The following is a list of county routes in Humboldt County, Iowa . All county roads are maintained by the county in which they reside, and all are marked with standard MUTCD approved county road shields. Humboldt County's routes all follow Iowa's alphanumeric system.
This list is up to date as of December 2017. [1]
| # | Surface | Direction and Termini | Mileage (km) | Notes | |||
|---|---|---|---|---|---|---|---|
 CR C12 | Paved | E/W | US 169 | to | IA 17 | 13.0 miles (20.9 km) | Former Iowa 408 |
 CR C18 | Paved/Gravel | E/W | Pocahontas CR C18 | to | Bode | 9.0 miles (14.5 km) | |
 CR C20 | Paved | E/W | IA 15 | to | IA 17 | 26.9 miles (43.3 km) | Portions former Iowa 222 |
 CR C23 | Gravel | E/W | P33 | to | P56 | 5.5 miles (8.9 km) | |
 CR C26 | Paved | E/W | Pocahontas CR C26 | to | Wright CR C26 | 26.5 miles (42.6 km) | |
 CR C28 | Gravel | E/W | P66 | to | Smith St., Renwick | 3.5 miles (5.6 km) | |
 CR C29 | Paved/Gravel | E/W | P19 | to | US 169 | 12.1 miles (19.5 km) | East portion formerly Iowa 367 |
 CR C30 | Paved | E/W | P66 | to | IA 17 | 4.0 miles (6.4 km) | |
 CR C44 | Paved/Gravel | E/W | P19 | to | US 169 | 11.0 miles (17.7 km) | Locally Wildcat Road |
| Gravel | E/W | P56 | to | P66 | 6.7 miles (10.8 km) | ||
 CR C46 | Paved/Gravel | E/W | P19 | to | US 169 | 11.0 miles (17.7 km) | |
 CR C48 | Paved | E/W | P56 | to | Thor | 6.6 miles (10.6 km) | |
 CR C49 | Paved | E/W | Pocahontas CR C49 | to | US 169 | 11.0 miles (17.7 km) | |
 CR C54 | Paved | E/W | P66 | to | Wright County Line | 4.0 miles (6.4 km) | |
 CR P19 | Paved | N/S | C49 | to | IA 15 | 17.2 miles (27.7 km) | |
 CR P20 | Paved | N/S | C26 | to | Kossuth CR P20 | 7.5 miles (12.1 km) | |
 CR P23 | Paved/Gravel | N/S | C49 | to | C26, Bradgate | 14.9 miles (24.0 km) | |
 CR P29 | Paved | N/S | Webster CR P29 | to | IA 3 | 6.0 miles (9.7 km) | |
 CR P30 | Paved | N/S | C20 | to | Kossuth CR P30 | 1.2 miles (1.9 km) | |
 CR P33 | Paved/Gravel | N/S | Webster County line | to | C20, Bode | 15.5 miles (24.9 km) | |
 CR P56 | Paved/Gravel | N/S | Webster County line | to | C12 | 20.6 miles (33.2 km) | Colloquially "County K" |
 CR P57 | Gravel | N/S | IA 3 | to | C20 | 11.9 miles (19.2 km) | |
 CR P59 | Paved | N/S | Webster CR 59 | to | C48 | 3.0 miles (4.8 km) | |
 CR P60 | Paved | N/S | C20 | to | C12, Lu Verne | 2.4 miles (3.9 km) | |
 CR P63 | Paved/Gravel | N/S | Webster CR | to | C26 | 11.0 miles (17.7 km) | |
 CR P66 | Paved | N/S | C48, Thor | to | C12 | 15.3 miles (24.6 km) | |
 CR P76 | Gravel | N/S | IA 17, Renwick | to | C12 | 6.4 miles (10.3 km) | |
U.S. Highway 218 is an original United States Highway, created in 1926. Although technically a spur of U.S. Route 18, US 218 neither begins nor ends at US 18, but overlaps US 18 for 8 miles (13 km) near Charles City, Iowa. US 218 begins at U.S. Route 136 in downtown Keokuk and ends 319 miles (513 km) away at Interstate 35 and U.S. Route 14 at Owatonna, Minnesota. A large portion of US 218 in Iowa is part of the Avenue of the Saints, which connects St. Louis, Missouri, and Saint Paul, Minnesota.
Iowa Highway 17 is a 103-mile-long (166 km) north–south state highway that traverses primarily rural areas in central and north-central Iowa. Iowa 17's southern end is near Granger in Dallas County at a freeway interchange with Iowa Highway 141, and its northern terminus is at an intersection with U.S. Highway 18 at the Kossuth-Hancock county line near Wesley.
State Route 211 is a state highway in the U.S. state of California that connects Ferndale with U.S. 101 in Humboldt County. The highway was originally designed to be the northernmost segment of State Route 1, but after construction of the Coast Highway through the Lost Coast region was abandoned, the route to Ferndale was renumbered to SR 211.
State Route 200 is a state highway in the U.S. state of California near Arcata in Humboldt County. It is a cut-off connecting U.S. Route 101 and State Route 299. It runs along the north bank of the Mad River, to the north of the 101-299 junction.
State Route 255 is a state highway in the U.S. state of California. It is a loop route of U.S. Route 101 in Humboldt County that runs through the Samoa Peninsula on the western side of Humboldt Bay.
