List of primary Interstate Highways

Last updated

Dwight D. Eisenhower National System of Interstate and Defense Highways
I-90.svg
MUTCD M1-10.svg
Highway shield for Interstate 90 and the Eisenhower Interstate System
List of primary Interstate Highways
Primary Interstate Highways in the 48 contiguous states as of 2024
System information
FormedJune 29, 1956 [1]
Highway names
Interstates Interstate X (I-X)
System links

There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in the west and higher numbers in the east. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.

Contents

Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico.

Contiguous United States

There are 71 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highway. This number does not include auxiliary Interstate Highways.

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-2.svg I-2 46.8075.32 US 83/Bus. US 83-S in La Joya, TX I-69E/US 77/US 83 in Harlingen, TX 02013-01-012013currentUnfinished in Texas; Texas only
I-4.svg I-4 132.30212.92 I-275 in Tampa, FL I-95/SR 400 at Daytona Beach, FL 01959-01-011959currentFlorida only
I-5.svg I-5 1,381.292,222.97 Fed. 1/Fed. 1D at San Diego, CA Highway 99 at Blaine, WA 01956-01-011956currentServes three states: California, Oregon, Washington
Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California
I-8.svg I-8 350.34563.82Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, CA I-10 in Casa Grande, AZ 01964-01-011964currentServes two states: California, Arizona
I-10.svg I-10 2,460.343,959.53 SR 1 in Santa Monica, CA I-95/US 17 in Jacksonville, FL 01957-01-011957currentServes eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida
Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910
I-11.svg I-11 54.19387.215 US 93 at the Arizona state lineFuture I-11/US 95/SR 157 in Las Vegas, NV 02017-01-012017currentUnfinished in Nevada; Nevada only; planned in one more: Arizona
I-12.svg I-12 85.59137.74 I-10 in Baton Rouge, LA I-10/I-59 in Slidell, LA 01967-01-011967currentLouisiana only
I-14.svg I-14 25.1040.39 US 190/US 190 Bus. in Copperas Cove, TX I-35/US 190 in Belton, TX 02017-01-262017currentUnfinished in Texas; Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia
Planned associated routes: I-14N, I-14S, and I-214 in Texas
I-15.svg I-15 1,433.522,307.03 I-8/SR 15 in San Diego, CA Highway 4 at Sweetgrass, MT 01957-01-011957currentUnfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana
Associated routes: I-115, I-215, I-315
I-16.svg I-16 166.81268.45 I-75/SR 540 in Macon, GA Montgomery Street in Savannah, GA 01966-01-011966currentGeorgia only
Associated route: I-516
I-17.svg I-17 145.93234.85 I-10/US 60 in Phoenix, AZ I-40/SR 89A in Flagstaff, AZ 01961-01-011961currentArizona only
I-19.svg I-19 63.43102.08 I-19 BL in Nogales, AZ I-10 in Tucson, AZ 01972-01-011972currentArizona only
Uses kilometers instead of miles
I-20.svg I-20 1,539.382,477.39 I-10 in Reeves County, TX I-95 & I-20 Bus. in Florence, SC 01957-01-011957currentServes six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina
Associated routes: I-220, I-520, I-820
I-22.svg I-22 202.22325.44 I-269/US 78/MS 304 in Byhalia, MS I-65 in Birmingham, AL 02012-01-012012currentUnfinished in Alabama; serves two states: Mississippi, Alabama
Planned associated routes: I-222 and I-422 in Alabama
I-24.svg I-24 316.36509.13 I-57 in Pulley's Mill, IL I-75/US 74 in East Ridge, TN 01962-01-011962currentServes four states: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
I-25.svg I-25 1,061.671,708.59 I-10/US 85/US 180 in Las Cruces, NM I-90/US 87 in Buffalo, WY 01957-01-011957currentServes three states: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26.svg I-26 328.09528.01 US 11W/US 23 in Kingsport, TN
I-40/I-240/US 74 in Asheville, NC
US 19/US 23 south of Forks of Ivy, NC
US 17 in Charleston, SC
01960-01-011960currentUnfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
