | SR 7 in Rayland | 1923 | current | ||
 SR 151 | 43.06 | 69.30 | US 250 in Monroe Township | SR 7 in Steubenville Township | 1923 | current | ||
 SR 152 | 20.20 | 32.51 | SR 150 in Dillonvale | SR 151 in Smithfield | 1923 | current | ||
| SR 152 | 6.18 | 9.95 | US 22 in Bloomingdale | SR 7 in Empire | 1943 | current | ||
 SR 153 | — | — | Wellsville | West Point | 1923 | 1931 | ||
 SR 153 | 14.69 | 23.64 | SR 43 in Canton | SR 183 in Washington Township | 1932 | current | ||
 SR 154 | 16.27 | 26.18 | US 30/SR 45/SR 164/SR 517 in Lisbon | PA 251 at Pennsylvania state line in Middleton Township | 1923 | current | ||
 SR 155 | — | — | Sandyville | Minerva | 1923 | 1926 | ||
 SR 155 | 7.45 | 11.99 | SR 93 in Shawnee | SR 13 in Corning | 1926 | current | ||
 SR 156 | — | — | Nashport | Muskingum Township | 1923 | 1962 | ||
 SR 157 | — | — | Union Township | Union Township | 1923 | 1958 | ||
 SR 158 | 18.11 | 29.15 | US 22/SR 37/SR 188 in Lancaster | US 40 in Kirkersville | 1923 | current | ||
 SR 159 | 30.91 | 49.74 | US 50/US 23 Bus./SR 104 in Chillicothe | US 22 in Hocking Township | 1923 | current | ||
 SR 160 | — | — | London | Delaware | 1923 | 1926 | ||
 SR 160 | 38.82 | 62.47 | SR 7 in Gallipolis | SR 93 in Hamden | 1926 | current | ||
 SR 161 | 57.80 | 93.02 | SR 29 in Mutual | SR 37 in St. Albans Township | 1923 | current | ||
 SR 162 | 83.32 | 134.09 | SR 18/SR 67 in Republic | SR 18 in Akron | 1923 | current | ||
 SR 163 | 46.27 | 74.46 | US 20/US 23 in Troy Township | Hartshorn Road in Danbury Township | 1923 | current | ||
 SR 164 | 63.46 | 102.13 | SR 212 in Orange Township | Western Reserve Road/I-680 in Beaver Township | 1923 | current | ||
 SR 165 | 32.31 | 52.00 | US 62/SR 173 on Smith–Knox township line | Taggart Road in Unity Township | 1923 | current | ||
 SR 166 | 11.40 | 18.35 | US 6 in Hambden Township | SR 534 in Trumbull Township | 1923 | current | ||
 SR 167 | 14.08 | 22.66 | SR 46/SR 307 in Jefferson | PA 198 at Pennsylvania state line in Pierpont Township | 1923 | current | ||
 SR 168 | 8.45 | 13.60 | US 422/SR 88/SR 528 in Parkman Township | SR 87/SR 700 in Burton | 1923 | current | ||
 SR 169 | 6.76 | 10.88 | US 422 in Weathersfield Township | US 422/SR 45 in Warren | 1923 | current | ||
 SR 170 | 36.54 | 58.81 | US 30/SR 7/SR 11 in St. Clair Township | US 62 in Youngstown | 1923 | current | ||
 SR 171 | 11.76 | 18.93 | SR 183 in Waynesburg | SR 9 in Washington Township | 1923 | current | ||
 SR 172 | 46.98 | 75.61 | US 30 in Sugar Creek Township | US 30 in Center Township | 1923 | current | ||
 SR 173 | 20.98 | 33.76 | SR 44 on Nimishillen–Marlboro township line | SR 9/SR 14 in Salem | 1923 | current | ||
 SR 174 | 9.56 | 15.39 | Old Mill Road in Gates Mills | US 20/SR 640 in Willoughby | 1923 | current | ||
 SR 175 | 15.70 | 25.27 | SR 43 on Bedford Heights–Solon city line | SR 283 in Euclid | 1923 | current | ||
 SR 176 | 19.42 | 31.25 | I-77/SR 21 in Richfield | I-71 in Cleveland | 1923 | current | ||
 SR 177 | — | — | East Union Township | Orrville | 1923 | 1926 | ||
| SR 177 | — | — | Washington Township | Washington Township | 1926 | 1926 | ||
 SR 177 | — | — | Goshen Township | New Philadelphia | 1926 | 1932 | ||
 SR 177 | 23.58 | 37.95 | SR 4/SR 129 in Hamilton | SR 227 at Indiana state line in Dixon Township | 1938 | current | ||
 SR 178 | — | — | Franklin Township | Plymouth | 1923 | 1959 | ||
 SR 179 | 15.53 | 24.99 | SR 39/SR 60 in Washington Township | SR 60 in Hayesville | 1923 | current | ||
 SR 180 | — | — | Savannah | Fitchville | 1923 | 1926 | ||
 SR 180 | 29.55 | 47.56 | SR 159 in Green Township | US 33 in Falls Township | 1926 | current | ||
 SR 181 | 4.47 | 7.19 | SR 61 in Crestline | SR 309 in Springfield Township | 1923 | current | ||
 SR 182 | 7.97 | 12.83 | Upper Sandusky | Nevada | 1923 | c. 2005 | ||
 SR 183 | — | — | Toledo | Toledo | 1923 | 1951 | ||
 SR 183 | 43.38 | 69.81 | SR 800 in Sandy Township | SR 14 in Edinburg Township | 1962 | current | ||
 SR 184 | — | — | Grand Rapids | Tontogany | 1923 | 1941 | ||
 SR 184 | 10.14 | 16.32 | US 23/US 223/SR 51 in Sylvania | I-75 in Toledo | 1969 | current | ||
 SR 185 | — | — | McClure | McClure | 1923 | 1926 | ||
 SR 185 | — | — | Old Fort | Bellevue | 1926 | 1937 | ||
 SR 185 | 21.74 | 34.99 | US 127 in York Township | US 36 in Piqua | 1940 | current | ||
 SR 186 | 3.77 | 6.07 | US 224/SR 15 in Liberty Township | SR 235/SR 613 in McComb | 1923 | current | ||
 SR 187 | — | — | Leipsic | McComp | 1923 | 1930 | ||
 SR 187 | 8.22 | 13.23 | SR 56 in Somerford Township | SR 29 in Goshen Township | 1931 | current | ||
 SR 188 | — | — | Greensburg Township | Holgate | 1923 | 1926 | ||
 SR 188 | 39.04 | 62.83 | US 22/SR 56 in Circleville | SR 204 in Thornville | 1926 | current | ||
 SR 189 | 11.58 | 18.64 | US 224/SR 66 in Ottoville | SR 12/SR 115 in Sugar Creek Township | 1923 | current | ||
 SR 190 | 8.93 | 14.37 | SR 66/SR 697 in Delphos | US 224 in Jackson Township | 1923 | current | ||
 SR 191 | 10.88 | 17.51 | US 6 in West Unity | US 20A/US 127 in West Unity | 1923 | current | ||
 SR 192 | — | — | Bryan | Springfield Township | 1923 | 1955 | ||
 SR 193 | — | — | Hicksville | Hicksville | 1923 | 1938 | ||
 SR 193 | 57.95 | 93.26 | I-680 in Youngstown | SR 531 in North Kingsville | 1969 | current | ||
 SR 194 | — | — | Payne | Paulding | 1923 | 1926 | ||
| SR 194 | — | — | Chatford | Willard | 1926 | 1969 | ||
 SR 195 | 3.59 | 5.78 | CR 65/CR 110 in Marion Township | SR 309 in Marion Township | 1923 | current | ||
 SR 196 | 10.21 | 16.43 | US 33/SR 385 in Goshen Township | SR 117 in Auglaize Township | 1923 | current | ||
 SR 197 | 25.27 | 40.67 | US 127/SR 29/SR 703 in Celina | SR 198 in Moulton Township | 1923 | current | ||
 SR 198 | 12.52 | 20.15 | US 33/SR 67/SR 501 in Wapakoneta | SR 117 in Amanda Township | 1923 | current | ||
 SR 199 | — | — | Dawn | Dawn | 1923 | 1923 | ||
 SR 199 | 62.16 | 100.04 | US 23 in Pitt Township | US 20/SR 795 in Perrysburg | 1924 | current | ||
 SR 200 | — | — | Liberty Township | Neave Township | 1923 | 1931 | ||
| SR 200 | — | — | LaGrange | Belden | 1932 | 1936 | ||
| SR 200 | — | — | Medina | Parma | 1938 | 1938 | ||
 SR 201 | 21.69 | 34.91 | SR 4/SR 202 in Dayton | SR 55 in Lostcreek Township | 1923 | current | ||
 SR 202 | 20.06 | 32.28 | SR 4/SR 201 in Dayton | SR 55 in Troy | 1923 | current | ||
 SR 203 | 22.10 | 35.57 | SR 37 in Radnor Township | SR 309 in Big Island Township | 1923 | current | ||
 SR 204 | 37.79 | 60.82 | SR 256 in Pickerington | US 22 in Madison Township | 1923 | current | ||
 SR 205 | 6.94 | 11.17 | US 62/SR 514 in Danville | SR 3 in Brown Township | 1923 | current | ||
