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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 Interstate Route Total Miles Net Miles Howard-Cramer Miles Sections 103(c)(4)(A) Miles ISTEA Miles Overlap Miles & Route
Alabama I-10 66.31 66.31 - - - - -
I-20 214.7 84.6 - - - 130.1 I-59
I-22 96.22 96.22 - - 96.22 - -
I-59 241.36 241.36 - - - - -
I-65 367 367 - - - - -
I-85 80 80 - - - - -
I-165 4.9 4.9 - - - - -
I-359 2.3 2.3 - - - - -
I-459 32.8 32.8 - - - - -
I-565 21.4 21.4 - - - - -
I-685 14 0 - - - 14 I-85
I-759 4.5 4.5 - - - - -
12 Routes 1,145.49 1,001.39 - - 96.22 144.10 -
Alaska A-1 408.23 408.23 - 408.23 - - -
A-2 202.18 202.18 - 202.18 - - -
A-3 148.12 148.12 - 148.12 - - -
A-4 323.69 323.69 - 323.69 - - -
4 Routes 1,082.22 1,082.22 - 1,082.22 - -  
Arizona I-8 178.33 178.33 - - - - -
I-10 392.33 392.33 - - - - -
I-15 29.39 29.39 - - - - -
I-17 145.76 145.76 - - - - -
I-19 63.35 63.35 - - - - -
I-40 359.48 359.48 - - - - -
6 Routes 1,168.64 1,168.64 - - - - -
Arkansas I-30 143.02 143.02 - - - - -
I-40 284.69 284.69 - - - - -
I-49 109.81 109.81 - - 109.81 -  
I-55 72.22 70 - - - 2.22 I-40
I-430 12.93 12.93 - - - - -
I-440 9.96 9.96 - 9.96 - - -
I-530 46.65 46.65 - 46.65 - - -
I-540 15.87 15.87 - 5.97 - - -
I-555 44.57 44.57 - - - - -
I-630 7.4 7.4 - - - - -
10 Routes 747.12 744.9 - 62.58 109.81 2.22 -
California I-5 796.53 796.53 - - - - -
I-8 169.92 169.92 - - - - -
I-10 242.54 240.94 - - - 1.6 I-5
I-15 287.26 287.26 - - - - -
I-40 154.61 154.61 - - - - -
I-80 199.24 199.24 - - - - -
I-105 17.32 17.32 7 - - - -
I-110 20.43 20.43 - - - - -
I-205 12.97 12.97 - - - - -
I-210 48.72 48.72 - - - - -
I-215 54.5 54.5 - 54.5 - - -
I-238 2.23 2.23 - 2.23 - - -
I-280 57.22 57.22 - - - - -
I-305 6 6 - - - - -
I-380 3.3 3.3 - - - - -
I-405 72.15 72.15 - - - - -
I-505 32.98 32.98 - - - - -
I-580 75.63 75.63 - 7.3 - - -
I-605 27.4 27.4 - - - - -
I-680 70.52 70.52 - 12.5 - - -
I-710 19.66 19.66 - 19.66 - - -
I-780 6.5 6.5 - - - - -
I-805 28.02 28.02 - - - - -
I-880 47.22 47.22 - 47.22 - - -
I-980 2.03 2.03 - 1 - - -
25 Routes 2,457.34 2,455.74 7 144.41 - 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 1.48 1.48 - - - - -
I-95 0.11 0.11 - - - - -
I-295 5.2 5.2 - - - - -
I-395 3.48 3.48 - - - - -
I-695 2 2 - - - - -
5 Routes 12.27 12.27 - - - - -
Florida I-4 132.3 132.3 - - - - -
I-10 362.28 362.28 - - - - -
I-75 470.88 470.88 46.31 - - - -
I-95 382.15 382.15 - - - - -
I-110 6.94 6.94 - - - - -
I-175 1.44 1.44 - 1.44 - - -
I-195 4.42 4.42 - - - - -
I-275 60.64 60.64 - - - - -
I-295 61.04 61.04 - 25.53 - - -
I-375 1.34 1.34 - 1.34 - - -
I-395 1.29 1.29 - - - - -
I-595 12.86 12.86 - 8.8 - - -
12 Routes 1,497.58 1,497.58 46.31 37.11 - - -
Georgia I-16 166.81 166.81 - - - - -
I-20 202.61 202.61 - - - - -
I-24 4.1 4.1 - - - - -
I-59 20.67 20.67 - - - - -
I-75 355.11 355.11 - - - - -