Iowa Highway 3 (Iowa 3) is a state highway that runs from east to west across the state of Iowa. It is the longest state highway in Iowa, at 323 miles (520 km) long. Iowa 3 begins at the South Dakota state line where it continues as South Dakota Highway 50 and ends at the Northwest Arterial at the Dubuque city limits. It is designated the American Veterans Memorial Highway for its entirety. It is located approximately halfway between Interstate 80 and Interstate 90.
State Route 230 (SR 230) is a state highway central Elko County, Nevada, United States. It is a southern loop route off of Interstate 80 (I‑80) between Elko and Wells, serving the communities of Deeth and Welcome and various ranches within Starr Valley. The road follows a "U" shaped path and passes close to the East Humboldt Range. The road was constructed by 1962, but was not designated as a state highway until 1992.
State Route 292 is a short state highway on the northern edge of Humboldt County, Nevada, United States, that serves the community of Denio.
Iowa Highway 15 is a north–south state highway in northern Iowa. It is 63+1⁄2 miles (102.2 km) long. The southern end of Iowa 15 is 7 miles (11 km) east of Pocahontas at an intersection with Iowa Highway 3. The northern end is at the Minnesota border, where the highway continues north as Minnesota State Highway 15 near Fairmont, Minnesota. Prior to 1969, the route was known as Iowa Highway 44; it was renumbered to match the highway in Minnesota.
U.S. Highway 20 in Iowa is a major east–west artery which runs across the state, separating the northern third of Iowa from the southern two-thirds. It enters Iowa from Nebraska, concurrent with Interstate 129 and U.S Route 75, crossing the Missouri River at Sioux City. US 20 runs in a more-or-less straight line across Iowa, paralleling 42° 27' N. It leaves Iowa in Dubuque by crossing the Mississippi River into Illinois. Since October 2018, US 20 is a four-lane divided highway for its entire length in Iowa.
U.S. Highway 30 (US 30) is a major east–west U.S. Highway which spans 330 miles (530 km) across the state of Iowa. It is the longest primary highway in the state and is maintained by the Iowa Department of Transportation. The route in Iowa begins at the Missouri River crossing at Blair, Nebraska, and ends at the Mississippi River crossing at Clinton, Iowa. Along the way, it serves Denison and Carroll in western Iowa, Boone, Ames, and Marshalltown in central Iowa, and Tama, Cedar Rapids, and DeWitt in eastern Iowa. Cutting across the central portion of the state, US 30 runs within close proximity of the Union Pacific Railroad's Overland Route for its entire length.
U.S. Highway 6 (US 6) is an east–west U.S. Highway which runs 319 miles (513 km) across the U.S. state of Iowa. The route is signed in places as the Grand Army of the Republic Highway. Like all state highways in Iowa, it is maintained by the Iowa Department of Transportation. The route begins at the Missouri River crossing at Council Bluffs. From there, it travels east through Oakland and Atlantic. North of Atlantic, the highway overlaps Interstate 80 (I-80) until De Soto. Between De Soto and Adel, the highway overlaps US 169 before splitting off to the east towards Des Moines. Through the Des Moines area, the highway runs about one mile (1.6 km) north or south of the I-35 / I-80 corridor.
Iowa Highway 105 was an east–west route which ran 34 miles (55 km) from Lake Mills to St. Ansgar in northern Iowa. Since January 1, 1993, Iowa 105 has been known as County Road 105 (CR 105). County Road 105 was the first county road in Iowa to not follow the standard alphanumeric route numbering system.
Iowa Highway 333 (Iowa 333) is a short highway in southwestern Iowa. It serves as a connector route between Interstate 29 (I-29) and U.S. Highway 275 (US 275) in Hamburg. Formerly spanning two counties, Iowa 333 is one of the shortest state highways in Iowa.
State Route 795 is a short state highway in southern Humboldt County, Nevada, United States. One of Nevada's newest state routes, SR 795 primarily serves as a connector road north of Winnemucca.
Several special routes of U.S. Route 61 exist in the states of Louisiana, Mississippi, and Iowa.
State Route 789 is a state highway in Humboldt County, Nevada connecting the town of Golconda to nearby mining districts. Much of the route previously existed as State Route 18 prior to 1976.
Several special routes of U.S. Route 30 exist. In order from west to east they are as follows.
U.S. Highway 18 (US 18) is the northernmost east–west U.S. Highway in the state of Iowa. As with all state highways in Iowa, it is maintained by the Iowa Department of Transportation (Iowa DOT). It enters the state by crossing the Big Sioux River between Inwood and Canton, South Dakota. It travels 311 miles (501 km) and connects Spencer, Mason City and Charles City. The highway leaves the state via the Marquette–Joliet Bridge over the Mississippi River at Marquette. Prior to becoming a U.S. Highway, the route US 18 follows was known as Primary Road No. 19 and the National Parks Pike.
U.S. Highway 63 (US 63) is a United States Highway that runs through the eastern third of Iowa. It begins at the Missouri state line southwest of Bloomfield and travels north through Ottumwa, Oskaloosa, Tama, Waterloo, and New Hampton. It ends at the Minnesota state line at Chester. Between Ottumwa and Oskaloosa, the highway is a four-lane controlled-access highway. Through Waterloo and New Hampton, it is partially controlled; that is, the road as both grade-separated interchanges and at-grade intersections. The rest of the highway is largely a two-lane rural highway.
Municipalities and communities of Humboldt County, Iowa, United States | ||
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| Cities |  | |
| Townships | ||
| Unincorporated communities | ||
| Ghost town | ||
| Footnotes | ‡This populated place also has portions in an adjacent county or counties | |