Dwight D. Eisenhower National System of Interstate and Defense Highways | |
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Highway shield for Interstate 90 and the Eisenhower Interstate System
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Primary Interstate Highways in the 48 contiguous states as of 2022
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System information | |
Formed | June 29, 1956[1] |
Highway names | |
Interstates | Interstate X (I-X) |
System links | |
There are 70 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south–north, with lower numbers in the west and higher numbers in the east; even-numbered Interstates run west–east, with lower numbers in the south and higher numbers in the north. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, CaliforniatoJacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.
Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico.
There are 70 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highways. This number does not include auxiliary Interstate Highways.
Number | Length (mi)[2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
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46.80 | 75.32 | BL US 83inPeñitas, Texas | I-69E/US 77/US 83inHarlingen, Texas | 02013-01-012013 | current | Unfinished in Texas Texas only | |
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132.30 | 212.92 | I-275inTampa, Florida | I-95/SR 400inDaytona Beach, Florida | 01959-01-011959 | current | Florida only | |
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1381.29 | 2,222.97 | Fed. 1/Fed. 1DatMexican borderinSan Ysidro, California | Hwy 99atCanadian borderinBlaine, Washington | 01956-01-011956 | current | Serves three states: California, Oregon, Washington Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California | |
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348.25 | 560.45 | Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, California | I-10inCasa Grande, Arizona | 01964-01-011964 | current | Serves two states: California, Arizona | |
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2460.34 | 3,959.53 | SR 1inSanta Monica, California | I-95/US 17/SR 15/SR 228inJacksonville, Florida | 01957-01-011957 | current | Serves eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910 | |
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53.90 | 86.74 | US 93atArizona state line near Boulder City, Nevada | US 95/SR 157inLas Vegas, Nevada | 02017-01-012017 | current | Unfinished in Nevada Nevada only; planned in one more: Arizona | |
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85.59 | 137.74 | I-10inBaton Rouge, Louisiana | I-10/I-59inSlidell, Louisiana | 01967-01-011967 | current | Louisiana only | |
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25.10 | 40.39 | US 190/US 190 BusinCopperas Cove, Texas | I-35/US 190 in Belton, Texas | 02017-01-262017 | current | Unfinished in Texas Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia Planned associated routes: I-14N, I-14S, and I-214 in Texas | |
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1433.52 | 2,307.03 | I-8/SR 15inSan Diego, California | Highway 4atCanadian borderinSweetgrass, Montana | 01957-01-011957 | current | Unfinished in California Serves six states: California, Nevada, Arizona, Utah, Idaho, Montana Associated routes: I-115, I-215, I-315 | |
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166.81 | 268.45 | I-75/SR 540inMacon, Georgia | Montgomery Street in Savannah, Georgia | 01966-01-011966 | current | Georgia only Associated route: I-516 | |
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145.76 | 234.58 | I-10/US 60inPhoenix, Arizona | I-40/SR 89AinFlagstaff, Arizona | 01961-01-011961 | current | Arizona only | |
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63.35 | 101.95 | I-19 Bus.inNogales, Arizona | I-10inTucson, Arizona | 01972-01-011972 | current | Arizona only Uses kilometers instead of miles | |
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1539.38 | 2,477.39 | I-10inReeves County, Texas | I-95/I-20 Bus.inFlorence, South Carolina | 01957-01-011957 | current | Serves six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina Associated routes: I-220, I-520, I-820 | |
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202.22 | 325.44 | I-269/US 78/MS 304 near Byhalia, Mississippi | I-65inBirmingham, Alabama | 02012-01-012012 | current | Unfinished in Alabama Serves two states: Mississippi, Alabama Planned associated routes: I-222 and I-422 in Alabama | |
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316.36 | 509.13 | I-57inPulley's Mill, Illinois | I-75inChattanooga, Tennessee | 01962-01-011962 | current | Serves four states: Illinois, Kentucky, Tennessee, Georgia Associated route: I-124 | |
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1061.67 | 1,708.59 | I-10/US 85/US 180inLas Cruces, New Mexico | I-90/US 87inBuffalo, Wyoming | 01957-01-011957 | current | Serves three states: New Mexico, Colorado, Wyoming Associated route: I-225 | |
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304.64 | 490.27 | US 11W/US 23/SR 137inKingsport, Tennessee | US 17inCharleston, South Carolina | 01960-01-011960 | current | Unfinished in North Carolina Serves three states: Tennessee, North Carolina, South Carolina Associated routes: I-126, I-526 | |
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124.13 | 199.77 | US 87/Loop 289inLubbock, Texas | I-40/US 87/US 287/US 60inAmarillo, Texas | 01969-01-011969 | current | Unfinished in Texas Texas only; planned in one more: New Mexico | |
