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Table 3: Interstate Routes

Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico
State Number of Interstate Routes Total Miles Net Miles Howard-CramerMiles Section 103(e)(4)(A) Miles ISTEA Miles Overlap Miles Route
Alabama I-10 66.18 66.18 - - - - -
I-20 111.80 111.80 - - - 155.00 I-59
I-22 354.70 354.70 - - - - -
I-59 239.91 155.02 - - - 84.89 I-20
I-65 366.09 366.07 - - - - -
I-85 80.16 80.16 - - - - -
I-165 60.80 4.90 - - - - -
I-359 1.22 2.80 - - - - -
I-459 12.86 33.76 - - - - -
I-565 60.80 22.49 - - - - -
I-759 4.86 4.86 - - - - -
11 Routes 1,359.38 1,202.74 - - 0.00 239.89 -
Alaska A-1 465.75 465.75 - 408.23 - - -
A-2 290.76 290.76 - 202.18 - - -
A-3 323.69 323.69 - 148.12 - - -
3 Routes 1,080.20 1,080.20 - 758.53 - -  
Arizona I-8 178.33 178.33 - - - - -
I-10 392.33 392.33 - - - - -
I-15 29.39 29.39 - - - - -
I-17 201.50 201.50 - - - - -
I-19 4.00 4.00 - - - - -
I-40 359.48 359.48 - - - - -
6 Routes 1,165.03 1,165.03 - - - - -
Arkansas I-30 142.85 142.85 - - - - -
I-40 359.48 359.48 - - - - -
I-49 127.40 127.40 - - 109.81 -  
I-55 69.65 69.65 - - - 2.22 I-40
I-430 6.34 13.75 - - - - -
I-440 60.2 10.11 - 9.96 - - -
I-530 1.22 46.63 - 46.65 - - -
I-540 1.28 14.74 - 5.97 - - -
I-555 4.4 49.94 - - - - -
I-630 7.86 7.86 - - - - -
10 Routes 780.679 842.409 - 62.58 109.81 2.22 -
California I-5 796.53 796.53 - - - - -
I-8 170.1 170.1 - - - - -
I-10 240.94 240.94 - - - 1.6 I-5
I-15 287.25 287.25 - - - - -
I-40 154.45 154.45 - - - - -
I-80 203.07 203.07 - - - - -
I-105 17.64 17.64 7 - - - -
I-110 20.34 20.34 - - - - -
I-205 60.2 60.2 - - - - -
I-210 1.29 1.29 - - - - -
I-215 6.34 6.34 - 55.08 - - -
I-238 60.2 60.2 - 2.17 - - -
I-280 4.4 4.4 - - - - -
I-380 60.2 60.2 - - - - -
I-405 60.8 60.8 - - - - -
I-505 1.29 1.29 - - - - -
I-580 12.86 12.86 -   - - -
I-605 27.96 27.96 - - - - -
I-680 70.49 70.49 - 12.5 - - -
I-710 19.59 19.59 - 19.66 - - -
I-780 7.02 7.02 - - - - -
I-805 28.58 28.58 - - - - -
I-880 46.03 46.03 - 46.03 - - -
I-980 2 2 -   - - -
24 Routes 2,359.57 2,359.57 7 135.44 - 1.6  
Colorado I-25 298.6 298.6 - - - - -
I-70 450.18 450.18 - - - - -
I-76 184 184 - - - - -
I-225 12.46 12.46 - - - - -
I-270 6.61 6.61 - - - - -
5 Routes 951.85 951.85 - - - - -
Connecticut I-84 97.9 97.9 - - - - -
I-91 58 58 - - - - -
I-95 111.57 111.57 - - - - -
I-291 6.02 6.02 - - - - -
I-384 8.2 8.2 - - - - -
I-395 54.69 54.69 - 54.69 - - -
I-684 1.41 1.41 - - - - -
I-691 8.38 8.38 6.69 - - - -
8 Routes 346.17 346.17 6.69 54.69 - - -
Delaware I-95 23.43 23.43 - - - - -
I-295 5.71 5.71 - - - - -
I-495 11.47 11.47 - - - - -
3 Routes 40.61 40.61 - - - - -