I-85 179.9 171.9 - - - 8 I-75
I-95 112 112 - - - - -
I-185 49.3 49.3 - 5.5 - - -
I-285 63.98 62.77 - - - 1.21 I-85
I-475 15.83 15.83 - - - - -
I-516 6.49 6.49 - 6.49 - - -
I-520 10.34 10.34 9.11 - - - -
I-575 30.97 30.97 29.16 - - - -
I-675 11.04 11.04 7.78 - - - -
I-985 24.04 24.04 - 24.04 - - -
15 Routes 1,253.19 1,243.98 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-15 196 196 - - - - -
I-84 275.74 275.74 - - - - -
I-86 62.85 62.85 - - - - -
I-90 73.55 73.55 - - - - -
I-184 3.62 3.62 - - - - -
5 Routes 611.76 611.76 - - - - -
Illinois I-24 38.73 38.73 - - - - -
I-39 123.42 123.42 - 123.42 - - -
I-41 2.5 0 - - - 2.5 I-94
I-55 313.08 294.38 - - - 18.7 I-70, I-64
I-57 364.16 358.57 - - - 5.59 I-70
I-64 128.12 123.98 - - - 4.14 I-57
I-70 135.74 135.74 - - - - -
I-72 177.25 177.25 - 99.1 - - -
I-74 220.34 214.45 - - - 5.89 I-55
I-80 163.52 163.52 - - - - -
I-88 140.6 140.6 - 140.6 - - -
I-90 123.89 108.5 - 16.71 - 15.39 I-94
I-94 61.53 59.05 - - - 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 17.6 8.21 - - - 9.39 I-74
I-290 29.84 29.84 - - - - -
I-294 53.42 48.1 - - - 5.32 I-80
I-355 32.51 32.51 - 32.51 - - -
I-474 14.88 14.88 - - - - -
24 Routes 2,251.23 2,181.83 - 467.23 - 69.40 -
Indiana I-64 123.33 123.33 - - - - -
I-65 261.27 261.27 - - - - -
I-69 273.47 273.47 - - 95.47 - -
I-70 156.6 154.47 - - - 2.13 I-65
I-74 171.54 150.94 - - - 20.6 I-465
I-80 151.56 151.56 - - - - -
I-90 156.28 20.68 - - - 135.6 I-80
I-94 46.13 30.08 - - - 16.05 I-80
I-164 21.24 21.24 - - - - -
I-265 6.73 6.73 - - - - -
I-275 3.16 3.16 - - - - -
I-465 52.73 52.73 - 5.03 - - -
I-469 30.83 30.83 - 30.83 - - -
I-865 5.03 5.03 - - - - -
14 Routes 1,459.90 1,285.52 - 35.86 95.47 174.38 -
Iowa I-29 154.75 151.75 - - - 3 I-80
I-35 218.33 218.33 - - - - -
I-74 5.36 5.36 - - - - -
I-80 303.23 288.94 - - - 14.29 I-35
I-129 0.27 0.27 - - - - -
I-235 13.78 13.78 - - - - -
I-280 9.38 9.38 - - - - -
I-380 73.05 73.05 - - - - -
I-480 0.75 0.75 - - - - -
I-680 29.54 19.63 - - - 9.91 I-29
10 Routes 808.44 781.24 - - - 27.2 -
Kansas I-35 235.51 235.51 - - - - -
I-70 424.15 424.15 - - - - -
I-135 95.74 95.74 - - - - -
I-235 16.52 16.52 - - - - -
I-335 50.13 50.13 - 50.13 - - -
I-435 28.03 28.03 - - - - -
I-470 13.72 13.72 - - - - -
I-635 8.9 8.9 - - - - -
I-670 1.64 1.64 - - - - -
9 Routes 874.34 874.34 - 50.13 - - -
Kentucky I-24 93.37 93.37 - - - - -
I-64 185.2 185.2 - - - - -
I-65 137.32 137.32 - - - - -
I-69 80.6 80.6 - - 80.6 - -
I-71 97.42 77.72 - - - 19.7 I-75
I-75 191.78 191.78 - - - - -
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 - - - - -
10 Routes 862.7 843 - 21.2 80.6 19.7 -
Louisiana I-10 274.42 274.42 - - - - -
I-12 85.59 85.59 - - - - -
I-20 189.87 189.87 - - - - -
I-49 239.25 239.25 153.18 19.55 31 - -
I-55 65.81 65.81 - - - - -
I-59 11.48 11.48 - - - - -
I-110 8.89 8.89 - - - - -
I-210 12.4 12.4 - - - - -