I-27.svg I-27 128.332206.530 US 87 in Lubbock, TX I-40/US 60/US 87/US 287 in Amarillo, TX 01969-01-011969currentUnfinished in Texas; Texas only; planned in one more: New Mexico; Planned associated routes in Texas: I-27E, I-27W, I-27N [3]
I-29.svg I-29 750.581,207.94 I-35/I-70/US 24/US 40/US 71 in Kansas City, MO PTH 75 at Pembina, ND 01958-01-011958currentServes four states: Missouri, Iowa, South Dakota, North Dakota
Associated routes: I-129, I-229
I-30.svg I-30 366.76590.24 I-20 northeast of Aledo, TX I-40/US 65/US 67/US 167/AR 107 in North Little Rock, AR 01957-01-011957currentServes two states: Texas, Arkansas
Associated routes: I-430, I-530, I-630
I-31.svg I-31 I-94 in Fargo, ND US 81 & PTH 75 at Pembina, ND 01957-01-01195701958-01-011958Served North Dakota only
Replaced by a northward extension of I-29
I-35.svg I-35 1,569.062,525.16 US 83 in Laredo, TX
I-35W & I-35E in Denton, TX
I-35W & I-35E in Columbus, MN
I-35W & I-35E in Hillsboro, TX
I-35W & I-35E in Burnsville, MN
MN 61 in Duluth, MN
01956-01-011956currentServes six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota
Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635
I-37.svg I-37 143.00230.14 US 181/SH 35 in Corpus Christi, TX I-35/US 281 in San Antonio, TX 01959-01-011959currentTexas only
I-39.svg I-39 306.14492.68 I-55/US 51 in Normal, IL US 51/WIS 29 west of Rothschild, WI 01984-01-011984currentServes two states: Illinois, Wisconsin
I-40.svg I-40 2,556.614,114.46 I-15 in Barstow, CA US 117 in Wilmington, NC 01957-01-011957currentServes eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina
Associated routes: I-140, I-240, I-440, I-540, I-640, I-840
I-41.svg I-41 175.00281.64 I-94/US 41 in Russell, IL I-43/US 41/US 141 in Howard, WI 02015-01-012015currentServes two states: Illinois, Wisconsin
I-42.svg I-42 190310 I-35 in Noble County, OK I-49 in Springdale, AR proposedFuture Interstate; will serve two states: Oklahoma, Arkansas
I-42.svg I-42 31.550.7 I-40/NC 540 southeast of Garner, NC
US 70 in Goldsboro, NC
US 70/US 70 Bus. southeast of Clayton, NC
US 70 in La Grange, NC
02024-01-012024currentUnfinished in North Carolina; North Carolina only
I-43.svg I-43 191.55308.27 I-39/I-90 in Beloit, WI I-41/US 41/US 141 in Howard, WI 01981-01-011981currentWisconsin only
I-44.svg I-44 636.691,024.65 US 82/US 277/US 281/US 287 in Wichita Falls, TX I-70 in St. Louis, MO 01958-01-011958currentServes three states: Texas, Oklahoma, Missouri
Associated routes: I-244, I-344, I-444
I-45.svg I-45 284.91458.52 SH 87/Spur 342 in Galveston, TX I-30/I-345/US 67 in Dallas, TX 01971-01-011971currentTexas only
Associated route: I-345
I-49.svg I-49 547.52881.15 I-10/US 167/LA 182 in Lafayette, LA
I-220 in Shreveport, LA
I-40/US 71 at Alma, AR
I-20 in Shreveport, LA
US 59/US 71 in Texarkana, AR
I-435/I-470/US 50/US 71 in Kansas City, MO
01984-01-011984currentUnfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas
I-55.svg I-55 964.251,551.81 I-10 in LaPlace, LA US 41 in Chicago, IL 01960-01-011960currentServes six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Associated routes: I-155, I-255, I-355, I-555
I-57.svg I-57 508.92819.03 I-40/US 67/US 167 in North Little Rock, AR
I-55/US 60 in Sikeston, MO
US 67/US 412/US 412B in Walnut Ridge, AR
I-94 in Chicago, IL
01965-01-011965currentUnfinished in Missouri and Arkansas; serves three states: Arkansas, Missouri, Illinois.
I-59.svg I-59 445.23716.53 I-10/I-12 in Slidell, LA I-24 in Wildwood, GA 01960-01-011960currentServes four states: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
I-64.svg I-64 963.521,550.64 I-70/US 40/US 61 in Wentzville, MO I-264/I-664/US 13/US 58/US 460 in Chesapeake, VA 01961-01-011961currentServes six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia
Associated routes: I-264, I-464, I-564, I-664
I-65.svg I-65 887.301,427.97 I-10 in Mobile, AL US 12/US 20 in Gary, IN 01958-01-011958currentServes four states: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky
I-66.svg I-66 Wichita, KS Near Pikeville, KY 01991-01-01199102015-01-012015 [4] Served four states: Kansas, Missouri, Illinois, Kentucky