District of Columbia I-66 1.01 1.01 - - - - -
I-95 0.13 0.13 - - - - -
I-195 5.04 5.04 - - - - -
I-295 3.47 3.47 - - - - -
I-395 2.18 2.18 - - - - -
5 Routes 11.83 11.83 - - - - -
Florida I-4 131.8 131.8 - - - - -
I-10 362 362 - - - - -
I-75 470.781 470.781 46.31 - - - -
I-95 381.9 381.9 - - - - -
I-110 6.34 6.34 - - - - -
I-175 1.28 1.28 - 1.44 - - -
I-195 4.4 4.4 - - - - -
I-275 60.2 60.2 - - - - -
I-295 60.8 60.8 - 25.53 - - -
I-375 1.22 1.22 - 1.34 - - -
I-395 1.29 1.29 - - - - -
I-595 12.86 12.86 - 8.8 - - -
12 Routes 1,494.87 1,494.87 46.31 37.11 - - -
Georgia I-16 165.7 165.7 - - - - -
I-20 201.5 201.5 - - - - -
I-24 4 4 - - - - -
I-59 20.97 20.97 - - - - -
I-75 354.7 354.7 - - - - -
I-85 171.7 171.7 - - - 8 I-75
I-95 111.8 111.8 - - - - -
I-185 49.6 49.6 - 5.5 - - -
I-285 62.6 62.6 - - - 1.21 I-85
I-475 15.9 15.9 - - - - -
I-516 6.6 6.6 - 6.49 - - -
I-520 15.3 15.3 9.11 - - - -
I-575 31.03 31.03 29.16 - - - -
I-675 11.1 11.1 7.78 - - - -
I-985 23.9 23.9 - 24.04 - - -
15 Routes 1,246.40 1,246.40 46.05 36.03 - 9.21  
Hawaii H-1 27.16 27.16 - - - - -
H-2 8.33 8.33 - - - - -
H-3 15.32 15.32 - - - - -
H-201 4.1 4.1 - 4.1 - - -
4 Routes 54.91 54.91 - 4.1 - - -
Idaho I-15 195.7 195.7 - - - - -
I-84 276.2 276.2 - - - - -
I-86 62.83 62.83 - - - - -
I-90 74.91 74.91 - - - - -
I-184 3.57 3.57 - - - - -
5 Routes 613.21 613.21 - - - - -
Illinois I-24 38.73 38.73 - - - - -
I-39 140 140 - 123.42 - - -
I-41   0 - - - 2.5 I-94
I-55 294.38 294.38 - - - 18.7 I-70, I-64
I-57 358.57 358.57 - - - 5.59 I-70
I-64 123.98 123.98 - - - 4.14 I-57
I-70 138.7 138.7 - - - - -
I-72 177.25 177.25 - 99.1 - - -
I-74 214.88 214.88 - - - 5.89 I-55
I-80 163.52 163.52 - - - - -
I-88 140.6 140.6 - 140.6 - - -
I-90 91.36 91.36 - 16.71 - 15.39 I-94
I-94 59.57 59.57 - - - 2.48 I-80
I-155 32.13 32.13 - 32.13 - - -
I-172 19.69 19.69 - 19.69 - - -
I-180 13.19 13.19 - - - - -
I-190 3.07 3.07 - 3.07 - - -
I-255 27.05 27.05 - - - - -
I-270 14.97 14.97 - - - - -
I-280 8.21 8.21 - - - 9.39 I-74
I-290 29.84 29.84 - - - - -
I-294 48.1 48.1 - - - 5.32 I-80
I-355 32.72 32.72 - 32.51 - - -
I-474 14.88 14.88 - - - - -
24 Routes 2,185.39 2,185.39 - 467.23 - 69.40 -
Indiana I-64 123.33 123.33 - - - - -
I-65 261.27 261.27 - - - - -
I-69 326.18 326.18 - - 126.94 - -
I-70 154.47 154.47 - - - 2.13 I-65
I-74 150.94 150.94 - - - 20.6 I-465
I-80 151.56 151.56 - - - - -
I-90 20.68 20.68 - - - 135.6 I-80
I-94 30.08 30.08 - - - 16.05 I-80
I-164     - - - - -
I-265 6.73 6.73 - - - - -
I-275 3.16 3.16 - - - - -
I-465 42.73 42.73 - 5.03 - - -
I-469 30.83 30.83 - 30.83 - - -
I-865 5.03 5.03 - - - - -
14 Routes 1,306.99 1,306.99 - 35.86 126.94 174.38 -
Iowa I-29 151.93 151.93 - - - 3 I-80
