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, 2016 Interstate Route Log and Finders List.

Alabama | 1,001.39 mi.

I-10, I-20, I-22, I-59, I-65, I-85
I-210, I-222, I-422, I-359, I-459, I-759, I-165, I-565

Alaska | 1,082.22 mi.

I-A-1, I-A-2, I-A-3, I-A-4

Arizona | 1,168.64 mi.

I-8, I-10, I-11, I-15, I-17, I-19, I-40

Arkansas | 744.90 mi.

I-30, I-40, I-49, I-55, I-57, I-69
I-130, I-430, I-530, I-630, I-440, I-540, I-555

California | 2,455.74 mi.

I-5, I-8, I-10, I-15, I-40, I-80
I-105, I-205, I-305, I-405, I-505, I-605, I-805, I-905,
I-110, I-210, I-710, I-215, I-238, I-280, I-380, I-580, I-680, I-780, I-880, I-980

Colorado | 951.85 mi.

I-25, I-70, I-76
I-225, I-270

Connecticut | 346.17 mi.

I-84, I-91, I-95
I-384, I-684, I-291, I-691, I-395

Delaware | 40.61 mi.

I-95
I-295, I-495

District of Columbia | 12.27 mi.

I-66, I-95
I-295, I-395, I-495, I-695

Florida | 1,497.58 mi.

I-4, I-10, I-75, I-95
I-110, I-175, I-275, I-375, I-195, I-295, I-395, I-595, I-795

Georgia | 1,243.98 mi.

I-16, I-20, I-59, I-75, I-85, I-95
I-516, I-420, I-520, I-475, I-575, I-675, I-185, I-285, I-485, I-985

Hawaii | 54.91 mi.

I-H1, I-H2, I-H3
I-H201

Idaho | 611.76 mi.

I-15, I-84, I-86, I-90
I-184

Illinois | 2,181.83 mi.

I-24, I-39, I-55, I-57, I-64, I-70, I-72, I-74, I-80, I-88, I-90, I-94
I-155, I-255, I-355, I-270, I-172, I-474, I-180, I-280, I-190, I-290, I-390, I-490, I-294

Indiana | 1,285.52 mi.

I-64, I-65, I-69, I-70, I-74, I-80, I-90, I-94
I-164, I-469, I-265, I-465, I-865, I-275

Iowa | 781.24 mi.

I-29, I-35, I-74, I-80
I-129, I-235, I-280, I-380, I-480, I-680

Kansas | 874.34 mi.

I-35, I-70
I-135, I-235, I-335, I-435, I-635, I-470, I-670

Kentucky | 843.00 mi.

I-24, I-64, I-65, I-66, I-69, I-71, I-75
I-165, I-264, I-265, I-169, I-275, I-471

Louisiana | 933.84 mi.

I-10, I-12, I-20, I-49, I-55, I-59, I-69
I-110, I-210, I-310, I-510, I-610, I-910, I-220

Maine | 366.54 mi.

I-95
I-195, I-295, I-395, I-495

Maryland | 480.09 mi.

I-68, I-70, I-81, I-83, I-95, I-97
I-170, I-270, I-370, I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895

Massachusetts | 565.63 mi.

I-84, I-90, I-91, I-93, I-95
I-190, I-290, I-291, I-391, I-195, I-295, I-395, I-495

Michigan | 1,240.77 mi.

I-69, I-75, I-94, I-96
I-275, I-375, I-475, I-675, I-194, I-196, I-296, I-496, I-696

Minnesota | 912.73 mi.

I-35, I-35E, I-35W, I-90, I-94
I-535, I-394, I-494, I-694

Mississippi | 805.54 mi.

I-10, I-20, I-22, I-55, I-59, I-69
I-110, I-310, I-220, I-269

Missouri | 1,386.23 mi.

I-29, I-35, I-44, I-49, I-55, I-57, I-66, I-70, I-72
I-229, I-435, I-635, I-155, I-255, I-170, I-270, I-470, I-570, I-670

Montana | 1,191.23 mi.

I-15, I-90, I-94
I-115, I-315

Nebraska | 481.66 mi.

I-76, I-80
I-129, I-180, I-480, I-580, I-680

Nevada | 596.147 mi.

I-11, I-15, I-80
I-215, I-515, I-580

New Hampshire | 224.54 mi.

I-89, I-93, I-95
I-293, I-393

New Jersey | 431.36 mi.