Associated routes: I-66 Spur in Kentucky
The project was unpopular and ultimately cancelled without the interstate being completed; I-66 Spur eventually became I-165
I-66.svg I-66 76.28122.76 I-81 southwest of Middletown, VA US 29 in Washington, D.C. 01961-01-011961currentServes DC and one state: Virginia
I-68.svg I-68 113.15182.10 I-79 in Morgantown, WV I-70/US 40/US 522 in Hancock, MD 01991-01-011991currentServes two states: West Virginia, Maryland
I-69.svg I-69 910.101,464.66 US 59 in Rosenberg, TX
MS 713 southwest of Banks, MS
US 51 in Fulton, KY
US 41 in Evansville, IN
US 59 in Splendora, TX
US 51 in Memphis, TN
US 41 in Henderson, KY
Hwy 402 at Port Huron, MI
01957-01-011957current
I-70.svg I-70 2,171.713,495.03 I-15 in Cove Fort, UT I-695 in Woodlawn, MD 01956-01-011956currentServes 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland
Associated routes: I-170, I-270, I-370, I-470, I-670
I-71.svg I-71 345.57556.14 I-64/I-65 in Louisville, KY I-90 & I-490 in Cleveland, OH 01959-01-011959currentServes two states: Kentucky, Ohio
Associated routes: I-271, I-471
I-72.svg I-72 179.29288.54 US 36/US 36 Bus./US 61 (Avenue of the Saints)/Route 110 (CKC) in Hannibal, MO University Avenue & Church Street in Champaign, IL 01970-01-011970currentServes two states: Missouri, Illinois
Associated route: I-172
I-73.svg I-73 101.10162.70 I‑74/US 74/US 74 Bus. west of Rockingham, NC US 220/NC 68 northeast of Stokesdale, NC 01997-01-011997currentUnfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan
I-74.svg I-74 541.62871.65 I-80 in Davenport, IA
I-77 at the Virginia state line northwest of Pine Ridge, NC
I-40 in Winston-Salem, NC
US 74 Alt./US 74 Bus. in Maxton, NC
I-75/US 52 in Cincinnati, OH
US 52 in Mount Airy, NC
US 74 Bus. northwest of Hamlet, NC
US 74 southwest of Lumberton, NC
01974-01-011974currentUnfinished in Ohio and North Carolina; serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina
Associated routes: I-474; Planned: I-274 in North Carolina
I-75.svg I-75 1,786.472,875.04 SR 826/SR 924 in Miami Lakes, FL International Bridge at Sault Ste. Marie, MI 01958-01-011958currentServes six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I-76.svg I-76 187.29301.41 I-70 in Arvada, CO I-80 at Big Springs, NE 01975-01-011975currentServes two states: Colorado, Nebraska
I-76.svg I-76 435.66701.13 I-71/US 224 in Westfield Township, OH I-295/Route 42 in Bellmawr, NJ 01964-01-011964currentServes three states: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676
I-77.svg I-77 610.10981.86 I-26 in Cayce, SC I-90 in Cleveland, OH 01958-01-011958currentServes five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated route: I-277
I-78.svg I-78 146.28235.41 I-81 in Union Township, PA Canal Street in New York, NY 01957-01-011957currentServes three states: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478, I-678, I-878
I-79.svg I-79 343.46552.75 I-77 in Charleston, WV PA 5/PA 290/Bayfront Parkway in Erie, PA 01967-01-011967currentServes two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-80.svg I-80 2,900.764,668.32 US 101 in San Francisco, CA I-95 in Teaneck, NJ 01956-01-011956currentServes 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey
Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
I-81.svg I-81 855.021,376.02 I-40 in Dandrige, TN Hwy 137 at Wellesley Island, NY 01961-01-011961currentServes six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York
Associated routes: I-381, I-481, I-581, I-781
I-82.svg I-82 143.58231.07 I-90/US 97 in Ellensburg, WA I-84/US 30 in Hermiston, OR 01957-01-011957currentServes two states: Washington, Oregon
Associated route: I-182
I-82.svg I-82 I-81/I-84/US 6 in Scranton, PA I-95 in Teaneck, NJ 01957-01-01195701958-01-011958Served two states: Pennsylvania, New Jersey
Was the initial designation to what is now I-380 and I-80
I-82.svg I-82 I-84 in East Hartford, CT Providence, RI 01956-01-01195601968-01-011968Served one state: Connecticut, was planned for one state: Rhode Island
