Primary Interstate Highways
There are 66 primary Interstate Highways listed in the table below, with 43 of them having auxiliary routes. Listed lengths are as of October 31, 2002.
Routes ending in 0 or 5 are highlighted in green.
| Interstate |
Route, States Served & Associated routes (* not signposted as interstates) (sort by number of states served) |
Length (mi.) |
|---|---|---|
| I-04 !I-4 | 01 !Tampa, Florida (I-275) to Daytona Beach, Florida (I-95) Florida Intrastate Interstate Associated routes: none |
132.30 |
| I-05 !I-5 | 03 ! San Ysidro, California (Mexico and MX-1) to Blaine, Washington (Canada and BC 99) 3 States Served: CA, OR, WA Associated routes: I-105, I-205, I-305*, I-405, I-505, I-605, I-705, I-805 |
1,381.29 |
| I-08 !I-8 | 02 !San Diego, California (Sunset Cliffs Blvd.) to Casa Grande, Arizona (I-10) 2 States Served: CA, AZ Associated routes: none |
348.25 |
| I-10 | 08 ! Santa Monica, California (CA-1) to Jacksonville, Florida (I-95) 8 States Served: CA, AZ, NM, TX, LA, MS, AL, FL Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910* |
2,460.34 |
| I-12 | 01 !Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59) Louisiana Intrastate Interstate Associated routes: none |
85.59 |
| I-15 | 06 ! San Diego, California (I-8/CA-15) to Sweetgrass, Montana (Canada and Hwy 4) 6 States Served: CA, NV, AZ, UT, ID, MT Associated routes: I-115, I-215, I-315*, I-515 |
1,433.52 |
| I-16 | 01 !Macon, Georgia (I-75) to Savannah, Georgia (Montgomery St.) Georgia Intrastate Interstate Associated route: I-516 |
166.81 |
| I-17 | 01 !Phoenix, Arizona (I-10) to Flagstaff, Arizona (AZ-89A) Arizona Intrastate Interstate Associated routes: none |
145.76 |
| I-19 | 01 !Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10) Arizona Intrastate Interstate Associated routes: none |
63.60 |
| I-20 | 06 ! Kent, Texas (I-10) to Florence, South Carolina (I-95) 6 States Served: TX, LA, MS, AL, GA, SC Associated routes: I-220, I-520, I-820 |
1,539.38 |
| I-22 | 02 !Memphis, Tennessee (I-55 & I-40) to Birmingham, Alabama (I-65/US 31) 2 States Served: Mississippi, Alabama. Planned in 1 more: Tennessee Planned associated route: I-422 |
213.0 |
| I-24 | 04 !Pulley's Mill, Illinois (I-57) to Chattanooga, Tennessee (I-75) 4 States Served: Illinois, Kentucky, Tennessee, Georgia Associated route: I-124 |
316.36 |
| I-25 | 03 ! Las Cruces, New Mexico (I-10) to Buffalo, Wyoming (I-90) 3 States Served: New Mexico, Colorado, Wyoming Associated route: I-225 |
1,062.77 |
| I-26 | 03 !Kingsport, Tennessee (US-11W) to Charleston, South Carolina (US-17) 3 States Served: Tennessee, North Carolina, South Carolina Associated routes: I-126, I-526 |
349 |
| I-27 | 01 !Lubbock, Texas (US-87 and Loop 289) to Amarillo, Texas (I-40) Texas Intrastate Interstate Associated routes: none |
124.13 |
| I-29 | 04 !Kansas City, Missouri (I-35 & I-70) to Pembina, North Dakota (Canada and US 81 and PTH 29) 4 States Served: Missouri, Iowa, South Dakota, North Dakota Associated routes: I-129, I-229 |
755.51 |
| I-30 | 02 ! Fort Worth, Texas (I-20) to North Little Rock, Arkansas (I-40) 2 States Served: Texas, Arkansas Associated routes: I-430, I-530, I-630 |
366.76 |
| I-35 | 06 ! Laredo, Texas (Mexico) to Duluth, Minnesota (MN-61) 6 States Served: TX, OK, KS, MO, IA, MN Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635 |
1,568.38 |
| I-37 | 01 !Corpus Christi, Texas (US-181) to San Antonio, Texas (I-35) Texas Intrastate Interstate Associated routes: none |
143.00 |
| I-39 | 02 !Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29 & US-51) 2 States Served: Illinois, Wisconsin Associated routes: none |
306.14 |
| I-40 | 08 ! Barstow, California (I-15) to Wilmington, North Carolina (U.S. 117/NC-132) 8 States Served: CA, AZ, NM, TX, OK, AR, TN, NC Associated routes: I-140, I-240, I-440, I-540, I-640, I-840 |