 SR 206 | 15.13 | 24.35 | SR 541 in Perry Township | US 62 in Richland Township | 1923 | current | ||
 SR 207 | — | — | Hanover | Fallsbury Township | 1923 | 1937 | ||
 SR 207 | 31.27 | 50.32 | SR 159 near Chillicothe | US 62/SR 3/SR 56 in Mount Sterling | 1962 | current | ||
 SR 208 | 11.19 | 18.01 | SR 60 in Dresden | SR 93 in Adamsville | 1923 | current | ||
 SR 209 | 16.71 | 26.89 | SR 83 in Highland Township | I-77/SR 821 in Byesville | 1923 | current | ||
 SR 210 | — | — | Roscoe | Roscoe | 1923 | 1953 | ||
 SR 211 | 1.23 | 1.98 | SR 39 in Dover | SR 800 in Dover | 1923 | current | ||
 SR 212 | 32.09 | 51.64 | US 250 in Sugar Creek Township | SR 151 in Bowerston | 1923 | current | ||
 SR 213 | 18.61 | 29.95 | SR 7 in Island Creek Township | SR 7 in Saline Township | 1923 | current | ||
 SR 214 | — | — | Blaine | Bellaire | 1923 | 1978 | ||
 SR 215 | 4.61 | 7.42 | SR 821 in Noble Township | SR 285 in Center Township | 1923 | current | ||
 SR 216 | 6.56 | 10.56 | SR 78 in Murray City | SR 93 in New Straitsville | 1923 | current | ||
 SR 217 | 17.47 | 28.12 | SR 141 in Lawrence Township | SR 7 in Rome Township | 1923 | current | ||
 SR 218 | 19.56 | 31.48 | SR 217 in Rome Township | SR 7 in Gallipolis Township | 1923 | current | ||
 SR 219 | — | — | Rome Township | Rome Township | 1923 | 1924 | ||
 SR 219 | 37.17 | 59.82 | CR 300N in Washington Township | I-75 in Botkins | 1925 | current | ||
 SR 220 | 14.00 | 22.53 | SR 772 in Pebble Township | SR 32/SR 124 in Seal Township | 1923 | current | ||
 SR 221 | 8.00 | 12.87 | US 52 in Higginsport | SR 125 in Georgetown | 1923 | current | ||
 SR 222 | 29.14 | 46.90 | US 52 in Chilo | US 50 in Stonelick Township | 1923 | current | ||
 SR 223 | — | — | Ross | McGonigle | 1923 | 1926 | ||
 SR 223 | — | — | Holland | Holland | 1926 | 1930 | ||
 SR 224 | — | — | Hamilton | Fairhaven | 1923 | 1933 | ||
 SR 225 | 20.00 | 32.19 | SR 183 in Alliance | SR 5 in Paris Township | 1923 | current | ||
 SR 226 | — | — | Minerva | Minerva | 1923 | 1927 | ||
 SR 226 | 14.84 | 23.88 | SR 3/SR 179 in Washington Township | SR 3 in Wooster Township | 1929 | current | ||
 SR 227 | — | — | Jewett | Jewett | 1923 | 1962 | ||
 SR 228 | 1.30 | 2.09 | SR 19 in Adams Township | SR 101 in Adams Township | 1923 | current | ||
 SR 229 | — | — | Colby | Bellevue | 1923 | 1924 | ||
| SR 229 | — | — | Tiffin | Republic | 1925 | 1926 | ||
 SR 229 | — | — | Bellevue | Strongs Ridge | 1926 | 1929 | ||
 SR 229 | 50.97 | 82.03 | SR 47 in Waldo Township | US 36 in Newcastle Township | 1931 | current | ||
 SR 230 | — | — | Fremont | Fremont | 1923 | 1957 | ||
 SR 230 | — | — | Perrysburg | Perrysburg | 1962 | 1971 | ||
 SR 231 | 35.70 | 57.45 | Morral-Kirkpatrick Road in Morral | SR 18/SR 100/SR 101 in Tiffin | 1923 | current | ||
 SR 232 | — | — | Berea | Kamms | 1923 | 1928 | ||
 SR 232 | 11.46 | 18.44 | US 52 in Monroe Township | SR 125 in Bethel | 1930 | current | ||
 SR 233 | 12.25 | 19.71 | SR 93/SR 279 in Oak Hill | SR 141 in Perry Township | 1924 | current | ||
 SR 234 | — | — | West Lafayette | Shanesville | 1924 | 1929 | ||
| SR 234 | — | — | Warsaw | Shreve | 1930 | 1937 | ||
 SR 235 | 133.18 | 214.33 | US 68 in Xenia Township | SR 65 in Washington Township | 1924 | current | ||
 SR 236 | 8.05 | 12.96 | SR 21 in Massillon | SR 93 in Franklin Township | 1924 | current | ||
 SR 237 | — | — | Buckeye Lake | Hebron | 1924 | 1932 | ||
 SR 237 | 13.79 | 22.19 | SR 82 in Strongsville | US 6/US 20/SR 2 in Lakewood | 1935 | current | ||
 SR 238 | 1.04 | 1.67 | US 62/SR 3 near Washington Court House | SR 38 in Bloomingburg | 1924 | c. 2014 | ||
 SR 239 | 1.22 | 1.96 | US 52 in Washington Township | SR 73/SR 104 in Washington Township | 1924 | current | ||
 SR 240 | — | — | Lucasville | Lucasville | 1924 | 1938 | ||
 SR 240 | — | — | East Harbor State Park | East Harbor State Park | 1948 | 1967 | ||
 SR 241 | 50.36 | 81.05 | US 62/SR 39 in Millersburg | SR 18 in Akron | 1924 | current | ||
 SR 242 | 3.67 | 5.91 | US 127 in Richland Township | SR 121 in Wayne Township | 1924 | 2013 | ||
 SR 243 | 18.39 | 29.60 | US 52 in Coal Grove | SR 7 in Union Township | 1925 | current | ||
 SR 244 | — | — | Newport | Newport | 1925 | 1961 | ||
 SR 245 | — | — | Bloomfield | Matamoras | 1925 | 1934 | ||
 SR 245 | 36.03 | 57.98 | SR 29 in Adams Township | US 33/US 36/SR 4 in Paris Township | 1962 | current | ||
 SR 246 | 6.07 | 9.77 | US 20 in Toledo | SR 51 in Toledo | 1925 | current | ||
 SR 247 | 36.35 | 58.50 | Ohio River in Monroe Township | SR 73 in Hillsboro | 1925 | current | ||
 SR 248 | 9.15 | 14.73 | SR 7 in Chester Township | SR 124 in Olive Township | 1925 | current | ||
 SR 249 | — | — | Ney | Ney | 1925 | 1926 | ||
 SR 249 | 14.45 | 23.26 | CR 49 in Milford Township | SR 15 in Ney | 1926 | current | ||
 SR 250 | — | — | Lakeville | Burnetts Corners | 1925 | 1928 | ||
 SR 251 | 4.81 | 7.74 | US 50 in Perry Township | US 68 in Jefferson Township | 1925 | current | ||
 SR 252 | 23.04 | 37.08 | SR 18/SR 57 in York Township | US 6 in Bay Village | 1925 | current | ||
 SR 253 | 0.56 | 0.90 | KY 10 at Kentucky state line in Green Township | US 52 in Green Township | 1989 | current | ||
 SR 254 | 17.15 | 27.60 | SR 57 in Sheffield Township | US 6/US 20/SR 2 in Lakewood | 1929 | current | ||
 SR 255 | — | — | Ada | Mount Cory | 1926 | 1926 | ||
 SR 255 | — | — | New Philadelphia | Reeds Run | 1926 | 1932 | ||
 SR 255 | 18.08 | 29.10 | SR 800 in Center Township | SR 7 in Lee Township | 1935 | current | ||
 SR 256 | — | — | Toledo | Toledo | 1926 | 1926 | ||
 SR 256 | 25.99 | 41.83 | US 40 in Reynoldsburg | SR 13 in Thorn Township | 1926 | current | ||
 SR 257 | 26.19 | 42.15 | US 33/SR 47 in Dublin | SR 47 in Prospect | 1926 | current | ||
 SR 258 | 25.62 | 41.23 | US 36 in Newcomerstown | SR 800 in Rush Township | 1926 | current | ||
 SR 259 | 4.41 | 7.10 | SR 416 in Goshen Township | SR 39 in New Philadelphia | 1926 | current | ||
 SR 260 | 36.67 | 59.01 | SR 7 in Matamoras | SR 78 in Stock Township | 1926 | current | ||
 SR 261 | 25.88 | 41.65 | SR 94 in Wadsworth | SR 59 in Franklin Township | 1926 | current | ||
 SR 262 | — | — | Osceola | Melmore | 1926 | 1967 | ||
 SR 263 | — | — | East Liverpool | East Palestine | 1926 | 1926 | ||
 SR 263 | — | — | Sylvania | Toledo | 1926 | 1939 | ||
 SR 264 | 16.58 | 26.68 | US 50 in Cleves | US 27/US 42/US 52/US 127 in Cincinnati | 1926 | current | ||
 SR 265 | — | — | Beverly | Reinersville | 1926 | 1926 | ||
 SR 265 | 18.36 | 29.55 | US 40 in Center Township | SR 147 in Warren Township | 1926 | current | ||
 SR 266 | 13.86 | 22.31 | SR 377 in Penn Township | SR 60 in Center Township | 1926 | current | ||