I-35 205.18 205.18 - - - - -
I-74 5.42 5.42 - - - - -
I-80 306.38 306.38 - - - 14.29 I-35
I-129 0.28 0.28 - - - - -
I-235 14.58 14.58 - - - - -
I-280 9.86 9.86 - - - - -
I-380 72.69 72.69 - - - - -
I-480 0.41 0.41 - - - - -
I-680 3.35 3.35          
I-880 17.1 17.1 - - -    
11 Routes 787.18 787.18 - - - 27.2 -
Kansas I-35 235.45 235.45 - - - - -
I-70 423.68 423.68 - - - - -
I-135 96.40 96.40 - - - - -
I-235 16.67 16.67 - - - - -
I-335 50.28 50.28 - 50.13 - - -
I-435 27.99 27.99 - - - - -
I-470 15.37 15.37 - - - - -
I-635 9.28 9.28 - - - - -
I-670 1.74 1.74 - - - - -
9 Routes 874.34 874.34 - 50.13 - - -
Kentucky I-24 93.37 93.37 - - - - -
I-64 185.20 185.20 - - - - -
I-65 137.32 137.32 - - - - -
I-69 111.07 111.07 - - 80.6 - -
I-71 97.42 77.72 - - - 19.7 I-75
I-75 191.78 191.78 - - - - -
I-165 70.19 70.19 - - - - -
I-264 22.93 22.93 - - - - -
I-265 24.48 24.48 - 21.2 - - -
I-275 24.58 24.58 - - - - -
I-471 5.02 5.02 - - - - -
11 Routes 963.36 943.66 - 21.2 80.6 19.7 -
Louisiana I-10 274.67 274.67 - - - - -
I-12 86.65 86.65 - - - - -
I-20 189.87 189.87 - - - - -
I-49 249.92 249.92 153.18 19.55 31 - -
I-55 66.08 66.08 - - - - -
I-59 12.05 12.05 - - - - -
I-61 0.04 0.04          
I-110 9.07 9.07 - - - - -
I-182 0.01 0.01          
I-210 12.73 12.73 - - - - -
I-220 12.57 12.57 - - - - -
I-310 11.7 11.7 - - - - -
I-510 3.4 3.4 - - - - -
I-610 5.05 5.05 - - - - -
I-910 10.53 10.53 - - 9.7 - -
15 Routes 944.34 944.34 153.18 19.55 40.7 - -
Maine I-95 303.11 303.11 - - - - -
I-195 1.53 1.53 - - - - -
I-295 52.51 52.51 - - - - -
I-395 4.77 4.77 - - - - -
I-495 4.36 4.36 - 4.3 - - -
5 Routes 366.28 366.28 - 4.3 - - -
Maryland I-68 81.09 81.09 - 81.09 - - -
I-70 93.62 93.62 - - - - -
I-81 12.08 12.08 - - - - -
I-83 34.5 34.5 - - - - -
I-95 110.01 110.01 - - - - -
I-97 17.62 17.62 14.9 - - - -
I-195 4.35 4.35 2.2 1.04 - - -
I-270 34.4 34.4 - - - - -
I-295 0.8 0.8 - - - - -
I-370 2.54 2.54 1.18 - - - -
I-395 1.98 1.98 - - - - -
I-495 16.13 16.13 - - - - -
I-595 19.97 19.97 19.31 - - - -
I-695 30.57 30.57 - 2.2 - - -
I-795 8.99 8.99 - 5.47 - - -
I-895 11.44 11.44 - - - - -
16 Routes 480.09 480.09 37.59 89.8 - - -
Massachusetts I-84 8.15 8.15 - - - - -
I-90 135.72 135.72 - 2.9 - - -
I-91 54.99 54.99 - - - - -
I-93 47.07 47.07 - 14.1 - - -
I-95 91.95 91.95 - 37.54 - - -
I-190 19.26 19.26 - - - - -
I-195 40.73 40.73 - 14.28 - - -
I-290 20.16 20.16 - - - - -
I-291 5.44 5.44 - - - - -
I-295 4.23 4.23 - - - - -
I-391 4.46 4.46 - - - - -
I-395 11.91 11.91 - 11.91 - - -
I-495 121.56 121.56 12.9 18.5 - - -
13 Routes 565.63 565.63 12.9 99.23 - - -
Michigan I-69 193.1 193.1 - 66.8 - 5.2 I-96
I-75 395.54 395.54 - - - - -