I-220 17.62 17.62 - - - - -
I-310 11.25 11.25 - - - - -
I-510 3.04 3.04 - - - - -
I-610 4.52 4.52 - - - - -
I-910 9.7 9.7 - - 9.7 - -
13 Routes 933.84 933.84 153.18 19.55 40.7 - -
Maine I-95 298.51 298.51 - - - - -
I-195 1.55 1.55 - - - - -
I-295 11.02 11.02 - - - - -
I-395 4.99 4.99 - - - - -
I-495 50.47 50.47 - 50.47 - - -
5 Routes 366.54 366.54 - 50.47 - - -
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-69 198.51 193.31 - 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 3.38 3.38 - - - - -
I-196 80.65 80.65 - - - - -
I-275 29.97 29.97 - - - - -
I-296 3.43 3.43 - - - - -
I-375 1.06 1.06 - - - - -
I-475 16.99 16.99 - - - - -
I-496 11.78 11.78 - - - - -
I-675 7.72 7.72 - - - - -
I-696 29.39 29.39 - - - - -
13 Routes 1,245.97 1,240.77 - 66.8 - 5.2 -
Minnesota I-35 259.69 220.46 - - - 39.23 I-35E
I-35E 39.34 39.34 - - - - -
I-35W 41.78 41.78 - - - - -
I-90 275.7 275.7 - - - - -
I-94 259.49 259.22 - - - 0.27 I-35E
I-394 9.75 9.75 - - - - -
I-494 42.94 42.94 - - - - -
I-535 1.57 1.57 - - - - -
I-694 22.62 21.97 - - - 0.65 I-35E
9 Routes 952.88 912.73 - - - 40.15 -
Mississippi I-10 77.19 77.19 - - - - -
I-20 154.61 129.41 - - - 25.2 I-55/59
I-22 106 106 - - 106 - -
I-55 290.41 290.41 - - - - -
I-59 171.72 171.72 - - - - -
I-69 23.9 14.7     14.7 9.2 I-55
I-110 4.1 4.1 - - - - -
I-220 12.01 12.01 - - - - -
8 Routes 839.94 805.54 - - 120.7 34.4 -
Missouri I-29 130.72 125.22 - - - 5.5 I-35/40
I-35 114.74 113.74 - - - 1 I-70
I-44 293.39 293.39 - - - - -
I-49 178.96 178.96 - - 178.96 - -
I-55 210.45 209.45 - - - 1 I-44
I-57 21.96 21.96 - - - - -
I-64 40.5 40.5 - 40.5 - - -
I-70 250.16 250.16 - - - - -
I-72 2.04 2.04 - 2.04 - - -
I-155 10.84 10.84 - - - - -
I-170 11.17 11.17 - 4.29 - - -
I-229 14.97 14.97 - - - - -
I-255 3.77 3.77 - - - - -
I-270 35.62 35.62 - - - - -
I-435 52.78 52.78 - - - - -
I-470 16.72 16.72 - - - - -
I-635 3.77 3.77 - - - - -
I-670 1.17 1.17 - - - - -
18 Routes 1,393.73 1,386.23 - 46.83 178.96 7.50 -
Montana I-15 396.03 396.03 - - - - -
I-90 551.68 544.03 - - - 7.65 I-15
I-94 249.15 249.15 - - - - -
I-115 1.19 1.19 - - - - -
I-315 0.83 0.83 - - - - -
5 Routes 1,198.88 1,191.23 - - - 7.65 -
Nebraska I-76 2.48 2.48 - - - - -
I-80 455.32 455.32 - - - - -
I-129 3.21 3.21 - - - - -
I-180 3.18 3.18 - - - - -
I-480 4.15 4.15 - - - - -
I-680 13.32 13.32 - - - - -
6 Routes 481.66 481.66 - - - - -
Nevada I-15 123.77 123.77 - - - - -
I-80 410.67 410.67 - - - - -
I-215 11.1 11.1 - 11.1 - - -
I-515 20.54 20.54 - 14.9 - - -
I-580 35.109 35.109 - 31.239 - - -
5 Routes 601.189 601.189 - 57.239 - - -
New Hampshire I-89 60.87 60.87 - - - - -
I-93 131.78 131.78 - - - - -
I-95 16.11 16.11 - - - - -
I-293 11.18 11.18 - 5.68 - - -
I-393 4.6 4.6 - - - - -
5 Routes 224.54 224.54 - 5.68 - -  
New Jersey I-76 3.04 3.04 - - - - -
I-78 67.83 67.83 - - - - -
I-80 68.35 68.35 - - - - -