 SR 267 | 5.39 | 8.67 | SR 7/SR 39 in East Liverpool | US 30/SR 7/SR 11 in St. Clair Township | 1926 | current | ||
 SR 268 | — | — | Bridgetown | Cheviot | 1928 | 1975 | ||
 SR 269 | 28.08 | 45.19 | SR 4 on Sherman–Thompson township line | East Harbor State Park entrance in Danbury Township | 1931 | current | ||
 SR 270 | — | — | Perrysburg | Perrysburg | 1928 | 1962 | ||
 SR 271 | — | — | Montpelier | Bridgewater Township | 1930 | 1931 | ||
 SR 271 | — | — | Martinsburg | Birmingham | 1932 | 1962 | ||
 SR 272 | — | — | Canton | Canton | 1930 | 1961 | ||
 SR 273 | 19.80 | 31.87 | Maple Lane in Richland Township | SR 31 in Mount Victory | 1930 | current | ||
 SR 274 | 52.70 | 84.81 | US 127 in Marion Township | SR 273 in Rushcreek Township | 1930 | current | ||
 SR 275 | — | — | Rosewood | Marysville | 1930 | 1962 | ||
 SR 276 | 6.46 | 10.40 | SR 133 in Williamsburg | US 50/SR 132 in Owensville | 1930 | current | ||
 SR 277 | — | — | Chillicothe | Mount Sterling | 1930 | 1962 | ||
 SR 278 | 27.61 | 44.43 | US 50 in Madison Township | SR 595 in Green Township | 1930 | current | ||
 SR 279 | 20.11 | 32.36 | SR 139 in Hamilton Township | US 35 in Raccoon Township | 1930 | current | ||
 SR 280 | — | — | Amesville | Trimble | 1930 | 1962 | ||
 SR 281 | 50.71 | 81.61 | US 24 in Defiance | US 6 on Montgomery–Freedom township line | 1930 | current | ||
 SR 282 | 3.05 | 4.91 | SR 305 in Nelson Township | US 422 in Parkman Township | 1930 | current | ||
 SR 283 | — | — | Holland | Holland | 1931 | 1931 | ||
 SR 283 | 29.46 | 47.41 | US 6 in Cleveland | US 20 in Painesville | 1932 | current | ||
 SR 284 | 17.42 | 28.03 | SR 83 in Bristol Township | SR 146 in Salt Creek Township | 1930 | current | ||
 SR 285 | 27.93 | 44.95 | SR 821 in Caldwell | US 22 in Madison Township | 1931 | current | ||
 SR 286 | 9.97 | 16.05 | US 50 in Jackson Township | SR 134 in Clay Township | 1931 | current | ||
 SR 287 | 13.69 | 22.03 | SR 245 in Monroe Township | US 33/SR 739 in Allen Township | 1931 | current | ||
 SR 288 | — | — | Willowick | Willoughby | 1931 | 1940 | ||
 SR 288 | 6.82 | 10.98 | SR 309 in Washington Township | SR 97 in North Bloomfield Township | 1953 | current | ||
 SR 289 | — | — | New Haven | New Haven | 1931 | 1940 | ||
 SR 289 | 9.93 | 15.98 | US 422/SR 193 in Youngstown | Pennsylvania state line in Poland Township | 1950 | current | ||
 SR 290 | — | — | Salem Township | Wayne Township | 1932 | 1962 | ||
 SR 291 | — | — | Liberty Township | Liberty Township | 1932 | 1945 | ||
 SR 291 | 4.14 | 6.66 | Fowles Road in Middleburg Heights | SR 17 on Brook Park–Cleveland city line | 1951 | current | ||
 SR 292 | 26.49 | 42.63 | US 33 in Jefferson Township | SR 31 in Buck Township | 1932 | current | ||
 SR 293 | 6.28 | 10.11 | SR 53 in Jackson Township | Cass Street (CR 47) in Wharton | 1932 | current | ||
 SR 294 | 24.20 | 38.95 | SR 37 in Jackson Township | SR 98 in Dallas Township | 1932 | current | ||
 SR 295 | 24.00 | 38.62 | SR 65 in Grand Rapids | Silberhorn Highway in Berkey | 1932 | current | ||
 SR 296 | — | — | Reedtown | Bellevue | 1932 | 1936 | ||
 SR 296 | 10.52 | 16.93 | SR 29 in Salem Township | SR 245 in Wayne Township | 1962 | current | ||
 SR 297 | — | — | Wayne | Bradner | 1932 | 1938 | ||
 SR 297 | 2.53 | 4.07 | US 30/US 62 in Canton | SR 172 in Canton | 1977 | current | ||
 SR 298 | — | — | Chatfield | Willard | 1932 | 1967 | ||
 SR 299 | — | — | Milan | Huron | 1932 | 1966 | ||
 SR 300 | 6.33 | 10.19 | US 6 in Madison Township | US 20 in Woodville Township | 1932 | current | ||
 SR 301 | 45.30 | 72.90 | SR 302 in Chester Township | US 6 in Sheffield Lake | 1932 | current | ||
 SR 302 | 28.44 | 45.77 | SR 83 in Wooster | US 250/SR 60 in Savannah | 1932 | current | ||
 SR 303 | 75.66 | 121.76 | US 20 in Wakeman | SR 82 in Braceville Township | 1932 | current | ||
 SR 304 | 9.95 | 16.01 | US 422 in Girard | PA 318 at Pennsylvania state line in Hubbard Township | 1932 | current | ||
 SR 305 | 33.90 | 54.56 | SR 82/SR 700 in Hiram | PA 718 at Pennsylvania state line in Hartford Township | 1932 | current | ||
 SR 306 | 27.41 | 44.11 | SR 43 in Aurora | SR 283 in Mentor | 1932 | current | ||
 SR 307 | 22.99 | 37.00 | SR 528 in Madison Township | SR 193 in Dorset Township | 1933 | current | ||
 SR 308 | 3.00 | 4.83 | SR 229 in Gambier | US 36 in Monroe Township | 1932 | current | ||
 SR 309 | — | — | Tunnel Hill | Roscoe | 1932 | 1934 | ||
 SR 309 | 103.54 | 166.63 | US 30 in Marion Township | US 30 in Mansfield | 1973 | current | ||
 SR 310 | 13.97 | 22.48 | SR 204 in Liberty Township | SR 37 in Liberty Township | 1932 | current | ||
 SR 311 | — | — | Brookville | Arlington | 1932 | 1964 | ||
 SR 312 | 9.14 | 14.71 | SR 93 in Falls Township | SR 664 in Rush Creek Township | 1932 | current | ||
 SR 313 | 34.35 | 55.28 | SR 146 in Salt Creek Township | SR 147 in Beaver Township | 1932 | current | ||
 SR 314 | 38.75 | 62.36 | US 36/SR 3 in Centerburg | SR 61 in Sharon Township | 1932 | current | ||
 SR 315 | 22.48 | 36.18 | I-70/I-71 in Columbus | US 23 in Delaware Township | 1933 | current | ||
 SR 316 | 14.05 | 22.61 | SR 56 in Monroe Township | SR 752 in Ashville | 1931 | current | ||
 SR 317 | 18.89 | 30.40 | US 23/SR 665 in Hamilton Township | US 62 in Gahanna | 1932 | current | ||
 SR 318 | — | — | Jackson Center | Uniopolis | 1932 | 1936 | ||
 SR 319 | 0.56 | 0.90 | Washington Street in Burkettsville | SR 118 on Allen–Granville township line | 1932 | current | ||
 SR 320 | 3.12 | 5.02 | US 35 in Jackson Township | SR 121 in New Paris | 1932 | current | ||
 SR 321 | 9.07 | 14.60 | SR 134 in Clay Township | US 62 on White Oak–Concord township line | 1932 | current | ||
 SR 323 | 18.66 | 30.03 | SR 41 in South Solon | SR 56 in Pleasant Township | 1932 | current | ||
 SR 324 | 4.44 | 7.15 | SR 160 in Clinton Township | SR 93 in Clinton Township | 1932 | current | ||
 SR 325 | 24.07 | 38.74 | SR 141 in Perry Township | SR 124 in Salem Township | 1932 | current | ||
| SR 326 | 1.2 | 1.9 | Holland | Holland | 1932 | 1934 | ||
 SR 326 | 2.1 | 3.4 | Marietta | Marietta | 1935 | 1967 | ||
 SR 327 | 47.35 | 76.20 | US 35 in Bloomfield Township | SR 180 in Adelphi | 1933 | current | ||
 SR 328 | 22.72 | 36.56 | SR 93 in Elk Township | US 33 in Logan | 1932 | current | ||
 SR 329 | 23.80 | 38.30 | US 50/SR 32 in Rome Township | SR 13 in Trimble | 1932 | current | ||
 SR 330 | 3.00 | 4.83 | SR 15 in Amanda Township | SR 568 in Biglick Township | 1932 | current | ||
 SR 331 | 18.09 | 29.11 | US 22 in Moorefield Township | US 40 in Richland Township | 1932 | current | ||
 SR 332 | 12.89 | 20.74 | SR 151 in North Township | SR 9/SR 39/SR 43 in Carrollton | 1933 | current | ||