I-94 275.49 275.49 - - - - -
I-96 192.06 192.06 - - - - -
I-194 3.4 3.4 - - - - -
I-196 80.8 80.8 - - - - -
I-275 29.97 29.97 - - - - -
I-296 3.5 3.5 - - - - -
I-375 1.1 1.1 - - - - -
I-475 16.9 16.9 - - - - -
I-496 12.1 12.1 - - - - -
I-675 7.7 7.7 - - - - -
I-696 29.3 29.3 - - - - -
13 Routes 1,240.96 1,240.96 - 66.8 - 5.2 -
Minnesota I-35 301.45 301.45 - - - 39.23 I-35E
I-35E 39.34 39.34 - - - - -
I-35W 41.78 41.78 - - - - -
I-90 275.4 275.4 - - - - -
I-94 259.31 259.31 - - - 0.27 I-35E
I-394 9.74 9.74 - - - - -
I-494 42.82 42.82 - - - - -
I-535 1.58 1.58 - - - - -
I-694 23.1 23.1 - - - 0.65 I-35E
9 Routes 952.88 912.73 - - - 40.15 -
Mississippi I-10 77.19 77.19 - - - - -
I-20 129.41 129.41 - - - 25.2 I-55/59
I-22 106 106 - - 106 - -
I-55 290.41 290.41 - - - - -
I-59 171.72 171.72 - - - - -
I-69 14.7 14.7     14.7 9.2 I-55
I-110 4.1 4.1 - - - - -
I-220 12.01 12.01 - - - - -
I-269 25.93 25.93 - - 25.93 - -
9 Routes 831.47 831.47 - - 146.63 34.4 -
Missouri I-29 128.77 128.77 - . - 5.5 I-35/40
I-35 109.97 109.97 - - - 1 I-70
I-44 293.18 293.18 - - - - -
I-49 177.98 177.98 - - 178.96 - -
I-55 208.89 208.89 - - - 1 I-44
I-57 22.32 22.32 - - - - -
I-64 40.5 40.5 - 40.5 - - -
I-70 249.35 249.35 - - - - -
I-72 2.05 2.05 - 2.04 - - -
I-155 10.72 10.72 - - - - -
I-170 11.13 11.13 - 4.29 - - -
I-229 14.94 14.94 - - - - -
I-255 3.97 3.97 - - - - -
I-270 35.21 35.21 - - - - -
I-435 52.75 52.75 - - - - -
I-470 17.07 17.07 - - - - -
I-635 3.69 3.69 - - - - -
I-670 2.32 2.32 - - - - -
18 Routes 1,384.81 1,384.81 - 46.83 178.96 7.50 -
Montana I-15 396.43 396.43 - - - - -
I-90 544.7 544.7 - - - 7.65 I-15
I-94 249.61 249.61 - - - - -
I-115 1.2 1.2 - - - - -
I-315 0.83 0.83 - - - - -
5 Routes 1,192.77 1,192.77 - - - 7.65 -
Nebraska I-76 2.91 2.91 - - - - -
I-80 455.18 455.18 - - - - -
I-129 3.21 3.21 - - - - -
I-180 3.47 3.47 - - - - -
I-480 4.52 4.52 - - - - -
I-680 13.47 13.47 - - - - -
6 Routes 482.76 482.76 - - - - -
Nevada I-11 22.84 22.84 - - 22.6 - -
I-15 123.76 123.76 - - - - -
I-80 410.45 410.45 - - - - -
I-215 11.7 11.7 - 11.1 - - -
I-515 14.44 14.44 - 14.9 - - -
I-580 35.05 35.05 - 31.239 - - -
6 Routes 618.24 618.24 - 57.239 22.6 - -
New Hampshire I-89 60.86 60.86 - - - - -
I-93 131.64 131.64 - - - - -
I-95 16.13 16.13 - - - - -
I-293 11.77 11.77 - 5.68 - - -
I-393 4.5 4.5 - - - - -
5 Routes 224.9 224.9 - 5.68 - -  
New Jersey I-76 3.09 3.09 - - - - -
I-78 67.84 67.84 - - - - -
I-80 68.55 68.55 - - - - -
I-95 89.23 89.23 - - - - -
I-195 34.16 34.16 27.3 - - - -
I-278 1.98 1.98 - - - - -
I-280 17.84 17.84 - - - - -
I-287 67.54 67.54 - - - - -
I-295 76.56 76.56 - - - - -
I-676 4.72 4.72 - - - - -
10 Routes 431.51 431.51 27.3 - - - -