I-95 97.76 97.76 - - - - -
I-195 34.17 34.17 27.3 - - - -
I-278 2 2 - - - - -
I-280 17.85 17.85 - - - - -
I-287 67.54 67.54 - - - - -
I-295 68.06 68.06 - - - - -
I-676 4.75 4.75 - - - - -
10 Routes 431.36 431.36 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 31.18 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-895 1.12 1.12 - - - - -
I-990 6.35 6.35 - 2.04 - - -
32 Routes 1,750.66 1,731.46 65.81 108.78 229 19.2 -
North Carolina I-26 52.69 52.69 - 13.75 - - -
I-40 419.4 420.21 - 91.4 - - -
I-73 80.85 80.85 - - 80.85 3.56 I-840
I-74 72.12 55.86 - - 72.12 16.26 I-73
I-77 105.5 105.5 - 5.8 - - -
I-85 231.23 204.81 - - - 31.51 I-40
I-87 12.9 10 - - - 2.9 I-440
I-95 181.36 181.36 - - - - -
I-140 6.79 6.79 - 6.8 - - -
I-240 9.54 9.54 - 6.92 - - -
I-277 4.46 4.46 - 1.72 - - -
I-440 16.77 16.77 - 16.77 - 2.9 I-87
I-485 66.68 66.68 - 66.68 - - -
I-495 4.1 4.1 - 4.1 - - -
I-540 25.84 25.84 - 25.84 - - -
I-785 2.21 - - - - 2,21 I-840
I-795 25.46 25.46 - - -    
I-840 5.77 2.21 - - - 5.77 I-73, I-785
18 Routes 1323.67 1273.13 - 239.78 152.97 62.9  
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-70 225.6 225.6 - - - - -
I-71 248.15 246.19 - - - 1.96 I-75/70
I-74 19.47 19.47 - - - - -
I-75 211.3 211.3 - - - - -
I-76 81.65 81.65 - - - - -
I-77 160.13 160.13 - - - - -
I-80 237.48 237.48 - 35 - - -
I-90 244.75 101.95 - - - 142.8 I-80
I-270 54.97 54.97 - - - - -
I-271 46.06 40.22 - - - 5.84 I-480
I-275 55.97 52.52 - - - 3.45 I-74
I-277 4.14 4.14 - - - - -
I-280 12.41 12.41 - - - - -
I-470 6.69 6.69 - - - - -
I-471 0.73 0.73 - - - - -
I-475 20.37 20.37 - - - - -
I-480 41.77 41.77 - - - - -
I-490 2.43 2.43 - - - - -
I-670 9.37 9.37 - - - - -
I-675 26.53 26.53 - - - - -
I-680 16.43 16.43 - - - - -
21 Routes 1,726.40 1,572.35 - 35 - 154.05  
Oklahoma I-35 235.96 235.96 - - - - -
I-40 331.73 330.2 - - - 1.53 I-35
I-44 328.53 324.16 - 114.76 - 4.37 I-35
I-235 5.36 5.36 - 1.54 - - -
I-240 16.22 16.22 - 4.35 - - -
I-244 15.75 15.75 - - - - -
I-444 2.51 2.51 - - - - -
7 Routes 936.06 930.16 - 120.65 - 5.9 -
Oregon I-5 308.14 308.14 - - - - -
I-82 11.01 11.01 - - - - -
I-84 375.17 375.17 - 6.89 - - -
I-105 3.49 3.49 - - - - -
I-205 26.07 26.07 - - - - -
I-405 3.53 3.53 - - - - -
6 Routes 727.41 727.41 - 6.89 - - -
Pennsylvania I-70 167.92 80.7 - - - 87.22 I-76
I-76 350.97 350.97 - - - - -
I-78 77.95 77.95 - - - - -
I-79 182.94 179.39 - - - 3.55 I-70
I-80 311.12 311.12 - - - - -
I-81 232.76 232.76 - - - - -
I-83 50.53 50.53 - - - - -
I-84 54.87 54.87 - - - - -
I-86 7 7 - - 7 - -
I-90 46.3 46.3 - - - - -
I-95 51.01 51.01 - - - - -
I-99 85.74 85.74 - - 85.74 - -
I-176 11.33 11.33 - - - - -
I-180 28.84 28.84 - 28.84 - - -
I-276 32.28 32.28 - - - - -
I-279 13.32 13.32 - - - - -
I-283 2.91 2.91 - - - - -
I-376 78.7 78.7 - - - - -
I-380 24.45 24.45 - - - - -
I-476 130.25 130.25 - 110 - - -
I-579 2.73 2.73 - - - - -