 SR 333 | — | — | Dillonvale | Smithfield | 1932 | 1937 | ||
 SR 333 | 3.00 | 4.83 | Sylvania | Sylvania | 1946 | 1962 | ||
 SR 334 | — | — | Leesville | Amsterdam | 1932 | 1937 | ||
 SR 334 | 4.24 | 6.82 | US 68 in German Township | SR 4 in Moorefield Township | 1969 | current | ||
 SR 335 | 42.41 | 68.25 | US 52 in Portsmouth | US 23/SR 104/SR 220 in Waverly | 1933 | current | ||
 SR 336 | — | — | Cecil | Emmet | 1932 | 1945 | ||
 SR 337 | — | — | Antiquity | Racine | 1932 | 1936 | ||
 SR 338 | 2.32 | 3.73 | US 33 near Racine | SR 124 near Racine | 1932 | 2012 | ||
 SR 339 | 34.57 | 55.64 | SR 618 in Belpre Township | SR 821 in Jefferson Township | 1933 | current | ||
 SR 340 | 13.18 | 21.21 | SR 284 in Meigs Township | SR 821 in Belle Valley | 1933 | current | ||
 SR 341 | — | — | Beach City | Beach City | 1933 | 1941 | ||
 SR 342 | 5.27 | 8.48 | SR 258 in Perry Township | SR 800 in Freeport | 1933 | current | ||
 SR 343 | 3.37 | 5.42 | US 68 in Yellow Springs | SR 72 in Clifton | 1933 | current | ||
 SR 344 | 10.12 | 16.29 | SR 9/SR 14 in Salem | SR 164 in Columbiana | 1935 | current | ||
 SR 345 | 11.74 | 18.89 | SR 13/SR 37 in New Lexington | US 22 in Newton Township | 1935 | current | ||
 SR 346 | 20.77 | 33.43 | Wellston | Albany | 1935 | 1983 | ||
 SR 347 | 20.96 | 33.73 | SR 287 in Zane Township | SR 37 in Leesburg Township | 1935 | current | ||
 SR 348 | 32.24 | 51.89 | SR 125 in Tiffin Township | US 23/SR 728 in Valley Township | 1935 | current | ||
 SR 349 | 2.37 | 3.81 | SR 93 in Wellston | SR 160 in Hamden | 1934 | current | ||
 SR 350 | 27.40 | 44.10 | SR 123 in Turtle Creek Township | SR 28/SR 73 in New Vienna | 1935 | current | ||
 SR 351 | — | — | Marietta | Marietta | 1935 | 1969 | ||
 SR 352 | — | — | Beach City | Bolivar | 1935 | 1938 | ||
 SR 353 | 4.60 | 7.40 | US 62 in Jefferson Township | SR 125 in Byrd Township | 1935 | current | ||
 SR 354 | — | — | New Garden | Lisbon | 1934 | 1938 | ||
 SR 355 | 1.37 | 2.20 | Eaton | Eaton | 1934 | c. 1999 | ||
 SR 356 | 10.74 | 17.28 | US 50 in Knox Township | SR 56 in Waterloo Township | 1934 | current | ||
 SR 357 | 2.35 | 3.78 | West Shore Boulevard in Put-in-Bay Township on South Bass Island | Lake Erie in Put-in-Bay Township on South Bass Island | 1934 | current | ||
 SR 358 | 0.92 | 1.48 | SR 163 in Erie Township | SR 2 in Erie Township | 1934 | current | ||
 SR 359 | 1.02 | 1.64 | Boston Township | Boston Township | 1934 | c. 1988 | ||
 SR 360 | 1.94 | 3.12 | SR 79 in Walnut Township | SR 79 in Buckeye Lake | 1938 | current | ||
 SR 361 | 4.67 | 7.52 | US 23 in Pickaway Township | SR 159 in Pickaway Township | 1934 | current | ||
 SR 362 | 4.56 | 7.34 | SR 66 in Fort Loramie | SR 66 in Minster | 1934 | current | ||
 SR 363 | 1.43 | 2.30 | Lotus Road in McLean Township | SR 119 in Jackson Township | 1934 | current | ||
 SR 364 | 16.73 | 26.92 | SR 705 in Patterson-McLean | SR 29 in Noble Township | 1936 | current | ||
 SR 365 | 0.16 | 0.26 | SR 235/SR 366 in Stokes Township | Indian Lake State Park boat ramp in Stokes Township | 1934 | current | ||
 SR 366 | 9.78 | 15.74 | US 33 in Stokes Township | SR 117 in Richland Township | 1934 | current | ||
 SR 367 | — | — | Russells Point | Russells Point | 1934 | 1937 | ||
 SR 368 | 2.59 | 4.17 | SR 366 in Richland Township | CR 272/CR 286 in Stokes Township | 1934 | current | ||
 SR 369 | 1.45 | 2.33 | SR 4 in Bethel Township | US 40 in Bethel Township | 1934 | current | ||
 SR 370 | 1.21 | 1.95 | John Bryan State Park entrance in Miami Township | SR 343 in Miami Township | 1934 | current | ||
 SR 371 | 0.40 | 0.64 | Shawnee State Park entrance in Union Township | SR 73 in Union Township | 1934 | current | ||
 SR 372 | 0.68 | 1.09 | US 23/SR 104 in Franklin Township | Scioto Trail State Forest boundary in Franklin Township | 1934 | current | ||
 SR 373 | 3.39 | 5.46 | SR 93 in Elizabeth Township | SR 93 in Decatur Township | 1934 | current | ||
 SR 374 | 25.26 | 40.65 | SR 56 in Benton Township | US 33 in Good Hope Township | 1934 | current | ||
 SR 375 | — | — | Marietta | Marietta | 1935 | 1969 | ||
 SR 376 | 24.75 | 39.83 | SR 266 in Windsor Township | SR 60 in Blue Rock Township | 1934 | current | ||
 SR 377 | 18.33 | 29.50 | SR 550 in Bern Township | SR 78 in Penn Township | 1934 | current | ||
 SR 378 | 9.46 | 15.22 | SR 243 in Union Township | SR 141 in Aid Township | 1935 | current | ||
 SR 379 | 14.73 | 23.71 | SR 78 in Seneca Township | SR 147 on Somerset–Beaver township line | 1935 | current | ||
 SR 380 | 18.01 | 28.98 | US 22/SR 3 in Adams Township | US 42/US 68/US 35 Bus. in Xenia | 1935 | current | ||
 SR 381 | — | — | Greenville | Ansonia | 1935 | 1936 | ||
 SR 382 | — | — | Aurora | South Russell | 1935 | 1936 | ||
 SR 383 | 1.50 | 2.41 | CR 60 in Reading Township | SR 13 in Reading Township | 1935 | current | ||
 SR 384 | — | — | Williams Center | Ridgeville Corners | 1935 | 1957 | ||
 SR 385 | 6.30 | 10.14 | US 33/SR 196 in Goshen Township | SR 117 in Roundhead Township | 1935 | current | ||
 SR 386 | — | — | Violet Township | Liberty Township | 1935 | 1936 | ||
 SR 387 | — | — | Sandusky | Sandusky | 1935 | 1962 | ||
 SR 412 | 12.42 | 19.99 | US 20/SR 19 in Riley Township | SR 101 in Townsend Township | 1969 | current | ||
 SR 416 | 14.98 | 24.11 | US 36 in Clay Township | SR 800 in Dover Township | 1969 | current | ||
 SR 420 | 2.89 | 4.65 | US 20/US 23 in Troy Township | I-280/Ohio Turnpike in Lake Township | 1969 | current | ||
 SR 421 | 3.37 | 5.42 | US 42/US 224 in Harrisville Township | US 42/US 224 in Harrisville Township | 1959 | current | ||
 SR 423 | 17.09 | 27.50 | SR 47/SR 98 in Waldo | US 23/SR 231 in Grand Prairie Township | 1969 | current | ||
 SR 424 | 25.77 | 41.47 | US 24 in Defiance (Until 2008) | Napoleon | 1964 | 2012 | ||
 SR 430 | 13.11 | 21.10 | SR 309 in Ontario | SR 603 in Mifflin Township | 1960 | current | ||
 SR 435 | 4.08 | 6.57 | US 35 in Jefferson Township | SR 729 in Jasper Township | 2003 | current | ||
 SR 440 | — | — | Englewood | St. Clairsville | 1959 | 1967 | ||
 SR 444 | 9.03 | 14.53 | SR 4 in Dayton | I-675 on Bath–Mad River township line | 1959 | current | ||
 SR 446 | 1.51 | 2.43 | US 224 in Canfield | SR 46 in Canfield Township | 1984 | current | ||
 SR 450 | 1.06 | 1.71 | Milford Parkway in Union Township | US 50 in Miami Township | 2004 | current | ||
 SR 500 | 13.32 | 21.44 | State Line Road/Paulding Road in Benton Township | SR 111 in Paulding | 1937 | current | ||
 SR 501 | 11.93 | 19.20 | US 33/SR 67/SR 198 in Wapakoneta | SR 117 in Shawnee Township | 1937 | current | ||
 SR 502 | 9.71 | 15.63 | Greenville Pike in Washington Township | SR 49/SR 121/SR 571 in Greenville | 1937 | current | ||