Redesignated as I-84 in 1968
I-83.svg I-83 85.03136.84President Street/Fayette Street in Baltimore, MD I-81/US 322 north of Progress, PA 01959-01-011959currentServes two states: Maryland, Pennsylvania
Associated route: I-283
I-84.svg I-84 769.621,238.58 I-5/US 30 in Portland, OR I-80/US 189 in Echo, UT 01980-01-011980currentServes three states: Oregon, Idaho, Utah
Associated route: I-184
I-84.svg I-84 232.71374.51 I-81/I-380/US 6 in Dunmore, PA I-90/Massachusetts Turnpike in Sturbridge, MA 01963-01-011963currentServes four states: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684
I-85.svg I-85 666.051,071.90 I-65/US 82 in Montgomery, AL I-95/US 460 in Petersburg, VA 01958-01-011958currentUnfinished in Alabama; serves five states: Alabama, Georgia, South Carolina, North Carolina, Virginia
Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina
I-86.svg I-86 62.85101.15 I-84/US 30 northeast of Declo, ID I-15 in Chubbuck, ID 01980-01-011980currentIdaho only
I-86.svg I-86 254.02408.81 I-90 in Greenfield Township, PA
I-81/NY 17/NY 990G in Kirkwood, NY
NY 17/NY 26 in Vestal, NY
NY 17/NY 79 in Windsor, NY
01999-01-011999currentUnfinished in New York; serves two states: Pennsylvania, New York
I-86.svg I-86 38.9762.72 I-84 in East Hartford, CT I-90 in Sturbridge, MA 01968-01-01196801984-01-011984Served two states: Connecticut, Massachusetts
Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled
I-87.svg I-87 12.9020.76 I-40/I-440/US 64 in Raleigh, NC US 64/US 264 in Wendell, NC 02017-01-012017currentUnfinished in North Carolina; North Carolina only; planned in one more: Virginia
Associated route: I-587
I-87.svg I-87 333.49536.70 I-278 in Port Morris, NY A-15 at Champlain, NY 01957-01-011957currentNew York only
Associated routes: I-287, I-587, I-787
I-88.svg I-88 140.60226.27 I-80/IL 5/IL 92/Route 110 (CKC) northeast of East Moline, IL I-290/Route 110 (CKC) in Hillsdale, IL 01987-01-011987currentIllinois only
I-88.svg I-88 117.75189.50 I-81 in Chenango, NY I-90/New York State Thruway in Rotterdam, NY 01968-01-011968currentNew York only
I-89.svg I-89 191.12307.58 I-93/Everett Turnpike/NH 3A in Bow, NH Route 133 at Highgate, VT 01960-01-011960currentServes two states: New Hampshire, Vermont
Associated route: I-189
I-90.svg I-90 3,099.744,988.55 SR 519 in Seattle, WA Route 1A in Boston, MA 01956-01-011956currentServes 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts
Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990
Longest Interstate highway
I-91.svg I-91 290.37467.31 I-95 in New Haven, CT A-55 at Derby Line, VT 01958-01-011958currentServes three states: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691
I-93.svg I-93 189.95305.69 I-95/US 1/Route 128 in Canton, MA I-91 in Waterford, VT 01957-01-011957currentServes three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
I-94.svg I-94 1,555.432,503.22 I-90/US 87/US 212 in Lockwood, MT Highway 402 at Port Huron, MI 01956-01-011956currentServes seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan
Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894
I-95.svg I-95 1,905.963,067.35 US 1 in Miami, FL Route 95 at Houlton, ME 01957-01-011957currentServes DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine
Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895
Longest primary north-south Interstate highway
I-96.svg I-96 192.032309.046 US 31 in Norton Shores, MI I-75 in Detroit, MI 01959-01-011959currentMichigan only
Associated routes: I-196, I-296, I-496, I-696
I-97.svg I-97 17.6228.36 US 50/US 301 in Parole, MD I-695/I-895A in Brooklyn Park, MD 01987-01-011987currentMaryland only
I-99.svg I-99 161.68260.20 US 220/US 220 Bus. north of Bedford, PA
I-180/US 15/US 220 in Williamsport, PA
US 220/PA 26 northeast of Bellefonte, PA
I-86/US 15/NY 17/NY 352 at Painted Post, NY
01998-01-011998currentUnfinished in Pennsylvania; serves two states: Pennsylvania, New York
  •       Former
  •       Proposed and unbuilt