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755.51 | 1,215.88 | I-35/I-70/US 24/US 40/US 71inKansas City, Missouri | US 81 and PTH 75atCanadian borderinPembina, North Dakota | 01958-01-011958 | current | Serves four states: Missouri, Iowa, South Dakota, North Dakota Associated routes: I-129, I-229 | |
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366.76 | 590.24 | I-20inFort Worth, Texas | I-40/US 65/US 67/US 167inNorth Little Rock, Arkansas | 01957-01-011957 | current | Serves two states: Texas, Arkansas Associated routes: I-430, I-530, I-630 | |
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1568.38 | 2,524.06 | US 83/Victoria Street in Laredo, Texas | MN 61/LSCT/26th Avenue in Duluth, Minnesota | 01956-01-011956 | current | Serves six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635 | |
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143.00 | 230.14 | US 181inCorpus Christi, Texas | I-35/US 281inSan Antonio, Texas | 01959-01-011959 | current | Texas only | |
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306.14 | 492.68 | I-55inNormal, Illinois | WIS 29/US 51inWausau, Wisconsin | 01984-01-011984 | current | Serves two states: Illinois, Wisconsin | |
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2556.61 | 4,114.46 | I-15inBarstow, California | US 117/NC 132inWilmington, North Carolina | 01964-01-011964 | current | Serves eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina Associated routes: I-140, I-240, I-440, I-540, I-640, I-840 | |
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175.00 | 281.64 | I-94/US 41inRussell, Illinois | I-43/US 41/US 141inHoward, Wisconsin | 02015-01-012015 | current | Serves two states: Illinois, Wisconsin | |
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142.00 | 228.53 | I-40/US 70inGarner, North Carolina | US 70 in Morehead City, North Carolina | proposed | — | Future Interstate, will only serve North Carolina | |
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191.55 | 308.27 | I-39/I-90inBeloit, Wisconsin | I-41/US 41/US 141inHoward, Wisconsin | 01981-01-011981 | current | Wisconsin only | |
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636.69 | 1,024.65 | US 82/US 277/US 281/US 287inWichita Falls, Texas | I-70inSt. Louis, Missouri | 01958-01-011958 | current | Serves three states: Texas, Oklahoma, Missouri Associated routes: I-244, I-344, I-444 | |
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284.91 | 458.52 | SH 87inGalveston, Texas | I-30/US 67/US 75inDallas, Texas | 01971-01-011971 | current | Texas only Associated route: I-345 | |
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528.02 | 849.77 | I-10/US 167/LA 182inLafayette, Louisiana | I-435/I-470/US 50/US 71inKansas City, Missouri | 01984-01-011984 | current | Unfinished in Arkansas and Louisiana Serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas | |
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964.25 | 1,551.81 | I-10inLaPlace, Louisiana | US 41inChicago, Illinois | 01960-01-011960 | current | Serves six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois Associated routes: I-155, I-255, I-355, I-555 | |
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386.12 | 621.40 | I-55inMiner, Missouri | I-94inChicago, Illinois | 01965-01-011965 | current | Unfinished in Missouri Serves two states: Missouri, Illinois; planned in one more: Arkansas | |
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445.23 | 716.53 | I-10/I-12inSlidell, Louisiana | I-24inWildwood, Georgia | 01960-01-011960 | current | Serves four states: Louisiana, Mississippi, Alabama, Georgia Associated routes: I-359, I-459, I-759 | |
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963.52 | 1,550.64 | I-70/US 61inWentzville, Missouri | I-264/I-664inChesapeake, Virginia | 01961-01-011961 | current | Serves six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia Associated routes: I-264, I-464, I-564, I-664 | |
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887.30 | 1,427.97 | I-10inMobile, Alabama | US 12/US 20inGary, Indiana | 01958-01-011958 | current | Serves four states: Alabama, Tennessee, Kentucky, Indiana Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky | |
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76.28 | 122.76 | I-81inFront Royal, Virginia | US 29inWashington, D.C. | 01961-01-011961 | current | Serves DC and one state: Virginia | |
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113.15 | 182.10 | I-79inMorgantown, West Virginia | I-70inHancock, Maryland | 01991-01-011991 | current | Serves two states: West Virginia, Maryland | |
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879.82 | 1,415.93 | US 59inRosenberg, Texas | Hwy 402atCanadian borderinPort Huron, Michigan | 01957-01-011957 | current | Unfinished in Texas, Mississippi, Kentucky, and Indiana Serves six states: Texas, Mississippi, Kentucky, Indiana, Michigan. Planned/started in 3 more: Louisiana, Arkansas, Tennessee Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-569 in Kentucky | |
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2172.16 | 3,495.75 | I-15inCove Fort, Utah | I-695inWoodlawn, Maryland | 01956-01-011956 | current | Serves 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland Associated routes: I-170, I-270, I-370, I-470, I-670 | |
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345.57 | 556.14 | I-64inLouisville, Kentucky | I-90inCleveland, Ohio | 01959-01-011959 | current | Serves two states: Kentucky, Ohio Associated routes: I-271, I-471 | |