2,554.10 |
| I-43 | 01 !Beloit, Wisconsin (I-39 and I-90) to Howard, Wisconsin (US-41 and US-141) Wisconsin Intrastate Interstate Associated routes: none |
191.55 |
| I-44 | 03 !Wichita Falls, Texas (US-277, US-281, and US-287) to St. Louis, Missouri (I-55) 3 States Served: Texas, Oklahoma, Missouri Associated routes: I-244, I-444* |
633.79 |
| I-45 | 01 ! Galveston, Texas (TX-87) to Dallas, Texas (I-30) Texas Intrastate Interstate Associated route: I-345* |
284.91 |
| I-49 | 01 !Lafayette, Louisiana (I-10) to Shreveport, Louisiana (I-20) Louisiana Intrastate Interstate Associated routes: none |
208.25 |
| I-55 | 06 ! Laplace, Louisiana (I-10) to Chicago, Illinois (US-41, Lake Shore Drive) 6 States Served: LA, MS, TN, AR, MO, IL Associated routes: I-155, I-255, I-355 |
964.25 |
| I-57 | 02 !Miner, Missouri (I-55) to Chicago, Illinois (I-94) 2 States Served: Missouri, Illinois Associated routes: none |
386.12 |
| I-59 | 04 !Slidell, Louisiana (I-10 & I-12) to Lookout Mountain, Georgia (I-24) 4 States Served: Louisiana, Mississippi, Alabama, Georgia Associated routes: I-359, I-459, I-759 |
445.23 |
| I-64 | 06 !Wentzville, Missouri (I-70) to Chesapeake, Virginia (I-264 & I-664) 6 States Served: MO, IL, IN, KY, WV, VA Associated routes: I-164, I-264, I-464, I-564, I-664 |
953.74 |
| I-65 | 04 ! Mobile, Alabama (I-10) to Gary, Indiana (I-90) 4 States Served: Alabama, Tennessee, Kentucky, Indiana Associated routes: I-165, I-265, I-465, I-565, I-865 |
887.30 |
| I-66 | 02 !Middletown, Virginia (I-81) to Washington, D.C. (US-29) 2 States Served: Virginia, District of Columbia Associated routes: none |
76.28 |
| I-68 | 02 !Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70) 2 States Served: West Virginia, Maryland Associated routes: none |
112.9 |
| I-69 | 04 !Indianapolis, Indiana (I-465) to Port Huron, Michigan (Canada and Hwy 402) 5 States Served: MS, TN, KY, IN, MI. Planned in 3 more: TX, LA, AR Associated route: I-469; Future: I-269; Planned: I-369 |
458.12 |
| I-70 | 10 ! Cove Fort, Utah (I-15) to Baltimore, Maryland (I-695) 10 States Served: UT, CO, KS, MO, IL, IN, OH, WV, PA, MD Associated routes: I-170, I-270, I-370, I-470, I-670 |
2,153.13 |
| I-71 | 02 !Louisville, Kentucky (I-64) to Cleveland, Ohio (I-90) 2 States Served: Kentucky, Ohio Associated routes: I-271, I-471 |
343.78 |
| I-72 | 02 !Hannibal, Missouri (US-61) to Champaign, Illinois (I-57) 2 States Served: Missouri, Illinois Associated route: I-172 |
179.29 |
| I-73 | 01 !Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85) North Carolina Intrastate Interstate Associated routes: none |
33.5 |
| I-74 | 07 !West Bettendorf, Iowa (I-80) to Cincinnati, Ohio (I-75) 7 States Served: IA, IL, IN, OH, WV, VA, NC Associated route: I-474 |
428.81 |
| I-74 | 02 !East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52) 2 States Served: VA, NC. Planned in 1 more: WV Associated routes: none |
12.10 |
| I-75 | 06 ! Hialeah, Florida (FL-826) to Sault Ste. Marie, Michigan (Canada) 6 States Served: FL, GA, TN, KY, OH, MI Associated routes: I-175, I-275, I-375, I-475, I-575, I-675 |
1,786.47 |
| I-76 | 02 !West Denver, Colorado (I-70) to Big Springs, Nebraska (I-80) 2 States Served: Colorado, Nebraska Associated routes: none |
187.34 |
| I-76 | 03 !East Westfield Center, Ohio (I-71) to Camden, New Jersey (I-295) 3 States Served: Ohio, Pennsylvania, New Jersey Associated routes: I-176, I-376, I-476, I-676 |
434.36 |
| I-77 | 05 !Columbia, South Carolina (I-26) to Cleveland, Ohio (I-90) 5 States Served: South Carolina, North Carolina, Virginia, West Virginia, Ohio Associated routes: I-277 |
610.10 |
| I-78 | 03 !Union Twp., Pennsylvania (I-81) to New York, New York 3 States Served: Pennsylvania, New Jersey, New York Associated routes: I-278, I-478*, I-678, I-878* |