 SR 503 | 40.53 | 65.23 | US 127 in Seven Mile | SR 121 in Wayne Lakes | 1937 | current | ||
 SR 504 | 1.29 | 2.08 | Staunton Township | Staunton Township | 1937 | 1982 | ||
 SR 505 | 10.39 | 16.72 | US 52 in Higginsport | SR 125 in Clark Township | 1937 | current | ||
 SR 506 | 4.34 | 6.98 | SR 124 in Marshall Township | SR 753 in Brush Creek Township | 1937 | current | ||
 SR 507 | 3.09 | 4.97 | US 68 in Salem Township | SR 245 in Salem Township | 1937 | current | ||
 SR 508 | 9.46 | 15.22 | SR 235 in De Graff | US 68 in West Liberty | 1937 | current | ||
 SR 509 | — | — | Carey | McCuthenville | 1937 | 1964 | ||
 SR 510 | 7.03 | 11.31 | SR 101 in Clyde | US 6 in Riley Township | 1937 | current | ||
 SR 511 | 50.27 | 80.90 | SR 39 in Green Township | US 20 in New Russia Township | 1937 | current | ||
 SR 512 | — | — | Newark | Newark | 1937 | 1961 | ||
 SR 513 | 27.19 | 43.76 | SR 146 in Summerfield | US 22 in Madison Township | 1937 | current | ||
 SR 514 | 19.84 | 31.93 | US 62/SR 514 in Danville | SR 229 on Ripley–Clinton township line | 1937 | current | ||
 SR 515 | 5.50 | 8.85 | SR 39 in Walnut Creek Township | US 62 in Paint Township | 1937 | current | ||
 SR 516 | 7.70 | 12.39 | SR 93 in Wayne Township | SR 39 in Dover Township | 1937 | current | ||
 SR 517 | 8.50 | 13.68 | US 30/SR 45/SR 164/SR 154 in Lisbon | SR 7/SR 558 in Fairfield Township | 1937 | current | ||
 SR 518 | 11.10 | 17.86 | SR 644 in Franklin Township | US 30/SR 45 in Madison Township | 1937 | current | ||
 SR 519 | 11.08 | 17.83 | US 22 in Moorefield Township | US 250 in Short Creek Township | 1937 | current | ||
 SR 520 | 13.47 | 21.68 | SR 514 in Knox Township | US 62 in Killbuck Township | 1937 | current | ||
 SR 521 | 13.62 | 21.92 | SR 37 in Delaware | SR 656 in Porter Township | 1937 | current | ||
 SR 522 | — | — | Thompson Township | Trumbull | 1937 | 1939 | ||
 SR 522 | 16.58 | 26.68 | US 52 in Porter Township | SR 93 in Elizabeth Township | 1947 | current | ||
 SR 523 | 3.79 | 6.10 | SR 19 in Rice Township | SR 53 in Rice Township | 1939 | current | ||
 SR 524 | — | — | Simons | North Richmond | 1937 | 1941 | ||
 SR 524 | 8.10 | 13.04 | SR 164 in Bergholz | SR 39 in Fox Township | 1947 | current | ||
 SR 526 | — | — | Akron | Mogadore | 1937 | 1979 | ||
 SR 527 | — | — | Ghent | Kent | 1937 | 1941 | ||
 SR 527 | 0.56 | 0.90 | WV 527 at West Virginia state line in Chesapeake | SR 7 in Chesapeake | 1970 | current | ||
 SR 528 | 30.36 | 48.86 | US 422/SR 88/SR 528 in Parkman Township | US 20 in North Madison | 1937 | current | ||
 SR 529 | 17.61 | 28.34 | SR 95 in Marion | SR 61 in Lincoln Township | 1939 | current | ||
 SR 530 | 7.86 | 12.65 | SR 60 in Lowell | SR 821 in Salem Township | 1937 | current | ||
 SR 531 | 22.72 | 36.56 | SR 534 in Geneva-on-the-Lake | SR 7 in Conneaut | 1937 | current | ||
 SR 532 | 3.68 | 5.92 | US 224 in Springfield–Portage township line | I-76 in Tallmadge | 1937 | current | ||
 SR 533 | 1.80 | 2.90 | SR 540 in Jefferson Township | SR 47 in Jefferson Township | 1937 | 2014 | ||
 SR 534 | 69.31 | 111.54 | US 62/SR 173 on Goshen–Butler township line | SR 531 in Geneva-on-the-Lake | 1937 | current | ||
 SR 535 | 4.85 | 7.81 | SR 283 in Painesville | US 20 in Painesville Township | 1937 | current | ||
 SR 536 | 12.63 | 20.33 | WV 7 at West Virginia state line in Ohio Township | SR 78 in Adams Township | 1937 | current | ||
 SR 537 | 4.98 | 8.01 | SR 260 in Bethel Township | SR 26 in Washington Township | 1937 | current | ||
 SR 538 | — | — | Pierpont Township | Pierpont Township | 1937 | 1938 | ||
 SR 539 | — | — | Manchester Township | Manchester Township | 1937 | 1959 | ||
 SR 539 | 13.43 | 21.61 | SR 302 in Chester Township | SR 301 in West Salem | 1964 | current | ||
 SR 540 | 8.72 | 14.03 | US 68/SR 47 in Bellefontaine | SR 292 in Perry Township | 1937 | current | ||
 SR 541 | — | — | Mentor Township | Mentor Township | 1937 | 1942 | ||
 SR 541 | 52.43 | 84.38 | US 62/SR 568 in Martinsburg | I-77 in Liberty Township | 1962 | current | ||
 SR 542 | 15.81 | 25.44 | SR 212 in Monroe Township | SR 183 in Magnolia | 1937 | current | ||
 SR 543 | — | — | Springcreek Township | Orange Township | 1937 | 1959 | ||
 SR 544 | — | — | Sharon Township | Sharon Township | 1937 | 1959 | ||
 SR 545 | 16.94 | 27.26 | SR 39 in Mansfield | US 250/SR 60 in Savannah | 1937 | current | ||
 SR 546 | 11.43 | 18.39 | SR 13 in Middlebury Township | US 42/SR 97 in Lexington | 1937 | current | ||
 SR 547 | 8.18 | 13.16 | SR 269 in Sherman Township | US 20/SR 18 in Monroeville | 1937 | current | ||
 SR 548 | — | — | Mount Eaton | Wadsworth | 1937 | 1967 | ||
 SR 549 | — | — | Mohicanville | Wooster | 1937 | 1938 | ||
 SR 550 | — | — | Pebble Township | Waverly | 1937 | 1946 | ||
 SR 550 | 40.58 | 65.31 | US 33 in Athens Township | SR 7 in Warren Township | 1976 | current | ||
 SR 551 | 2.87 | 4.62 | SR 220 in Pee Pee Township | SR 104 in Pee Pee Township | 1937 | current | ||
 SR 552 | 1.75 | 2.82 | SR 220 in Pee Pee Township | SR 104 in Pee Pee Township | 1937 | current | ||
 SR 553 | 2.34 | 3.77 | SR 7 in Crown City | SR 218 in Guyan Township | 1937 | current | ||
 SR 554 | 20.23 | 32.56 | SR 325 in Raccoon Township | SR 7 in Cheshire | 1937 | current | ||
 SR 555 | 62.36 | 100.36 | US 50/SR 7/SR 32 in Belpre Township | SR 60 in Wayne Township | 1937 | current | ||
 SR 556 | 13.24 | 21.31 | SR 145 in Beallsville | SR 7 in Clarington | 1937 | current | ||
 SR 557 | 10.19 | 16.40 | SR 643 in Clark Township | US 62/SR 39 in Berlin Township | 1937 | current | ||
 SR 558 | 15.71 | 25.28 | SR 45 in Salem Township | SR 46/SR 170 in East Palestine | 1938 | current | ||
 SR 559 | 16.64 | 26.78 | SR 4/SR 29 in Mechanicsburg | SR 287 in Zane Township | 1937 | current | ||
 SR 560 | 9.94 | 16.00 | SR 55 in Mad River Township | SR 29 in Concord Township | 1937 | current | ||
 SR 561 | 7.29 | 11.73 | US 50/SR 32/SR 125 in Cincinnati | Vine Street/Seymour Street in Cincinnati | 1938 | current | ||
 SR 562 | 3.43 | 5.52 | I-75 in Cincinnati | I-71 in Cincinnati | 1938 | current | ||
 SR 563 | — | — | Dexter City | Middleburg | 1937 | 1964 | ||
 SR 564 | 13.48 | 21.69 | SR 78 in Caldwell | SR 145 in Jefferson Township | 1937 | current | ||
 SR 565 | 6.98 | 11.23 | SR 145 in Elk Township | SR 260 in Bethel Township | 1937 | current | ||
 SR 566 | 4.80 | 7.72 | SR 147 in Seneca Township | SR 285 in Wayne Township | 1937 | current | ||
 SR 567 | — | — | Northwest Township | Pioneer | 1938 | 1955 | ||
 SR 568 | — | — | Sylvania | Washington Township | 1939 | 1951 | ||
 SR 568 | 16.18 | 26.04 | SR 12/SR 37 in Findlay | US 23/SR 103/SR 199 in Carey | 1965 | current | ||