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179.29 | 288.54 | US 61inHannibal, Missouri | Church Street and University Avenue in Champaign, Illinois | 01970-01-011970 | current | Serves two states: Missouri, Illinois Associated route: I-172 | |
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99.43 | 160.02 | US 220 near Stokesdale, North Carolina | I‑74 and US 220 in Randleman, North Carolina | 01997-01-011997 | current | Unfinished in North Carolina North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan | |
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491.74 | 791.38 | I-80inBettendorf, Iowa | US 74/NC 41 near Lumberton, North Carolina | 01974-01-011974 | current | Unfinished in Ohio and North Carolina Serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina Associated routes: I-474; Planned: I-274 in North Carolina | |
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1786.47 | 2,875.04 | SR 826/SR 916/SR 924inMiami Lakes, Florida | Canadian borderatSault Ste. Marie, Michigan | 01958-01-011958 | current | Serves six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan Associated routes: I-175, I-275, I-375, I-475, I-575, I-675 | |
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186.48 | 300.11 | I-70atDenver, Colorado | I-80atBig Springs, Nebraska | 01975-01-011975 | current | Serves two states: Colorado, Nebraska | |
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435.66 | 701.13 | I-71inWestfield Center, Ohio | I-295atBellmawr, New Jersey | 01964-01-011964 | current | Serves three states: Ohio, Pennsylvania, New Jersey Associated routes: I-176, I-276, I-376, I-476, I-676 | |
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610.10 | 981.86 | I-26inColumbia, South Carolina | I-90inCleveland, Ohio | 01958-01-011958 | current | Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio Associated route: I-277 | |
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146.28 | 235.41 | I-81atJonestown, Pennsylvania | Canal StreetinNew York City | 01957-01-011957 | current | Serves three states: Pennsylvania, New Jersey, New York Associated routes: I-278, I-478, I-678, I-878 | |
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343.46 | 552.75 | I-77inCharleston, West Virginia | PA 5inErie, Pennsylvania | 01967-01-011967 | current | Serves two states: West Virginia, Pennsylvania Associated routes: I-279, I-579 | |
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2899.59 | 4,666.44 | US 101inSan Francisco, California | I-95inTeaneck, New Jersey | 01956-01-011956 | current | Serves 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980 | |
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855.02 | 1,376.02 | I-40inDandridge, Tennessee | Hwy 137atCanadian borderonWellesley Island, New York | 01961-01-011961 | current | Serves six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York Associated routes: I-381, I-481, I-581, I-781 | |
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143.58 | 231.07 | I-90inEllensburg, Washington | I-84inHermiston, Oregon | 01957-01-011957 | current | Serves two states: Washington, Oregon Associated route: I-182 | |
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— | — | I-81/I-84/US 6inScranton, Pennsylvania | I-95inTeaneck, New Jersey | 01957-01-011957 | 01958-01-011958 | Served two states: Pennsylvania, New Jersey Was the initial designation to what is now I-380 and I-80 | |
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— | — | I-84inEast Hartford, Connecticut | Providence, Rhode Island | 01956-01-011956 | 01968-01-011968 | Served one state: Connecticut, was planned for one state: Rhode Island Redesignated as I-84 in 1968 | |
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85.03 | 136.84 | President Street and Fayette Street in Baltimore, Maryland | I-81inHarrisburg, Pennsylvania | 01959-01-011959 | current | Serves two states: Maryland, Pennsylvania Associated route: I-283 | |
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769.62 | 1,238.58 | I-5inPortland, Oregon | I-80inEcho, Utah | 01980-01-011980 | current | Serves three states: Oregon, Idaho, Utah Associated route: I-184 | |
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232.71 | 374.51 | I-81inScranton, Pennsylvania | I-90inSturbridge, Massachusetts | 01963-01-011963 | current | Serves four states: Pennsylvania, New York, Connecticut, Massachusetts Associated routes: I-384, I-684 | |
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666.05 | 1,071.90 | I-65inMontgomery, Alabama | I-95inPetersburg, Virginia | 01958-01-011958 | current | Unfinished in Alabama Serves five states: Alabama, Georgia, South Carolina, North Carolina, Virginia Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina | |
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62.85 | 101.15 | I-84 near Declo, Idaho | I-15inChubbuck, Idaho | 01980-01-011980 | current | Idaho only | |
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223.39 | 359.51 | I-90 near North East, Pennsylvania | NY 17/NY 79inWindsor, New York | 01999-01-011999 | current | Unfinished in New York Serves two states: Pennsylvania, New York | |
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38.97 | 62.72 | I-84inEast Hartford, Connecticut | I-90inSturbridge, Massachusetts | 01968-01-011968 | 01984-01-011984 | Served two states: Connecticut, Massachusetts Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled | |
