Interstate | Route, States Served & Associated routes (* not signposted as interstates) (sort by number of states served) | Length[1] (mi.) |
I-2 | Palmview, Texas (US-83) to Harlingen, Texas (I-69E / US-77) Texas Intrastate Interstate Associated routes: none | 46.80 |
I-4 | Tampa, Florida (I-275) to Daytona Beach, Florida (I-95) Florida Intrastate Interstate Associated routes: none | 132.30 |
I-5 | 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-8 | San Diego, California (Sunset Cliffs Blvd.) to Casa Grande, Arizona (I-10) 2 States Served: CA, AZ Associated routes: none | 348.25 |
I-10 | 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-11 | Arizona state line (US-93) to Henderson, Nevada (I-215 / I-515 / US-93 / US-95) 1 State Served: Nevada. 1 Planned: Arizona Associated routes: none | 22.84 |
I-12 | Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59) Louisiana Intrastate Interstate Associated routes: none | 85.59 |
I-14 | Copperas Cove, Texas (US-190 / TX-9) to Belton, Texas (I-35 / US-190) Texas Intrastate Interstate Associated routes: I-214 (planned) | 24.80 |
I-15 | 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 | Macon, Georgia (I-75) to Savannah, Georgia (Montgomery St.) Georgia Intrastate Interstate Associated route: I-516 | 166.81 |
I-17 | Phoenix, Arizona (I-10) to Flagstaff, Arizona (AZ-89A) Arizona Intrastate Interstate Associated routes: none | 145.76 |
I-19 | Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10) Arizona Intrastate Interstate Associated routes: none | 63.35 |
I-20 | 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 | Memphis, Tennessee (I-55 & I-40) to Birmingham, Alabama (I-65/US 31) 2 States Served: Mississippi, Alabama. Planned: Tennessee Associated route: I-422 (planned) | 213.0 |
I-24 | 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 | 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 | Kingsport, Tennessee (US-11W) to Charleston, South Carolina (US-17) 3 States Served: Tennessee, North Carolina, South Carolina Associated routes: I-126, I-526 | 346[2] |
I-27 | Lubbock, Texas (US-87 and Loop 289) to Amarillo, Texas (I-40) Texas Intrastate Interstate Associated routes: none | 124.13 |
I-29 | 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 | 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 | 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 | Corpus Christi, Texas (US-181) to San Antonio, Texas (I-35) Texas Intrastate Interstate Associated routes: none | 143.00 |
I-39 | Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29 & US-51) 2 States Served: Illinois, Wisconsin Associated routes: none | 306.14 |
I-40 | Barstow, California (I-15) to Wilmington, North Carolina (NC-132) 8 States Served: CA, AZ, NM, TX, OK, AR, TN, NC Associated routes: I-140, I-240, I-440, I-540, I-840 | 2,554.10 |
I-41 | Russell, Illinois (I-94 and US-41) to Howard, Wisconsin (I-43, US-41 and US-141) 2 States Served: Illinois, Wisconsin Associated routes: none | 176.33 |
I-43 | Beloit, Wisconsin (I-39 and I-90) to Howard, Wisconsin (I-41, US-41 and US-141) Wisconsin Intrastate Interstate Associated routes: none | 191.55 |
I-44 | 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 | Galveston, Texas (TX-87) to Dallas, Texas (I-30) Texas Intrastate Interstate Associated route: I-345* | 284.91 |
I-49 | Lafayette, Louisiana (I-10) to Kansas City, Missouri (I-435 / US-50, I-470, and US-71) 3 States Served: Louisiana, Arkansas, Missouri. 1 Planned: Texas Associated routes: none | 528.02 |
I-55 | 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 | Miner, Missouri (I-55) to Chicago, Illinois (I-94) 2 States Served: Missouri, Illinois Associated routes: none | 386.12 |
I-59 | 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 | 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 (KY), I-264 (VA), I-464, I-564, I-664 | 953.74 |
I-65 | 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 | Middletown, Virginia (I-81) to Washington, D.C. (US-29) 2 States Served: Virginia, District of Columbia Associated routes: none | 76.28 |