New Mexico I-10 164.27 164.27 - - - - -
I-25 462.12 462.12 - - - - -
I-40 373.51 373.51 - - - - -
3 Routes 999.9 999.9 - - - -  
New York I-78 0.5 0.5 - - - - -
I-81 183.6 183.6 - - - - -
I-84 71.79 71.79 - - - - -
I-86 216.4 216.4 - - 216.4 - -
I-87 333.49 333.49 - 29.8 - - -
I-88 117.75 117.75 - - - - -
I-90 385.48 385.48 - - - - -
I-95 23.5 23.5 - - - - -
I-99 12.6 12.6 - - 12.6 - -
I-190 28.34 28.34 - - - - -
I-278 33.62 33.62 - - - - -
I-287 11.98 11.98 - - - 19.2 I-87
I-290 9.8 9.8 - - - - -
I-295 7.7 7.7 - - - - -
I-390 76.06 76.06 60.5 - - - -
I-478 2.14 2.14 - 2.14 - - -
I-481 15.04 15.04 - - - - -
I-490 37.4 37.4 - - - - -
I-495 66.38 66.38 - 62.7 - - -
I-587 1.21 1.21 - - - - -
I-590 5.31 5.31 5.31 - - - -
I-678 14.33 14.33 - 7.8 - - -
I-684 27.06 27.06 - - - - -
I-690 14.19 14.19 - - - - -
I-695 1.4 1.4 - - - - -
I-781 4.3 4.3 - 4.3 - - -
I-787 10.16 10.16 - - - - -
I-790 2.41 2.41 - - - - -
I-878 0.7 0.7 - - - - -
I-890 9.35 9.35 - - - - -
I-990 6.35 6.35 - 2.04 - - -
31 Routes 1,730.34 1,730.34 65.81 108.78 229 19.2 -
North Carolina I-26 52.68 52.68 - 13.75 - - -
I-40 420.06 420.06 - 91.4 - - -
I-73 99.97 99.97 - - 99.97 - -
I-74 63.85 63.85 - - 55.86 0.00 I-73
I-77 105.4 105.4 - 5.8 - - -
I-85 203.97 203.97 - - - 31.51 I-40
I-87 13.09 13.09 - - - 2.9 I-440
I-95 181.36 181.36 - - - - -
I-140 19.52 19.52 - 6.8 - - -
I-240 9.54 9.54 - 6.92 - - -
I-277 4.45 4.45 - 1.72 - - -
I-285 23.25 23.25 - - - - -
I-295 22.48 22.48 - - - - -
I-440 14.13 14.13 - 16.77 - - -
I-485 65.61 65.61 - 66.68 - - -
I-540 25.84 25.84 - 25.84 - - -
I-587 37.07 37.07   37.07      
I-785 7.65 7.65 - - - - -
I-795 21.15 21.15 - - -    
I-840 10.63 10.63 - - - 10.37 I-73, I-785
19 Routes 1401.7 1401.7 - 272.75 155.56 44.78  
North Dakota I-29 217.54 217.54 - - - - -
I-94 352.39 352.39 - - - - -
I-194 1.2 1.2 - - - - -
3 Routes 571.13 571.13 - - - - -
Ohio I-70 225.58 225.58 - - - - -
I-71 246.74 246.74 - - - 1.96 I-75/70
I-74 19.73 19.73 - - - - -
I-75 211.28 211.28 - - - - -
I-76 82.26 82.26 - - - - -
I-77 160.89 160.89 - - - - -
I-80 237.11 237.11 - 35 - - -
I-90 102.1 102.1 - - - 142.8 I-80
I-270 54.92 54.92 - - - - -
I-271 40.5 40.5 - - - 5.84 I-480
I-275 52.86 52.86 - - - 3.45 I-74
I-277 4.35 4.35 - - - - -
I-280 12.61 12.61 - - - - -
I-470 6.92 6.92 - - - - -
I-471 0.88 0.88 - - - - -
I-475 20.61 20.61 - - - - -
I-480 44.45 44.45 - - - - -
I-490 2.57 2.57 - - - - -
I-670 10.77 10.77 - - - - -
I-675 27.41 27.41 - - - - -
I-680 16.52 16.52 - - - - -
21 Routes 1,581.06 1,581.06 - 35 - 154.05  
Oklahoma I-35 235.76 235.76 - - - - -
I-40 329.84 329.84 - - - 1.53 I-35
I-44 325.97 325.97 - 114.76 - 4.37 I-35