 SR 569 | — | — | Jefferson Township | Madison Township | 1938 | 1955 | ||
 SR 570 | — | — | Providence Township | Waterville Township | 1937 | 1961 | ||
 SR 571 | — | — | Bridgewater Township | Bridgewater Township | 1937 | 1955 | ||
 SR 571 | 50.47 | 81.22 | SR 28 at Indiana state line in Union City | US 40 in Bethel Township | 1962 | current | ||
 SR 572 | — | — | Bailey | Sylvania Township | 1937 | 1945 | ||
 SR 573 | — | — | Tiffin Township | Adams Township | 1939 | 1945 | ||
 SR 574 | 4.35 | 7.00 | SR 566 in Seneca Township | SR 313 in Richland Township | 1947 | current | ||
 SR 575 | 2.60 | 4.18 | Neumans Ferry Dock on Kelleys Island | Division Street on Kelleys Island | 1937 | current | ||
 SR 576 | 20.52 | 33.02 | SR 2 in Center Township | Hillsdale Road in Bridgewater Township | 1937 | current | ||
 SR 577 | — | — | Waterville | Toledo | 1939 | 1951 | ||
 SR 578 | 0.19 | 0.31 | SR 65 in Grand Rapids | US 24 in Providence Township | 1937 | 2012 | ||
 SR 579 | 10.76 | 17.32 | SR 51 in Lake Township | SR 2 in Benton Township | 1937 | current | ||
 SR 580 | — | — | Richland Township | Ridgeville | 1939 | 1957 | ||
 SR 581 | — | — | Toledo | Bono | 1937 | 1939 | ||
 SR 582 | 20.09 | 32.33 | SR 65 in Washington Township | SR 105 in Woodville Township | 1940 | current | ||
 SR 584 | — | — | Salem Township | Bay Township | 1937 | 1957 | ||
 SR 585 | — | — | Kipton | Oberlin | 1937 | 1939 | ||
 SR 585 | 19.91 | 32.04 | SR 3/SR 83 in Wooster | SR 21 in Norton | 1969 | current | ||
 SR 586 | 29.98 | 48.25 | SR 146 in Licking Township | SR 13 in Mount Vernon | 1939 | current | ||
 SR 587 | 12.50 | 20.12 | SR 53 in Tymochtee Township | SR 18 in Fostoria | 1937 | current | ||
 SR 588 | 11.71 | 18.85 | SR 325 in Rio Grande | SR 7 in Gallipolis | 1947 | current | ||
 SR 589 | 16.67 | 26.83 | SR 55 in Casstown | SR 29 in Green Township | 1937 | current | ||
 SR 590 | 25.13 | 40.44 | SR 12 in Bettsville | SR 2 in Benton Township | 1937 | current | ||
 SR 591 | — | — | Springville | Tiffin | 1937 | 1955 | ||
 SR 592 | — | — | Jackson Towhship | Jackson Township | 1937 | 1955 | ||
 SR 595 | 9.18 | 14.77 | US 33 in Green Township | SR 216 in New Straitsville | 1937 | current | ||
 SR 596 | — | — | Hebron | Edgewater Beach | 1937 | 1958 | ||
 SR 598 | 23.43 | 37.71 | SR 19/SR 61/SR 309 in Galion | SR 103 in New Haven Township | 1937 | current | ||
 SR 600 | 9.67 | 15.56 | US 23 in Madison Township | US 20 in Washington Township | 1937 | current | ||
 SR 601 | 5.94 | 9.56 | SR 18 on Norwalk–Townsend township line | SR 113 in Milan | 1938 | current | ||
 SR 602 | 14.47 | 23.29 | SR 19 in Polk Township | SR 103 in New Washington | 1937 | current | ||
 SR 603 | 33.58 | 54.04 | SR 95 in Monroe Township | SR 61/SR 98 in Plymouth | 1938 | current | ||
 SR 604 | 24.04 | 38.69 | US 42 in Jackson Township | SR 94/SR 585 in Chippewa Township | 1937 | current | ||
 SR 605 | 9.38 | 15.10 | US 62 in New Albany | SR 37 in Trenton Township | 1937 | current | ||
 SR 606 | 4.26 | 6.86 | SR 3 in Granger Township | SR 94/SR 303 in Hinckley Township | 1937 | current | ||
 SR 607 | 0.44 | 0.71 | WV 106 at West Virginia state line near Huntington, WV | SR 7 in Proctorville | 1986 | 2007 | ||
| SR 607 | 1.69 | 2.72 | SR 60 in Morgan Township | SR 78 in Morgan Township | 2011 | current | ||
 SR 608 | 19.47 | 31.33 | SR 528 in Middlefield Township | CR 360/CR 412 in Concord Township | 1938 | current | ||
 SR 609 | 2.65 | 4.26 | SR 7 in Hartford Township | CR 182 in Orangeville | 1937 | current | ||
 SR 611 | 11.13 | 17.91 | US 6 in Lorain | SR 254 in Avon | 1937 | current | ||
| SR 612 | 10.1 | 16.3 | SR 82 in Strongsville | SR 10 in Cleveland | 1937 | 1951 | ||
 SR 613 | — | — | Glenwillow | Solon | 1937 | 1945 | ||
 SR 613 | 75.86 | 122.08 | State Line Road on Benton–Harrison township line | US 23/SR 18/SR 199 in Fostoria | 1970 | current | ||
 SR 614 | — | — | Concord Township | Madison | 1937 | 1942 | ||
 SR 615 | 6.87 | 11.06 | SR 306 in Kirtland | SR 283 in Mentor-on-the-Lake | 1937 | current | ||
 SR 616 | 10.48 | 16.87 | SR 170 in Poland | US 62/SR 7/SR 304 in Hubbard | 1939 | current | ||
 SR 617 | 4.74 | 7.63 | SR 165 in Springfield Township | PA 351 at Pennsylvania state line in Springfield Township | 1937 | current | ||
 SR 618 | 7.45 | 11.99 | US 50/SR 7/SR 32 in Belpre Township | SR 7 in Belpre | 1937 | current | ||
 SR 619 | 28.98 | 46.64 | I-76/US 224 in Akron | SR 183 in Alliance | 1937 | current | ||
 SR 621 | 5.98 | 9.62 | US 36 in Keene Township | CR 190 in White Eyes Township | 1941 | current | ||
 SR 622 | — | — | Poland Township | Poland Township | 1937 | 1941 | ||
 SR 623 | — | — | Alliance | Alliance | 1938 | 1941 | ||
 SR 625 | 3.36 | 5.41 | US 224 in Boardman Township | US 62 in Youngstown | 1937 | current | ||
 SR 626 | 3.46 | 5.57 | SR 165 in Beaver Township | SR 7 in Beaver Township | 1937 | current | ||
 SR 627 | — | — | SR 14/US 224 in Deerfield | SR 5 in Paris | 1937 | 1969 | ||
 SR 627 | 4.76 | 7.66 | US 30/US 62 in Perry Township | I-77 in Canton | 1987 | current | ||
 SR 628 | — | — | North Canton | North Canton | 1937 | 1967 | ||
 SR 629 | — | — | Jackson Township | Youngstown | 1937 | 1941 | ||
 SR 630 | 2.56 | 4.12 | SR 170 in New Middletown | PA 317 at Pennsylvania state line in Springfield Township | 1937 | current | ||
 SR 631 | — | — | Valley View | Northfield Center Township | 1937 | 1967 | ||
 SR 632 | — | — | Stow | Stow | 1937 | 1966 | ||
 SR 633 | 0.58 | 0.93 | US 20 in Wickliffe | Lakeland Boulevard in Wickliffe | 1940 | current | ||
 SR 634 | 17.95 | 28.89 | SR 189/SR 190 in Fort Jennings | SR 15 in Monroe Township | 1937 | current | ||
 SR 635 | 15.18 | 24.43 | SR 18 in Bascom | US 6 in Jackson Township | 1937 | current | ||
 SR 636 | — | — | Harrison Township | Tully Township | 1937 | 1942 | ||
 SR 637 | 23.16 | 37.27 | US 224 on Jackson–Hoaglin township line | SR 66 in Brown Township | 1937 | current | ||
 SR 638 | 3.99 | 6.42 | US 68 in McArthur Township | SR 273 in Belle Center | 1937 | current | ||
 SR 640 | 3.35 | 5.39 | SR 283 in Willowick | US 20/SR 174 in Willoughby | 1946 | current | ||
 SR 643 | 16.25 | 26.15 | SR 83 in Keene Township | SR 93 in Clark Township | 1937 | current | ||
 SR 644 | 11.60 | 18.67 | SR 39 in Salineville | US 30/SR 9 in Kensington | 1937 | current | ||
 SR 646 | 28.78 | 46.32 | US 250 in Stock Township | SR 43 in Island Creek Township | 1937 | current | ||
 SR 647 | 9.96 | 16.03 | SR 7 in Martins Ferry | SR 150 in Mount Pleasant | 1939 | current | ||
 SR 650 | 9.28 | 14.93 | US 52 in Hanging Rock | SR 522 in Elizabeth Township | 1955 | current | ||