I-68 | Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70) 2 States Served: West Virginia, Maryland Associated routes: none | 113.15 |
I-69 | Victoria, Texas (I-69E / US 77 future & I-69W / US 59 future) to Port Huron, Michigan (Canada and Hwy 402) 6 States Served: TX, MS, TN, KY, IN, MI. 2 Planned: LA, AR Associated route: I-469 I-269 future, I-369 planned | 705.40 |
I-70 | 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 | Louisville, Kentucky (I-64) to Cleveland, Ohio (I-90) 2 States Served: Kentucky, Ohio Associated routes: I-271, I-471 | 345.57 |
I-72 | Hannibal, Missouri (US-61) to Champaign, Illinois (I-57) 2 States Served: Missouri, Illinois Associated route: I-172 | 179.29 |
I-73 | Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85) North Carolina Intrastate Interstate Associated routes: none | 12.27 |
I-74 | West Bettendorf, Iowa (I-80) to Cincinnati, Ohio (I-75) 7 States Served: IA, IL, IN, OH, WV, VA, NC Associated route: I-474 | 416.71 |
I-74 | East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52) 2 States Served: VA, NC. Planned: WV Associated routes: none | 12.10 |
I-75 | 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 | West Denver, Colorado (I-70) to Big Springs, Nebraska (I-80) 2 States Served: Colorado, Nebraska Associated routes: none | 187.34 |
I-76 | East Westfield Center, Ohio (I-71) to Camden, New Jersey (I-295) 3 States Served: Ohio, Pennsylvania, New Jersey Associated routes: I-176, I-276, I-376, I-476, I-676 | 434.36 |
I-77 | 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 | 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 | 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 | 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 | Dandridge, Tennessee (I-40) to Fisher's Landing, New York (Canada) 6 States Served: TN, VA, WV, MD, PA, NY Associated routes: I-181, I-381, I-481, I-581 | 854.89 |
I-82 | Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84) 2 States Served: Washington, Oregon Associated route: I-182 | 143.58 |
I-83 | Baltimore, Maryland to Harrisburg, Pennsylvania (I-81) 2 States Served: Maryland, Pennsylvania Associated route: I-283 | 85.3 |
I-84 | West Portland, Oregon (I-5) to Echo, Utah (I-80) 3 States Served: Oregon, Idaho, Utah Associated route: I-184 | 769.62 |
I-84 | 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 | 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 | 668.75 |
I-86 | West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15) Idaho Intrastate Interstate Associated routes: none | 62.85 |
I-86 | East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17) 2 States Served: Pennsylvania, New York Associated routes: none | 183.56 |
I-87 | South Raleigh, North Carolina (I-40 , I-440, and US 64) to Wendell, North Carolina (US 64 and US 264) 1 State Served: North Carolina. 1 Planned: Virginia Associated routes: I-587 | 12.9 |
I-87 | North 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 | West Barstow, Illinois (I-80) to Chicago, Illinois (I-290) Illinois Intrastate Interstate Associated routes: none | 140.6 |
I-88 | East Binghamton, New York (I-81) to Schenectady, New York (I-90) New York Intrastate Interstate Associated routes: none | 117.75 |
I-89 | Bow, New Hampshire (I-93) to Highgate Springs, Vermont (Canada) 2 States Served: New Hampshire, Vermont Associated route: I-189 | 191.12 |
I-90 | 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 | 3,020.54 |
I-91 | 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 | 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 | 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 | 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 | 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 | Annapolis, Maryland (US-50) to Baltimore, Maryland (I-695) Maryland Intrastate Interstate Associated routes: none | 17.62 |
I-99 | Bedford, Pennsylvania (I-76) to Painted Post, New York (I-86) Unfinished Pennsylvania section: Bellefonte, Pennsylvania (I-80) to New York border near Lawrenceville, Pennsylvania (US 15) 2 states served: Pennsylvania, New York Associated routes: none | 98.86 |