I-235 5.38 5.38 - 1.54 - - -
I-240 16.5 16.5 - 4.35 - - -
I-244 16.31 16.31 - - - - -
I-335 18.71 18.71          
I-344 30.97 30.97          
I-444 2.86 2.86 - - - - -
9 Routes 982.3 982.3 - 120.65 - 5.9 -
Oregon I-5 308.37 308.37 - - - - -
I-82 11.21 11.21 - - - - -
I-84 375.68 375.68 - 6.89 - - -
I-105 3.49 3.49 - - - - -
I-205 26.56 26.56 - - - - -
I-405 4.25 4.25 - - - - -
6 Routes 727.41 727.41 - 6.89 - - -
Pennsylvania I-70 80.7 80.7 - - - 87.22 I-76
I-76 350.79 350.79 - - - - -
I-78 77.5 77.5 - - - - -
I-79 179.42 179.42 - - - 3.55 I-70
I-80 311.21 311.21 - - - - -
I-81 232.74 232.74 - - - - -
I-83 50.55 50.55 - - - - -
I-84 54.88 54.88 - - - - -
I-86 6.99 6.99 - - 7 - -
I-90 46.37 46.37 - - - - -
I-95 41.53 41.53 - - - - -
I-99 85.75 85.75 - - 85.74 - -
I-176 11.34 11.34 - - - - -
I-180 28.85 28.85 - 28.84 - - -
I-276 30.91 30.91 - - - - -
I-279 13.29 13.29 - - - - -
I-283 2.9 2.9 - - - - -
I-376 84.66 84.66 - - - - -
I-380 24.46 24.46 - - - - -
I-476 131.5 131.5 - 110 - - -
I-579 1.55 1.55 - - - - -
I-676 2.89 2.89 - - - - -
22 Routes 1,850.78 1,850.78 - 138.84 92.74 90.77 -
Puerto Rico PRI-1 71.08 71.08 - 71.08 - - -
PRI-2 138.13 138.13 - 138.13 - - -
PRI-3 40.56 40.56 - 40.56 - - -
3 Routes 249.77 249.77 - 249.77 - - -
Rhode Island I-95 43.3 43.3 - - - - -
I-195 3.57 3.57 - - - - -
I-295 23.12 23.12 - - - - -
3 Routes 68.53 68.53 - - - - -
South Carolina I-20 141.51 141.51 - - - - -
I-26 220.93 220.93 - - - - -
I-77 91.04 91.04 - 9.5 - - -
I-85 106.28 106.28 - - - - -
I-95 198.76 198.76 - - - - -
I-126 3.68 3.68 - - - - -
I-185 16.4 16.4 - 14.5 - - -
I-385 42.16 42.16 - 36 - - -
I-520 7.99 7.99 - - - - -
I-526 19.56 19.56 - 11.2 - - -
I-585 2.25 2.25 - - - - -
11 Routes 850.56 850.56 - 71.2 - -  
South Dakota I-29 252.5 252.5 - - - - -
I-90 412.75 412.75 - - - - -
I-190 2.06 2.06 - - - - -
I-229 11.38 11.38 - - - - -
4 Routes 678.31 678.31 - - - - -
Tennessee I-24 178.25 178.25 - - - 2.2 I-40/65
I-26 54.45 54.45 - 54.45 - - -
I-40 455.41 455.41 - 1 - - -
I-55 12.28 12.28 - - - - -
I-65 120.12 120.12 - - - 1 I-40
I-69 0 0 - - -   I-55,I-240, I-40
I-75 142.19 142.19 - - - 19.6 I-40
I-81 75.64 75.64 - - - - -
I-124 1.925 1.925 - - - - -
I-140 11.19 11.19 - 11.17 - - -
I-155 15.94 15.94 - - - - -
I-240 19.98 19.98 - - - - -
I-269 19.17 19.17     19.2    
I-275 2.98 2.98 - - - - -
I-440 7.66 7.66 - - - - -
I-640 7.04 7.04 - - - - -
I-840 77.28 77.28 - - - - -
17 Routes 1,201.51 1,201.51 - 66.62 - 22.80 -
Texas I-2 46.8 46.8 - - - - -
I-10 881 878.61 - - - 2.39 I-35
I-14 25.1 25.1     25.1    
I-20 636.08 636.08 - 2 - - -
I-27 124.13 124.13 - 12.9 - - -
I-30 223.74 223.74 - 29.93 - - -
I-35 504.15 407.2 - - - 96.95 I-35E