 SR 651 | 3.99 | 6.42 | SR 643 in Crawford Township | SR 93 in Baltic | 1939 | current | ||
 SR 652 | 0.31 | 0.50 | 12th Street/13th Street in Coal Grove | US 52 in Coal Grove | 2012 | current | ||
 SR 655 | — | — | Key | Diles Bottom | 1939 | 1967 | ||
 SR 656 | 10.07 | 16.21 | SR 61 in Kingston Township | SR 229 in South Bloomfield Township | 1937 | current | ||
 SR 657 | 19.84 | 31.93 | SR 13 in Newton Township | US 36/SR 3 in Hilliar Township | 1937 | current | ||
 SR 658 | 11.07 | 17.82 | SR 209 in Adams Township | SR 541 in Wheeling Township | 1937 | current | ||
 SR 660 | 6.33 | 10.19 | SR 313 in Westland Township | SR 209 in Jackson Township | 1937 | current | ||
 SR 661 | 22.22 | 35.76 | SR 16/SR 37 in Granville Township | SR 13 in Mount Vernon | 1937 | current | ||
 SR 662 | 8.14 | 13.10 | SR 209 in Adams Township | SR 93 in Linton Township | 1937 | current | ||
 SR 663 | — | — | Somerset | Crooksville | 1937 | 1937 | ||
 SR 664 | 37.08 | 59.67 | SR 56 in Benton Township | SR 256 on Richland–Thorn township line | 1937 | current | ||
 SR 665 | 25.64 | 41.26 | US 42/SR 38/SR 56/SR 142 in London | US 23/SR 317 in Hamilton Township | 1937 | current | ||
 SR 666 | 14.17 | 22.80 | SR 60/SR 146 in Zanesville | SR 208 in Madison Township | 1937 | current | ||
 SR 668 | 29.24 | 47.06 | SR 93 in Falls Township | US 40 in Bowling Green Township | 1937 | current | ||
 SR 669 | 32.70 | 52.63 | SR 13 in Reading Township | SR 37/SR 78 in Malta | 1937 | current | ||
 SR 670 | — | — | Senecaville Lake | Salesville | 1937 | 1973 | ||
 SR 671 | 4.58 | 7.37 | SR 327 in Eagle Township | US 50 in Harrison Township | 1939 | current | ||
 SR 672 | 3.11 | 5.01 | SR 146 in Spencer Township | SR 821 in Buffalo Township | 1937 | current | ||
 SR 673 | — | — | Blue Rock | Cumberland | 1937 | 1937 | ||
 SR 674 | 16.01 | 25.77 | US 22 on Washington–Clearcreek township line | US 33 in Canal Winchester | 1937 | current | ||
 SR 675 | — | — | Buchtel | Trimble Township | 1937 | 1962 | ||
 SR 676 | 26.40 | 42.49 | SR 555 in Wesley Township | SR 7 in Marietta | 1937 | current | ||
 SR 677 | 4.78 | 7.69 | US 50 in Elk Township | SR 278 in Zaleski | 1937 | current | ||
 SR 678 | 4.00 | 6.44 | SR 374 in Laurel Township | SR 180 in Laurel Township | 1937 | current | ||
 SR 680 | — | — | Mineral | Reedsville | 1937 | 1962 | ||
 SR 681 | 39.43 | 63.46 | SR 356 in Waterloo Township | SR 124 in Olive Township | 1962 | current | ||
 SR 682 | 7.75 | 12.47 | US 33/US 50/SR 32 in Athens Township | SR 13 in Chauncey | 1937 | current | ||
 SR 683 | 8.22 | 13.23 | SR 93 in Clinton Township | US 50 in Richland Township | 1937 | current | ||
 SR 684 | 3.91 | 6.29 | SR 143 in Scipio Township | SR 681 in Scipio Township | 1937 | current | ||
 SR 685 | 5.24 | 8.43 | SR 78 in Buchtel | SR 13 in Trimble Township | 1937 | current | ||
 SR 686 | — | — | Lawrence Township | Massillon | 1937 | 1941 | ||
 SR 687 | 5.70 | 9.17 | SR 241 in Jackson Township | I-77/US 62 in Canton | 1937 | current | ||
 SR 689 | 7.52 | 12.10 | SR 160 in Wilkesville Township | SR 32 in Columbia Township | 1937 | current | ||
 SR 690 | 5.00 | 8.05 | US 50/SR 32 in Canaan Township | SR 550 in Ames Township | 1937 | current | ||
 SR 691 | 10.29 | 16.56 | SR 56 in Waterloo Township | US 33/SR 78 in Nelsonville | 1938 | current | ||
 SR 692 | 3.19 | 5.13 | SR 692 in Scipio Township | SR 681 in Scipio Township | 1937 | 2013 | ||
 SR 694 | 12.00 | 19.31 | SR 114 in Perry Township | US 224 in Glandorf | 1937 | current | ||
 SR 695 | — | — | Lloydsville | Lloydsville | 1939 | 1939 | ||
 SR 696 | 9.68 | 15.58 | US 30 in Richland Township | SR 12 in Riley Township | 1939 | current | ||
 SR 697 | 7.54 | 12.13 | SR 116 in Ridge Township | SR 66/SR 190 in Delphos | 1938 | current | ||
 SR 698 | 6.44 | 10.36 | SR 103 in Van Buren Township | CR 313 in Eagle Township | 1937 | current | ||
 SR 699 | 2.02 | 3.25 | Kirby | Kirby | 1937 | 1996 | ||
 SR 700 | 16.70 | 26.88 | SR 88 in Freedom Township | SR 87/SR 168 in Burton | 1942 | current | ||
 SR 701 | 8.93 | 14.37 | SR 309 in Marion Township | US 68 on Pleasant–Blanchard township line | 1937 | current | ||
 SR 702 | — | — | SR 235 in Stokes Township, Logan County | Turkeyfoot Point on the Indian Lake shoreline in Stokes Township | 1940 | 1977 | ||
 SR 702 | 0.64 | 1.03 | Brilliant, Ohio | West Virginia state line in Wells Township, Jefferson County | 2023 | current | ||
 SR 703 | 14.92 | 24.01 | SR 219 in Montezuma | SR 29/SR 66/SR 116 in St. Marys | 1937 | current | ||
 SR 704 | — | — | Willshire | Lima | 1937 | 1939 | ||
 SR 705 | 28.80 | 46.35 | SR 49 in Mississinawa Township | SR 29 in Clinton Township | 1937 | current | ||
 SR 706 | 7.44 | 11.97 | SR 29 in Perry Township | SR 235 in Miami Township | 1937 | current | ||
 SR 707 | 19.43 | 31.27 | SR 218 at Indiana state line in Black Creek Township | SR 117 in Union Township | 1937 | current | ||
 SR 708 | 2.32 | 3.73 | SR 235 in Washington Township | Township Road 253 in Washington Township | 1937 | current | ||
 SR 709 | 9.20 | 14.81 | SR 118 in Ohio City | SR 116 on York–Jennings township line | 1938 | current | ||
 SR 710 | 4.62 | 7.44 | SR 161 in Columbus | I-270 in Columbus | 1969 | current | ||
 SR 711 | 3.44 | 5.54 | I-680 in Youngstown | I-80/SR 11 in Liberty Township | 1974 | current | ||
 SR 714 | 3.07 | 4.94 | Union Township | Salem Township | 1937 | 1982 | ||
 SR 715 | 12.40 | 19.96 | US 36 in Union Township | US 36 in Nellie | 1939 | current | ||
 SR 716 | 6.71 | 10.80 | SR 705 in Osgood | SR 274 in Chickasaw | 1937 | current | ||
 SR 718 | 10.62 | 17.09 | SR 721 in Newton Township | SR 55 in Troy | 1937 | current | ||
 SR 719 | 0.61 | 0.98 | US 22/SR 93 on South Zanesville–Zanesville municipal line | SR 555 in Zanesville | 1989 | current | ||
 SR 720 | 8.20 | 13.20 | SR 65 in Clay Township | US 33 in Russells Point | 1937 | current | ||
 SR 721 | 17.86 | 28.74 | SR 49 in Union Township | SR 185 on Adams–Newberry township line | 1937 | current | ||
 SR 722 | 16.74 | 26.94 | SR 121 in Harrison Township | SR 49 in Monroe Township | 1937 | current | ||
 SR 723 | — | — | Harveysburg | New Burlington | 1939 | 1945 | ||
 SR 723 | 0.85 | 1.37 | I-70 in Cambridge Township | US 22/US 40 in Cambridge | 1961 | current | ||
 SR 724 | 4.05 | 6.52 | SR 260 in Stock Township | SR 145 in Franklin Township | 1937 | current | ||
 SR 725 | 48.07 | 77.36 | SR 44 in Israel Township | US 42 in Spring Valley | 1937 | current | ||
 SR 726 | 14.21 | 22.87 | US 127 in Washington Township | SR 121 in New Madison | 1937 | current | ||
 SR 727 | 5.46 | 8.79 | SR 131 in Stonelick Township | SR 133 in Wayne Township | 1937 | current | ||