143.56 |
| I-79 | 02 !Charleston, West Virginia (I-77) to Erie, Pennsylvania (PA-5) 2 States Served: West Virginia, Pennsylvania Associated routes: I-279, I-579 |
343.24 |
| I-80 | 11 ! San Francisco, California (U.S. Route 101) to Fort Lee, New Jersey (I-95) 11 States Served: CA, NV, UT, WY, NE, IA, IL, IN, OH, PA, NJ Associated routes: I-180, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980 |
2,899.54 |
| I-81 | 06 !Dandridge, Tennessee (I-40) to Fisher's Landing, New York (Canada) 6 States Served: TN, VA, WV, MD, PA, NY Associated routes: I-381, I-481, I-581 |
854.89 |
| I-82 | 02 !Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84) 2 States Served: Washington, Oregon Associated route: I-182 |
143.58 |
| I-83 | 02 !Baltimore, Maryland to Harrisburg, Pennsylvania (I-81) 2 States Served: Maryland, Pennsylvania Associated route: I-283 |
85.3 |
| I-84 | 03 !West Portland, Oregon (I-5) to Echo, Utah (I-80) 3 States Served: Oregon, Idaho, Utah Associated route: I-184 |
769.62 |
| I-84 | 04 !East Scranton, Pennsylvania (I-81) to Sturbridge, Massachusetts (I-90) 4 States Served: Pennsylvania, New York, Connecticut, Massachusetts Associated routes: I-384, I-684 |
232.4 |
| I-85 | 05 ! Montgomery, Alabama (I-65) to Petersburg, Virginia (I-95) 5 States Served: Alabama, Georgia, South Carolina, North Carolina, Virginia Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-985; Planned: I-685 |
668.75 |
| I-86 | 01 !West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15) Idaho Intrastate Interstate Associated routes: none |
62.85 |
| I-86 | 02 !East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17) 2 States Served: Pennsylvania, New York Associated routes: none |
183.56 |
| I-87 | 01 !New York, New York (I-278) to Champlain, New York (Canada) New York Intrastate Interstate Associated routes: I-287, I-587, I-787 |
333.49 |
| I-88 | 01 !West Barstow, Illinois (I-80) to Chicago, Illinois (I-290) Illinois Intrastate Interstate Associated routes: none |
140.6 |
| I-88 | 01 !East Binghamton, New York (I-81) to Schenectady, New York (I-90) New York Intrastate Interstate Associated routes: none |
117.75 |
| I-89 | 02 !Bow, New Hampshire (I-93) to Highgate Springs, Vermont (Canada) 2 States Served: New Hampshire, Vermont Associated route: I-189 |
191.12 |
| I-90 | 13 ! Seattle, Washington (WA-519) to Boston, Massachusetts (MA-1A) 13 States Served: WA, ID, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MA Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990 |
3,101.77 |
| I-91 | 03 !New Haven, Connecticut/North Haven, Connecticut (I-95) to Derby Line, Vermont (Canada) 3 States Served: Connecticut, Massachusetts, Vermont Associated routes: I-291, I-391, I-691 |
290.37 |
| I-93 | 03 !Canton, Massachusetts (I-95) to St. Johnsbury, Vermont (I-91) 3 States Served: Massachusetts, New Hampshire, Vermont Associated routes: I-293, I-393 |
189.95 |
| I-94 | 07 !Billings, Montana (I-90) to Port Huron, Michigan (Canada) 7 States Served: MT, ND, MN, WI, IL, IN, MI Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894 |
1,585.20 |
| I-95 | 16 ! Miami, Florida (US-1) to Houlton, Maine (Canada) 15 States Served: FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, NH, ME Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895 |
1,925.74 |
| I-96 | 01 !Muskegon, Michigan (US-31) to Detroit, Michigan (I-75) Michigan Intrastate Interstate Associated routes: I-196, I-296*, I-496, I-696 |
192.06 |
| I-97 | 01 !Annapolis, Maryland (US-50) to Baltimore, Maryland (I-695) Maryland Intrastate Interstate Associated routes: none |
17.62 |
| I-99 | 01 !Bedford, Pennsylvania (I-76) to Bellefonte, Pennsylvania (I-80) Pennsylvania Intrastate Interstate Associated routes: none |
85.0 |
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