I-35E 96.95 96.95 - - - - -
I-35W 85.2 85.2 - - - - -
I-37 143 143 - - - - -
I-40 177.1 177.1 - - - - -
I-44 14.77 14.77 - 14.77 - - -
I-45 284.91 284.91 - - - - -
I-69 110.3 110.3 - - 110.3 - -
I-69C 18 18 - - 18 - -
I-69E 61.1 61.1 - - 61.1 - -
I-69W 1.4 1.4     1.4    
I-110 0.92 0.92 - - - - -
I-169 4 4 - - 4 - -
I-345 1.4 1.4 - - - - -
I-369 3.5 3.5 - - 3.5 - -
I-410 49.49 49.49 - 9.93 - - -
I-610 37.97 37.97 - - - - -
I-635 37 37 - - - - -
I-820 35.17 35.17 - - - - -
25 Routes 3,603.18 3,503.84 - 69.53 223.40 99.34 -
Utah I-15 400.6 400.6 - - - - -
I-70 231.7 231.7 - - - - -
I-80 197.51 194.2 - - - 3.31 I-15
I-84 117.38 81.4 - - - 35.98 I-15
I-215 28.9 28.9 - - - - -
5 Routes 976.09 936.8 - - - 39.29 -
Vermont I-89 130.25 130.25 - - - - -
I-91 177.43 177.43 - - - - -
I-93 11.1 11.1 - - - - -
I-189 1.48 1.48 - - - - -
4 Routes 320.22 320.22 - - - - -
Virginia I-64 267.31 267.31 - - - 30.4 I-81
I-66 74.77 74.77 - - - - -
I-77 60.04 60.04 - - - 8.8 I-81
I-81 324.92 324.92 - - - - -
I-85 69.12 69.12 - - - - -
I-95 178.25 178.25 - 24.08 - - -
I-195 3.5 3.5 - - - - -
I-264 25.07 25.07 - 12 - - -
I-295 52.96 52.96 - - - - -
I-381 1.39 1.39 - - - - -
I-395 10.53 10.53 - - - - -
I-464 5.67 5.67 - - - - -
I-495 15.36 15.36 - - - - -
I-564 2.77 2.77 - - - - -
I-581 6.64 6.64 - - - - -
I-664 20.57 20.57 - 9.2 - - -
16 Routes 1,156.43 1,117.23 - 45.28 - 39.2 -
Washington I-5 276.54 276.54 - - - - -
I-82 132.57 132.57 - - - - -
I-90 296.91 296.91 - - - - -
I-182 15.19 15.19 - - - - -
I-205 10.57 10.57 - - - - -
I-405 30.3 30.3 - - - - -
I-705 1.5 1.5 - - - - -
7 Routes 763.58 763.58 - - - - -
West Virginia I-64 124.87 124.87 - - - 63.88 I-77
I-68 32.06 32.06 - 32.06 - - -
I-70 14.45 14.45 - - - - -
I-77 197.21 197.21 - - - - -
I-79 160.52 160.52 - - - - -
I-81 26 26 - - - - -
I-470 3.94 3.94 - - - - -
7 Routes 559.05 559.05 - 32.06 - 63.88 -
Wisconsin I-39 182.72 182.72 - 104 - - -
I-41 132 132 - - 132 40.5 I-94, I-43, I-894
I-43 191.55 191.55 - 63 - - -
I-90 108.61 108.61 - - - - -
I-94 249.26 249.26 - - - 91.76 I-90
I-535 1.21 1.21 - - - - -
I-794 3.75 3.75 - - - - -
I-894 4.7 4.7 - - - - -
7 Routes 873.8 873.8 - 167 - 91.76 -
Wyoming I-25 300.95 300.95 - - - - -
I-80 402.59 402.59 - - - - -
I-90 208.74 208.74 - - - - -
I-180 1.12 1.12 - - - - -
4 Routes 913.4 913.4 - - - - -

 

Notes:

  • Total Miles - this column includes the original 42,500 miles under former 23 USC 103(e)(1) & (3) plus the Howard-Cramer additions under former 23 USC 103(e)(2) and additions under 23 USC 103(c)(4)(A) and high priority routes per 1991 ISTEA. It also includes mileage sections which overlap other Interstate routes.