 SR 728 | 1.93 | 3.11 | US 23/SR 348 in Valley Township | CR 28/CR 180 in Jefferson Township | 1975 | current | ||
 SR 729 | 33.57 | 54.03 | SR 73/SR 350 in Green Township | SR 323 in Stokes Township | 1937 | current | ||
 SR 730 | 11.43 | 18.39 | SR 133 in Marion Township | US 68/SR 134 in Wilmington | 1939 | current | ||
 SR 732 | 30.61 | 49.26 | SR 129 in Reily Township | US 35/US 127/SR 122 in Eaton | 1938 | current | ||
 SR 733 | 2.25 | 3.62 | SR 124/SR 833 in Pomeroy | US 33/SR 7 in Salisbury Township | 2013 | current | ||
 SR 734 | 16.58 | 26.68 | SR 72 in Jamestown | SR 38 in Paint Township | 1937 | current | ||
 SR 735 | 1.41 | 2.27 | US 35 in Gallipolis Township | SR 7 in Addison Township | 1969 | current | ||
 SR 736 | 8.41 | 13.53 | US 42 in Jerome Township | SR 38 in Marysville | 1937 | current | ||
 SR 739 | 35.50 | 57.13 | US 33/SR 287 in Allen Township | SR 4/SR 423 in Marion | 1937 | current | ||
 SR 741 | 27.23 | 43.82 | I-71 in Deerfield Township | I-75 in Moraine | 1938 | current | ||
 SR 743 | 6.76 | 10.88 | 5th Street in Moscow | SR 222 in Washington Township | 1937 | current | ||
 SR 744 | 10.82 | 17.41 | US 127 in Somers Township | SR 122 in Madison Township | 1937 | current | ||
 SR 745 | 9.99 | 16.08 | US 33/SR 161 in Dublin | US 42/SR 257 in Concord Township | 1937 | current | ||
 SR 746 | 13.00 | 20.92 | US 42 in Westfield Township | SR 309 in Caledonia | 1937 | current | ||
 SR 747 | 11.35 | 18.27 | SR 4 in Glendale | SR 4 in Liberty Township | 1937 | current | ||
 SR 748 | 5.80 | 9.33 | SR 126 in Morgan Township | SR 129 in Ross Township | 1937 | current | ||
 SR 749 | 5.51 | 8.87 | US 52 in Pierce Township | SR 132 in Ohio Township | 1937 | current | ||
 SR 750 | 9.67 | 15.56 | SR 257 in Liberty Township | I-71 in Columbus | 1937 | current | ||
 SR 751 | — | — | Madison Township | Columbus | 1937 | 1959 | ||
 SR 751 | 15.96 | 25.69 | SR 93 in West Lafayette | I-77 in Stone Creek | 1962 | current | ||
 SR 752 | 8.43 | 13.57 | US 23 in South Bloomfield | SR 674 on Walnut–Amanda township line | 1937 | current | ||
 SR 753 | 35.35 | 56.89 | SR 41 in Brush Creek Township | US 22 in Washington Court House | 1937 | current | ||
 SR 754 | 6.72 | 10.81 | SR 39/SR 60 in Monroe Township | SR 514 in Ripley Township | 1962 | current | ||
 SR 756 | 13.16 | 21.18 | SR 232 in Monroe Township | SR 505 in Lewis Township | 1937 | current | ||
 SR 757 | 5.68 | 9.14 | SR 13 in Somerset | SR 204 in Hopewell Township | 1938 | current | ||
 SR 761 | 4.33 | 6.97 | SR 313 in Wayne Township | SR 265 in Salesville | 1974 | current | ||
 SR 762 | 14.89 | 23.96 | US 62/SR 3 in Darby Township | CR 385 in Harrison Township | 1938 | current | ||
 SR 763 | 12.70 | 20.44 | SR 41 in Huntington Township | SR 125 in Byrd Township | 1937 | current | ||
 SR 764 | 4.16 | 6.69 | SR 93 in Akron | SR 241 in Akron | 1946 | current | ||
 SR 767 | 0.30 | 0.48 | SR 7 in Bridgeport | US 40/US 250 in Bridgeport | — | — | ||
 SR 768 | 1.70 | 2.74 | US 36 in Mount Vernon | SR 3 in Monroe Township | 1946 | current | ||
 SR 770 | 10.52 | 16.93 | SR 247 in Seaman | SR 73 in Bratton Township | 1937 | current | ||
 SR 771 | 7.11 | 11.44 | SR 138 in Paint Township | SR 28 in Leesburg | 1937 | current | ||
 SR 772 | 45.99 | 74.01 | SR 73 in Rarden | US 50/SR 104 in Chillicothe | 1937 | current | ||
 SR 773 | — | — | Rochester Township | Akron | 1937 | 1937 | ||
 SR 774 | 14.93 | 24.03 | SR 133 in Franklin Township | US 68 in Pike Township | 1938 | current | ||
 SR 775 | 35.30 | 56.81 | WV 106 at West Virginia state line in Proctorville | SR 141 in Green Township | 1937 | current | ||
 SR 776 | 16.27 | 26.18 | SR 335 in Madison Township | SR 139 in Jackson | 1938 | current | ||
 SR 778 | 0.43 | 0.69 | SR 101 in Adams Township | SR 19 in Adams Township | 1942 | current | ||
 SR 780 | — | — | Salem Township | Hamer Township | 1937 | 1946 | ||
 SR 781 | 10.99 | 17.69 | SR 41 in Meigs Township | SR 348 in Jefferson Township | 1938 | current | ||
 SR 782 | — | — | Columbus | Columbus | 1949 | 1957 | ||
 SR 785 | 3.60 | 5.79 | SR 247 in Jackson Township | SR 73 in Jackson Township | 1937 | current | ||
 SR 788 | 6.27 | 10.09 | SR 93 in Jackson | SR 93 in Coal Township | 1939 | current | ||
 SR 790 | 7.22 | 11.62 | SR 775 in Mason Township | SR 218 in Guyan Township | 1937 | current | ||
 SR 791 | — | — | Canton | Canton | 1946 | 1976 | ||
 SR 792 | 5.53 | 8.90 | SR 676 in Wesley Township | SR 266 in Windsor Township | 1937 | current | ||
 SR 793 | — | — | Marble Cliff | Columbus | 1937 | 1937 | ||
 SR 793 | 4.80 | 7.72 | Hocking Township | US 33 in Lancaster | 1959 | 2006 | ||
 SR 794 | — | — | Washingtonville | Marquis | 1937 | 1942 | ||
 SR 794 | 2.51 | 4.04 | US 68 in Green Township | SR 72 in Green Township | 1950 | 2013 | ||
 SR 795 | 12.20 | 19.63 | US 20/SR 199 in Perrysburg | SR 51 on Clay–Allen township line | 1937 | current | ||
 SR 796 | — | — | Rockbridge | Rockbridge | 1938 | 1964 | ||
 SR 797 | — | — | Franklin Township | Mantua Township | 1939 | 1941 | ||
 SR 797 | 1.19 | 1.92 | US 22/US 40 in Perry Township | I-70 in Perry Township | 1946 | 2014 | ||
 SR 798 | 5.29 | 8.51 | Colerain Township | Martins Ferry | 1939 | 1978 | ||
 SR 799 | 6.05 | 9.74 | SR 800 in Washington Township | CR 21/CR 60 in Nottingham Township | 1949 | current | ||
 SR 800 | 110.14 | 177.25 | SR 7 in Jackson Township | I-77 in Canton | 1969 | current | ||
 SR 807 | 0.42 | 0.68 | SR 7 in Newport Township | WV 807 at West Virginia state line in Newport Township | 1977 | current | ||
 SR 814 | 3.07 | 4.94 | US 36 in Union Township | SR 296 in Salem Township | 1982 | current | ||
 SR 821 | 48.90 | 78.70 | SR 60 in Muskingum Township | I-77/SR 209 in Byesville | 1971 | current | ||
 SR 822 | 0.13 | 0.21 | 7th Street in Steubenville | SR 7 in Steubenville | 1990 | current | ||
 SR 823 | 16.00 | 25.75 | US 52 in Sciotodale | US 23 in Lucasville | 2018 | current | ||
 SR 824 | 0.57 | 0.92 | Lebanon Township | Lebanon Township | 1981 | 2003 | ||
 SR 833 | 5.10 | 8.21 | WV 62 in Pomeroy | US 33 / SR 7 / SR 124 near Pomeroy | 2003 | current | ||
 SR 835 | 6.59 | 10.61 | US 35 in Dayton | US 35 in Beavercreek | 1987 | current | ||
 SR 844 | 2.40 | 3.86 | I-675 in Beavercreek | Wright-Patterson Air Force Base entrance in Fairborn | 1994 | current | ||
 SR 850 | 5.04 | 8.11 | SR 588 in Green Township | SR 554 in Springfield Township | 1994 | current | ||
 SR 852 | 0.94 | 1.51 | Carl Perkins Memorial Bridge in Washington Township | SR 73/SR 104 in Washington Township | 1988 | current | ||
 SR 872 | 0.63 | 1.01 | SR 7 in Mead Township | WV 2 Spur at West Virginia state line in Mead Township | 1986 | current | ||
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