I-676 2.16 2.16 - - - - -
22 Routes 1,946.08 1,855.31 - 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 42.36 42.36 - - - - -
I-195 3.82 3.82 - - - - -
I-295 22.35 22.35 - - - - -
3 Routes 68.53 68.53 - - - - -
South Carolina I-20 141.51 141.51 - - - - -
I-26 220.95 220.95 - - - - -
I-77 91.05 91.05 - 9.5 - - -
I-85 106.28 106.28 - - - - -
I-95 198.76 198.76 - - - - -
I-126 3.68 3.68 - - - - -
I-185 17.7 17.7 - 14.5 - - -
I-385 42.16 42.16 - 36 - - -
I-520 7.2 7.2 - - - - -
I-526 19.26 19.26 - 11.2 - - -
I-585 2.25 2.25 - - - - -
11 Routes 850.8 850.8 - 71.2 - -  
South Dakota I-29 252.5 252.5 - - - - -
I-90 412.76 412.76 - - - - -
I-190 1.72 1.72 - - - - -
I-229 11.33 11.33 - - - - -
4 Routes 678.31 678.31 - - - - -
Tennessee I-24 180.16 177.96 - - - 2.2 I-40/65
I-26 31 31 - 31 - - -
I-40 455.28 455.28 - - - - -
I-55 12.28 12.28 - - - - -
I-65 121.71 120.71 - - - 1 I-40
I-69 14 850.8 - - - 14 I-55,I-240, I-40
I-75 161.86 142.26 - - - 19.6 I-40
I-81 75.66 75.66 - - - - -
I-124 1.97 1.97 - - - - -
I-140 11.17 11.17 - 11.17 - - -
I-155 15.93 15.93 - - - - -
I-181 8.4 8.4 - 8.4 - - -
I-240 19.27 19.27 - - - - -
I-269 19.2 19.2     19.2    
I-275 2.98 2.98 - - - - -
I-440 7.64 7.64 - - - - -
I-640 7.03 7.03 - - - - -
I-840 77 77 - - - - -
18 Routes 1,145.54 1,959.54 - 50.57 - 36.80 -
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 96.76 96.76 - - - - -
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 1.5 1.5 - - 1.5 - -
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 3,600.49 3,501.15 - 69.53 220.90 99.34 -
Utah I-15 401.07 401.07 - - - - -
I-70 232.15 232.15 - - - - -
I-80 196.34 193.03 - - - 3.31 I-15
I-84 118.71 82.73 - - - 35.98 I-15
I-215 29.02 29.02 - - - - -
5 Routes 977.29 938 - - - 39.29 -
Vermont I-89 130.25 130.25 - - - - -
I-91 177.38 177.38 - - - - -
I-93 11.1 11.1 - - - - -
I-189 1.49 1.49 - - - - -
4 Routes 320.22 320.22 - - - - -
Virginia I-64 297.62 267.22 - - - 30.4 I-81
I-66 74.8 74.8 - - - - -
I-77 69.4 60.6 - - - 8.8 I-81
I-81 324.92 324.92 - - - - -
I-85 68.64 68.64 - - - - -
I-95 178.73 178.73 - 24.08 - - -
I-195 3.24 3.24 - - - - -
I-264 25.07 25.07 - 12 - - -
I-295 52.56 52.56 - - - - -
I-381 1.67 1.67 - - - - -
I-395 9.91 9.91 - - - - -
I-464 4.71 4.71 - - - - -
I-495 15.28 15.28 - - - - -
I-564 3.03 3.03 - - - - -
I-581 6.64 6.64 - - - - -
I-664 20.21 20.21 - 9.2 - - -
16 Routes 1,156.43 1,117.23 - 45.28 - 39.2 -
Washington I-5 276.62 276.62 - - - - -
I-82 132.57 132.57 - - - - -
I-90 296.92 296.92 - - - - -
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 763.67 763.67 - - - - -
West Virginia I-64 188.75 124.87 - - - 63.88 I-77
I-68 32.06 32.06 - 32.06 - - -
I-70 14.45 14.45 - - - - -
I-77 187.21 187.21 - - - - -
I-79 160.52 160.52 - - - - -
I-81 26 26 - - - - -
I-470 3.94 3.94 - - - - -
7 Routes 612.93 549.05 - 32.06 - 63.88 -