  • Net Miles - this column does not include overlapping mileage.
  • Howard-Cramer Miles - this column shows mileage added to the system under former 23 USC 103(e)(2).
  • Section 103(c)(4)(A) Miles - this column shows mileage added to the system under 23 USAC 103(c)(4)(A).
  • It supersedes 23 USC 139(a) & 139(c).
  • ISTEA Miles - this column shows the miles added under Sec. 1105(e)(5), ISTEA.
  • Overlap Miles - mileage shown in this column is included in the Total Length of each overlapped route.
  • Routes shown are those routes designated as of December 31, 2024
Summary: As of December 31, 2024
State Number of Interstate Routes Total Miles Net Miles Howard-CramerMiles Section 103(e)(4)(A) Miles ISTEA Miles Overlap Miles
Alabama 11 1,359.38 1,202.74 - - 0.00 239.89
Alaska 3 1,080.20 1,080.20 - 1,082.22 - -
Arizona 6 1,165.03 1,168.64 - - - -
Arkansas 10 780.679 842.409 - 62.58 109.81 2.22
California 24 2,359.57 2,455.74 7 144.41 - 1.6
Colorado 5 951.85 951.85 - - - -
Connecticut 8 346.17 346.17 6.69 54.69 - -
Delaware 3 40.61 40.61 - - - -
District of Columbia 5 11.83 11.83 - - - -
Florida 12 1,494.87 1,494.87 46.31 37.11 - -
Georgia 15 1,246.40 1,246.40 46.05 36.03 - 9.21
Hawaii 4 54.91 54.91 - 4.1 - -
Idaho 5 613.21 613.21 - - - -
Illinois 24 2,185.39 2,185.39 - 467.23 - 69.40
Indiana 14 1,306.99 1,306.99 - 35.86 126.94 174.38
Iowa 11 787.18 787.18 - - - 27.2
Kansas 9 874.34 874.34 0 50.13 - -
Kentucky 11 963.36 943.66 - 21.2 80.6 19.7
Louisiana 15 944.34 944.34 153.18 19.55 40.7 -
Maine 5 366.28 366.28 - 4.3 - -
Maryland 16 480.09 480.09 37.59 90.16 - -
Massachusetts 13 565.63 565.63 12.9 99.23 - -
Michigan 13 1,240.96 1,240.96 - 66.8 - 5.2
Minnesota 9 952.88 912.73 - - - 40.15
Mississippi 9 831.47 831.47 - - 146.63 34.4
Missouri 18 1,384.81 1,384.81 - 46.83 178.96 7.50
Montana 5 1,192.77 1,192.77 - - - 7.65
Nebraska 6 482.76 482.76 - - - -
Nevada 6 618.24 618.24 - 57.239 22.6 -
New Hampshire 5 224.9 224.9 - 5.68 - -
New Jersey 10 431.51 431.51 27.3 - - -
New Mexico 3 999.9 999.9 - - - -
New York 31 1,730.34 1,730.34 65.81 108.78 229.00 19.20
North Carolina 19 1,401.70 1,401.70 - 272.75 155.83 44.78
North Dakota 3 571.13 571.13 - - - -
Ohio 21 1,581.06 1,581.06 - 35 - 154.05
Oklahoma 9 982.3 982.3 - 120.65 - 5.9
Oregon 6 727.41 727.41 - 6.89 - -
Pennsylvania 22 1,850.78 1,850.78 - 138.84 92.74 90.77
Puerto Rico 3 249.77 249.77 - 249.77 - -
Rhode Island 3 68.53 68.53 - - - -
South Carolina 11 850.56 850.56 - 71.2 - -
South Dakota 4 678.31 678.31 - - - -
Tennessee 17 1,201.51 1,201.51 - 66.62 - 22.80
Texas 25 3,603.18 3,503.84 - 69.53 223.40 99.34
Utah 5 976.09 936.8 - - - 39.29
Vermont 4 320.22 320.22 - - - -
Virginia 16 1,156.43 1,117.23 - 45.28 - 39.2
Washington 7 763.58 763.58 - - - -
West Virginia 7 559.05 559.05 - 32.06 - 63.88
Wisconsin 7 873.8 873.8 - 167 - 91.76
Wyoming 4 913.4 913.4 - - - -
Totals: 537 49,397.66 49,164.87 402.83 3,769.72 1,406.94 1,0309.47

 

Updated: 2/18/2025
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