Key points from the map
- Montana Highway 200 is the longest state highway in the US, at 706.5 miles according to the map.
- District of Columbia Route 295 is the shortest of the longest, at 4.3 miles.
- The map shows one route for each of the 50 states, Washington, DC and five territories: American Samoa, Guam, the Northern Mariana Islands, Puerto Rico and the US Virgin Islands.
- Each route is drawn with its own state’s sign design, such as California’s green spade, Utah’s beehive and Kansas’s sunflower.
All points are from the graphic, which was made with the MapChart tool and does not name a data source.
Longest state highway in each state, in text
Title: Longest State Highways in Each U.S. State, U.S. Territory & D.C. Text boxes on the map:
- “Montana Highway 200 is the longest state highway in the nation at 706.5 miles.”
- “District of Columbia Route 295 is the shortest of the longest state highways in the nation at 4.3 miles.”
- “Highways are split into at least four types: Interstate, U.S., State, or County. The use of Route or Highway on a local level depends on the state.”
- “Odd-Numbered routes generally run North-to-South and Even-Numbered routes generally run East-to-West.”
The map prints only route numbers on the shields. We have added a length column from Wikipedia’s list of longest state highways, where one exists [1]; it does not cover the territories.
| State, district or territory | Longest state highway on the map | Length in miles, Wikipedia list (our addition) |
|---|---|---|
| Alabama | 3 | 346.6 (lists Route 17) |
| Alaska | 1 | 545.9 |
| Arizona | 87 | 272.7 |
| Arkansas | 7 | 296.0 |
| California | 1 | 655.8 |
| Colorado | 14 | 236.9 |
| Connecticut | 15 | 83.5 |
| Delaware | 1 | 103.0 |
| District of Columbia | 295 | 4.3 |
| Florida | A1A | 338.8 |
| Georgia | 11 | 374 |
| Hawaii | 11 | 122.3 |
| Idaho | 75 | 170.7 |
| Illinois | 1 | 336 |
| Indiana | 37 | 227.8 (lists Road 62) |
| Iowa | 3 | 326.2 |
| Kansas | 4 | 367 |
| Kentucky | 80 | 464.9 |
| Louisiana | 1 | 431.6 |
| Maine | 11 | 401.2 |
| Maryland | 2 | 79.2 |
| Massachusetts | 28 | 151.9 |
| Michigan | M-28 | 290.4 |
| Minnesota | 1 | 346.0 |
| Mississippi | 15 | 344.3 |
| Missouri | 5 | 355 |
| Montana | 200 | 706.6 |
| Nebraska | 92 | 489.1 |
| Nevada | 318 | 110.8 |
| New Hampshire | 16 | 149.8 |
| New Jersey | 47 | 75.2 |
| New Mexico | 120 | 119.9 |
| New York | 17 | 396.8 |
| North Carolina | 24 | 284 |
| North Dakota | 200 | 420 |
| Ohio | 7 | 336.0 |
| Oklahoma | 3 | 615.0 |
| Oregon | 140 | 237.0 |
| Pennsylvania | 18 | 205 |
| Rhode Island | 138 | 48.3 |
| South Carolina | 9 | 257 |
| South Dakota | 34 | 419.0 |
| Tennessee | 1 | 538.8 |
| Texas | 16 | 541.8 |
| Utah | 24 | 160.2 |
| Vermont | 100 | 216.6 |
| Virginia | 40 | 227.7 |
| Washington | 20 | 436.1 |
| West Virginia | 20 | 262.1 |
| Wisconsin | 35 | 412.2 |
| Wyoming | 789 | 407.1 |
| American Samoa | 001 | not listed |
| Guam | 1 | not listed |
| Northern Mariana Islands | 30 | not listed |
| Puerto Rico | 2 | not listed |
| U.S. Virgin Islands | 30 | not listed |
Credit on the map: “Created with mapchart.net”.
Montana Highway 200
Together with North Dakota Highway 200 and Minnesota State Highway 200, Montana Highway 200 forms a route of about 1,356 miles [2]. Wikipedia gives its Montana length as 706.272 miles and describes it as the longest route signed as a state highway in the United States [2]. North Dakota’s longest state highway is the same number, 200, on the map.
State highways, US routes and Interstates
The map covers state highways only. The longest roads in the country are national routes: US Route 20 runs 3,254.49 miles and is the longest road in the United States, roughly parallel in the east to Interstate 90 [3]. I-90 is the longest Interstate at 3,099.7 miles, and Montana has its longest section, almost 552 miles [4].
Notes on this infographic
- Montana Highway 200: the map gives 706.5 miles, Wikipedia’s list 706.624 miles as of 2007 [1] and the route’s own article 706.272 miles [2]. The small differences come from different measurement dates and sources.
- Alabama and Indiana: the map shows Alabama 3 and Indiana 37, while Wikipedia’s list names Alabama State Route 17 and Indiana State Road 62 [1]. The list notes that some states also number US and Interstate highways internally as state routes and excludes those [1], which may explain the difference. We have kept the map’s choices.
- Florida A1A and New Jersey 47 are the longest signed state highways in those states. Wikipedia notes that unsigned designations are longer: Florida State Road 5, which runs along US 1 (536.724 miles), and New Jersey Route 444, the Garden State Parkway (172.4 miles) [1].
- Wikipedia flags its own list as possibly out of date [1], so treat the lengths as approximate.
- “Created with mapchart.net” names the mapping tool, not the person who made the map. We could not find the original post.
Questions about the longest highways in the US
What is the longest highway in the United States?
US Route 20, at 3,254.49 miles [3]. Among state highways, the longest is Montana Highway 200 [1] [2].
What is the longest interstate in the United States?
Interstate 90, an east to west freeway of 3,099.7 miles [4].
Which state has the most roads in the United States?
Texas, with 322,113 miles of public roads in 2023, followed by California with 177,334 miles, according to Federal Highway Administration figures compiled by the University of Kansas [5].
Sources
- Wikipedia, List of longest state highways in the United States.
- Wikipedia, Montana Highway 200.
- Wikipedia, U.S. Route 20.
- Wikipedia, Interstate 90.
- University of Kansas Institute for Policy and Social Research, Public Road Length by State, 2018 to 2023 (from FHWA Highway Statistics, table HM-20).
Last reviewed 30 October 2026