I-76, I-78, I-80, I-95
I-676, I-278, I-280, I-287, I-195, I-295, I-495

New Mexico | 999.90 mi.

I-10, I-25, I-40

New York | 1,731.46 mi.

I-78, I-81, I-84, I-86, I-87, I-88, I-90, I-95, I-99
I-278, I-478, I-678, I-878, I-481, I-781, I-684, I-287, I-587, I-687, I-787, I-190
I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990, I-295, I-495, I-695, I-895

North Carolina | 1,273.13 mi.

I-26, I-40, I-42, I-73, I-74, I-77, I-85, I-87, I-95
I-140, I-240, I-440, I-540, I-840, I-274, I-277, I-285, I-485, I-587, I-785, I-885, I-295, I-495, I-795

North Dakota | 571.13 mi.

I-29, I-94
I-194

Ohio | 1,572.35 mi.

I-70, I-71, I-74, I-75, I-76, I-77, I-80, I-90
I-270, I-470, I-670, I-271, I-471
I-275, I-475, I-675, I-277, I-280, I-480, I-680, I-490

Oklahoma | 930.16 mi.

I-35, I-40, I-44
I-235, I-240, I-244, I-444

Oregon | 727.41 mi.

I-5, I-82, I-84
I-105, I-205, I-405

Pennsylvania | 1,855.31 mi.

I-70, I-76, I-78, I-79, I-80, I-81, I-83, I-84, I-86, I-90, I-95, I-99
I-176, I-276, I-376, I-476, I-576, I-676
I-279, I-579, I-378, I-180, I-380, I-283, I-295

Puerto Rico | 249.77 mi.

I-PR-1, I-PR-2, I-PR-3

Rhode Island | 68.53 mi.

I-95
I-195, I-295

South Carolina | 850.80 mi.

I-20, I-26, I-73, I-74, I-77, I-85, I-95
I-126, I-520, I-526, I-185, I-385, I-585

South Dakota | 678.31 mi.

I-29, I-90
I-229, I-190

Tennessee | 1,959.54 mi.

I-24, I-26, I-40, I-55, I-65, I-69, I-81
I-124, I-140, I-240, I-440, I-640, I-840, I-155, I-265, I-269, I-275, I-181

Texas | 3,501.15 mi.

I-2, I-10, I-14, I-20, I-27, I-30, I-35, I-35E, I-35W, I-37, I-40, I-44, I-45, I-69
I-110, I-410, I-610, I-820, I-635, I-345, I-69C, I-69E, I-69W, I-169, I-369

Utah | 938.00 mi.

I-15, I-70, I-80, I-84
I-215

Vermont | 320.22 mi.

I-89, I-91, I-93
I-189, I-289

Virginia | 1,117.23 mi.

I-64, I-66, I-73, I-77, I-81, I-85, I-95
I-264, I-464, I-564, I-664, I-381, I-581, I-785, I-195, I-295, I-395, I-495, I-895

Washington | 763.67 mi.

I-5, I-82, I-90
I-205, I-405, I-705, I-182

West Virginia | 549.05 mi.

I-64, I-66, I-68, I-70, I-73, I-77, I-79
I-470

Wisconsin | 741.80 mi.

I-39, I-41, I-43, I-90, I-94
I-535, I-794, I-894

Wyoming | 913.60 mi.

I-25, I-80, I-90
I-180

Page Updated February 1, 2018.

An original Interstate era sign directing motorists to the Chicago Skyway and the Northwest Indiana Interstate network. Photo taken by Jeff Royston (05/26/12).

It was determined by the city of Chicago that the Chicago Skyway was never formally included in the Interstate Highway System in 1999. As such, trailblazers were posted in lieu of confirming markers along the toll road.

Oklahoma Veterans Memorial Highway System sign posted at the northbound welcome center near Thackerville. Photo taken 10/10/03.

Interstates are commonly dedicated as war memorial highways throughout the United States. One such designation is the Purple Heart Trail, which originates at a monument in Mt. Vernon, Virginia. Purple Heart Trail routes include I-5 in California, I-35 in Texas and I-95 between Augusta and Holton, Maine.

The south split of Interstate 110 and U.S 54 (Patriot Freeway) in El Paso, Texas. Photo taken 04/25/17.

Prior to 2010, IH 110 was one of a handful of unmarked routes in the Interstate system.