Interstates by State

This list breaks down the Interstate-Guide by states (and the District of Columbia) and including current, former, future and unsigned routes. Interstate mileage statistics provided for each state and D.C. were obtained from the December 31, 2018 Interstate Route Log and Finders List.

Alabama | 12 active routes | 1,145.49 mi.

Alaska | 4 active routes | 1,082.22 mi.

Arizona | 6 active routes | 1,168.64 mi.

Arkansas | 10 active routes | 747.12 mi.

California | 12 active routes | 2,457.34 mi.

Colorado | 5 active routes | 951.85 mi.

Connecticut | 8 active routes | 346.17 mi.

Delaware | 3 active routes | 40.61 mi.

District of Columbia | 5 active routes | 12.27 mi.

Florida | 12 active routes | 1,497.58 mi.

Georgia | 15 active routes | 1,253.19 mi.

Hawaii | 4 active routes | 54.91 mi.

Idaho | 5 active routes | 611.76 mi.

Illinois | 24 active routes | 2,203.42 mi.

Indiana | 14 active routes | 1,306.52 mi.

Iowa | 10 active routes | 781.24 mi.

Kansas | 9 active routes | 874.34 mi.

Kentucky | 11 active routes | 913.20 mi.

Louisiana | 13 active routes | 933.84 mi.

Maine | 5 active routes | 366.54 mi.

Maryland | 16 active routes | 480.09 mi.

Massachusetts | 13 active routes | 565.63 mi.

Michigan | 13 active routes | 1,240.96 mi.

Minnesota | 9 active routes | 912.73 mi.

Mississippi | 9 active routes | 831.47 mi.

Missouri | 18 active routes | 1,386.23 mi.

Montana | 5 active routes | 1,191.23 mi.

Nebraska | 6 active routes | 481.66 mi.

Nevada | 6 active routes | 623.79 mi.

New Hampshire | 5 active routes | 224.54 mi.

New Jersey | 10 active routes | 431.36 mi.

New Mexico | 3 active routes | 999.90 mi.

New York | 31 active routes | 1,730.34 mi.

North Carolina | 19 active routes# | 1,337.30 mi.

North Dakota | 3 active routes | 571.13 mi.

Ohio | 21 active routes | 1,572.35 mi.

Oklahoma | 7 active routes | 930.16 mi.

Oregon | 6 active routes | 727.41 mi.

Pennsylvania | 23 active routes## | 1,862.21 mi.

Puerto Rico | 3 active routes | 249.77 mi.

Rhode Island | 3 active routes | 68.53 mi.

South Carolina | 11 active routes | 850.80 mi.

South Dakota | 4 active routes | 678.31 mi.

Tennessee | 17 active routes### | 1,959.54 mi.

Texas | 25 active routes | 3,501.15 mi.

Utah | 5 active routes | 938.00 mi.

Vermont | 4 active routes | 320.22 mi.

Virginia | 16 active routes | 1,117.23 mi.

Washington | 7 active routes | 763.67 mi.

West Virginia | 7 active routes | 549.05 mi.

Wisconsin | 7 active routes | 741.80 mi.

Wyoming | 4 active routes | 913.60 mi.

# – I-495 was renumbered as I-87 in 2016
## – I-295 was established over a portion of I-95 in Bucks County in 2018

### – The remainder of I-181 was renumbered as an extension of I-26 in 2005.

Page updated March 18, 2019.