Other regions

In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the mainland routes:

Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway. [5]

Hawaii

List of primary Interstate Highways
Map of Hawaii's Interstate Highways (excluding H-201)

The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-H1.svg H-1 27.1643.71 Route 93 in Kapolei Route 72 in Honolulu 01960-01-011960currentAssociated route: H-201
I-H2.svg H-2 8.3313.41 H-1 in Pearl City Route 99 in Wahiawa 01960-01-011960current
I-H3.svg H-3 15.3224.66 H-1/H-201 in Halawa Marine Corps Base Hawaii 01997-01-011997current

Alaska

List of primary Interstate Highways
Map of Alaska's Interstate Highways

Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers. [6]

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-A1.svg A-1 408.23656.98 Anchorage Hwy. 1 at Alcan Border 01976-01-011976current Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway [7] [8] [9] [10]
I-A2.svg A-2 202.18325.38 Tok Fairbanks 01976-01-011976current Alaska Highway, Richardson Highway [8] [9] [10]
I-A3.svg A-3 148.12238.38 Anchorage Soldotna 01976-01-011976current Seward Highway, Sterling Highway [7] [9] [10]
I-A4.svg A-4 323.69520.93 Gateway, near Palmer Fairbanks 01976-01-011976current Parks Highway [7] [8] [9] [10]

Puerto Rico

Map of the Interstates in Puerto Rico Puerto Rico Interstates.svg
Map of the Interstates in Puerto Rico

Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads. [11]

NumberLength (mi) [2] Length (km)Southern or western terminusNorthern or eastern terminusFormedRemovedNotes
I-PR1.svg PR-1 71.08114.39 PR-2 in Ponce PR-2 in San Juan 01976-01-011976currentFollows PR-52
I-PR2.svg PR-2 138.13222.30 PR-1 in Ponce PR-3 in San Juan 01976-01-011976currentFollows PR-22
I-PR3.svg PR-3 40.5665.27 PR-3 in Humacao PR-2 in San Juan 01976-01-011976currentFollows PR-66

See also

References

  1. Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Archived from the original on September 23, 2021. Retrieved March 16, 2012.
  2. 1 2 3 4 "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018". FHWA Route Log and Finder List. Federal Highway Administration. May 6, 2019. Retrieved April 21, 2021.
  3. United States Congress (March 22, 2024). "Text - S.992 - 118th Congress (2023-2024): I-27 Numbering Act of 2023". Congress.gov. Library of Congress. Retrieved February 21, 2025.
  4. Nelsen, Carrie (July 9, 2015). "For Immediate Release" (PDF) (Press release). Illinois Department of Transportation. Archived from the original (PDF) on September 6, 2015.
  5. Staff. "FHWA Route Log and Finder List". Federal Highway Administration. Retrieved May 24, 2007.
  6. Voss, Oscar. "Alaska Roads: Interstate ends photos" . Retrieved May 24, 2007.
  7. 1 2 3 Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.
  8. 1 2 3 Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  9. 1 2 3 4 Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  10. 1 2 3 4 Staff. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  11. Voss, Oscar. "Puerto Rico road photos" . Retrieved May 24, 2007.