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12.90 | 20.76 | I-440/US 64/US 264inRaleigh, North Carolina | US 64/US 264 in Wendell, North Carolina | 02017-01-012017 | current | Unfinished in North Carolina North Carolina only; planned in one more: Virginia Associated route: I-587 Shortest Interstate highway in contiguous United States | |
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333.49 | 536.70 | I-278inNew York City | A-15atCanadian borderinChamplain, New York | 01957-01-011957 | current | New York only Associated routes: I-287, I-587, I-787 | |
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140.60 | 226.27 | I-80/IL 92inEast Moline, Illinois | I-290/IL 110inHillside, Illinois | 01987-01-011987 | current | Illinois only | |
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117.75 | 189.50 | I-81inBinghamton, New York | I-90inSchenectady, New York | 01968-01-011968 | current | New York only | |
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191.12 | 307.58 | I-93/SR 3AinBow, New Hampshire | Route 133/Future A-35atCanadian borderinHighgate, Vermont | 01960-01-011960 | current | Serves two states: New Hampshire, Vermont Associated route: I-189 | |
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3020.44 | 4,860.93 | SR 519/4th Avenue/Edgar Martinez Drive in Seattle, Washington | MA 1AinBoston, Massachusetts | 01956-01-011956 | current | Serves 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990 Longest Interstate highway | |
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290.37 | 467.31 | I-95/Route 34inNew Haven, Connecticut | A-55atCanadian borderinDerby Line, Vermont | 01958-01-011958 | current | Serves three states: Connecticut, Massachusetts, Vermont Associated routes: I-291, I-391, I-691 | |
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189.95 | 305.69 | I-95/US 1inCanton, Massachusetts | I-91inSt. Johnsbury, Vermont | 01957-01-011957 | current | Serves three states: Massachusetts, New Hampshire, Vermont Associated routes: I-293, I-393 | |
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1585.20 | 2,551.13 | I-90inLockwood, Montana | Highway 402atCanadian borderinPort Huron, Michigan | 01956-01-011956 | current | Serves seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894 | |
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1919.31 | 3,088.83 | US 1inMiami, Florida | NB 95atCanadian borderinHoulton, Maine | 01957-01-011957 | current | Serves DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895 Longest primary north-south Interstate highway | |
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192.06 | 309.09 | US 31inNorton Shores, Michigan | I-75inDetroit, Michigan | 01959-01-011959 | current | Michigan only Associated routes: I-196, I-296, I-496, I-696 | |
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17.62 | 28.36 | US 50/US 301inAnnapolis, Maryland | I-695/I-895inGlen Burnie, Maryland | 01987-01-011987 | current | Maryland only | |
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98.34 | 158.26 | I-70/I-76inBedford, Pennsylvania | I-86/NY 17inPainted Post, New York | 01998-01-011998 | current | Unfinished in Pennsylvania Serves two states: Pennsylvania, New York | |
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In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the mainland routes:
Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway.[3]
The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.
Number | Length (mi)[2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
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27.16 | 43.71 | Route 93inKapolei | Route 72inHonolulu | 01960-01-011960 | current | Associated route: H-201 | |
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8.33 | 13.41 | H-1inPearl City | Route 99inWahiawa | 01960-01-011960 | current | ||
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15.32 | 24.66 | H-1/H-201inHalawa | Marine Corps Base Hawaii | 01997-01-011997 | current | ||
Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers.[4]
Number | Length (mi)[2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
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408.23 | 656.98 | Anchorage | Canadian borderinAlcan Border | 01976-01-011976 | current | Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway[5][6][7][8] | |
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202.18 | 325.38 | Tok | Fairbanks | 01976-01-011976 | current | Alaska Highway, Richardson Highway[6][7][8] | |
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148.12 | 238.38 | Anchorage | Soldotna | 01976-01-011976 | current | Seward Highway, Sterling Highway[5][7][8] | |
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323.69 | 520.93 | Gateway, near Palmer | Fairbanks | 01976-01-011976 | current | Parks Highway[5][6][7][8] | |
Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.[9]
Number | Length (mi)[2] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
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71.08 | 114.39 | PR-2inPonce | PR-2 in San Juan | 01976-01-011976 | current | Follows PR-52 | |
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138.13 | 222.30 | PR-1inPonce | PR-3inSan Juan | 01976-01-011976 | current | Follows PR-22 | |
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40.56 | 65.27 | PR-3inHumacao | PR-2inSan Juan | 01976-01-011976 | current | Follows PR-66 | |
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Other |
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Routes in italics are no longer a part of the system. Major Interstates are highlighted. |