Wisconsin I-39 182.72 182.72 - 104 - - -
I-41 172.5 132 - - 132 40.5 I-94, I-43, I-894
I-43 191.55 191.55 - 63 - - -
I-90 108.61 108.61 - - - - -
I-94 341.02 249.26 - - - 91.76 I-90
I-535 1.21 1.21 - - - - -
I-794 3.75 3.75 - - - - -
I-894 4.7 4.7 - - - - -
7 Routes 833.56 741.8 - 167 - 91.76 -
Wyoming I-25 300.95 300.95 - - - - -
I-80 402.76 402.76 - - - - -
I-90 208.8 208.8 - - - - -
I-180 1.09 1.09 - - - - -
4 Routes 913.6 913.6 - - - - -
Note:                
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, 2017
Summary: As of December 31, 2017
State Number of Total Net Howard- Section ISTEA Overlap
Interstate Miles Miles Cramer 103(e)(4)(A) Miles Miles
Routes     Miles Miles    
Alabama 12 1,145.49 1,001.39 - - 96.22 144.10
Alaska 4 1,082.22 1,082.22 - 1,082.22 - -
Arizona 6 1,168.64 1,168.64 - - - -
Arkansas 10 747.12 744.9 - 62.58 109.81 2.22
California 25 2,457.34 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 12.27 12.27 - - - -
Florida 12 1,497.58 1,497.58 46.31 37.11 - -
Georgia 15 1,253.19 1,243.98 46.05 36.03 - 9.21
Hawaii 4 54.91 54.91 - 4.1 - -
Idaho 5 611.76 611.76 - - - -
Illinois 24 2,251.23 2,181.83 - 467.23 - 69.40
Indiana 14 1,459.90 1,285.52 - 35.86 95.47 174.38
Iowa 10 808.44 781.24 - - - 27.2
Kansas 9 874.34 874.34 0 50.13 - -
Kentucky 10 862.7 843 - 21.2 80.6 19.7
Louisiana 13 902.84 902.84 153.18 19.55 9.7 -
Maine 5 366.54 366.54 - 50.47 - -
Maryland 16 481.04 481.04 37.59 90.16 - -
Massachusetts 13 565.63 565.63 12.9 99.23 - -
Michigan 13 1,245.97 1,240.77 - 66.8 - 5.2
Minnesota 9 952.88 912.73 - - - 40.15
Mississippi 8 839.94 805.54 - - 120.7 34.4
Missouri 18 1,393.73 1,386.23 - 46.83 178.96 7.50
Montana 5 1,198.88 1,191.23 - - - 7.65
Nebraska 6 481.66 481.66 - - - -
Nevada 5 601.189 601.189 - 57.239 - -
North Hampshire 5 224.54 224.54 - 5.68 - -
New Jersey 10 431.36 431.36 27.3 - - -
New Mexico 3 999.9 999.9 - - - -
New York 32 1,750.66 1,731.46 65.81 108.78 229.00 19.20
North Carolina 18 1,323.67 1,273.13 - 239.78 152.97 62.90
North Dakota 3 571.13 571.13 - - - -
Ohio 21 1,726.40 1,572.35 - 35 - 154.05
Oklahoma 7 936.06 930.16 - 120.65 - 5.9
Oregon 6 727.41 727.41 - 6.89 - -
Pennsylvania 22 1,946.08 1,855.31 - 138.84 92.74 90.77
Puerto Rico 3 249.77 249.77 - 249.77 - -
Rhode Island 3 68.53 68.53 - - - -
South Carolina 10 846.58 846.58 - 71.2 - -
South Dakota 4 678.31 678.31 - - - -
Tennessee 18 1,145.54 1,959.54 - 50.57 - 36.80
Texas 25 3,600.49 3,501.15 - 69.53 220.90 99.34
Utah 5 977.29 938 - - - 39.29
Vermont 4 320.22 320.22 - - - -
Virginia 16 1,156.43 1,117.23 - 45.28 - 39.2
Washington 7 763.67 763.67 - - - -
West Virginia 7 612.93 549.05 - 32.06 - 63.88
Wisconsin 7 833.56 741.8 - 167 - 91.76
Wyoming 4 913.6 913.6 - - - -
Totals: 532 49455.15 49072.51 402.83 3761.917 1387.07 1245.8  
Updated: 1/31/2018
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