List of Interstate Highways
Primary Interstate Highways are the major interstate highways of the United States and have a one or two-digit route number. Even (0, 2, 4, 6, or 8) route numbers are given to east/west routes, with the smaller numbered routes in the south (I-10) and bigger numbered routes in the north (I-90). Similarly, odd (1, 3, 5, 7, or 9) route numbers are given to north/south routes, with the smaller numbered routes in the west (I-5) and the bigger numbered routes in the east (I-95). Routes that end in a 0 or a 5 are major routes in the system. These Interstates generally go from coast to coast or from the bottom to the top of the U.S. For example, Interstate 5 goes from the Mexican Border at San Diego, California to the Canadian Border at Blaine, Washington. Likewise, Interstate 10, the southernmost cross-country Interstate Highway, goes from Santa Monica, California on the west coast to Jacksonville, Florida on the east coast. The longest Interstate Highway in the United States is Interstate 90.


There are five sets of numbers that are used more than once throughout the system; the highways whose numbers are used more than once are separated by big distances to avoid confusion. Below, these are made separate from each other by West and East.
Three-digit Interstates are spur or loop Interstates that usually are in big cities and areas outside of cities. The last two digits of a three-digit Interstate are always the number of the route it is related to. If the first digit is odd (1, 3, 5, 7, or 9), the Interstate is usually a spur route while if the first digit is even (2, 4, 6, 8, or 0), the Interstate is usually a loop route.
Primary Interstates
A total of 69 primary Interstates are in the table below, with 43 of them having three-digit routes. The lengths in the table are as of December 31, 2013.
Routes ending in 0 or 5 are marked in green, denoting an interstate major.
Interstate |
Route, States Served & Associated routes (* not signposted as interstates) (sort by number of states served) |
Length[1] (mi.) |
---|---|---|
![]() |
Palmview, Texas (US-83) to Harlingen, Texas (I-69E / US-77) Texas Intrastate Interstate Associated routes: none |
46.80 |
![]() |
Tampa, Florida (I-275) to Daytona Beach, Florida (I-95) Florida Intrastate Interstate Associated routes: none |
132.30 |
![]() |
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 |
![]() |
San Diego, California (Sunset Cliffs Blvd.) to Casa Grande, Arizona (I-10) 2 States Served: CA, AZ Associated routes: none |
348.25 |
![]() |
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 |
![]() |
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 |
![]() |
Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59) Louisiana Intrastate Interstate Associated routes: none |
85.59 |
![]() |
Copperas Cove, Texas (US-190 / TX-9) to Belton, Texas (I-35 / US-190) Texas Intrastate Interstate Associated routes: I-214 (planned) |
24.80 |
![]() |
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 |
![]() |
Macon, Georgia (I-75) to Savannah, Georgia (Montgomery St.) Georgia Intrastate Interstate Associated route: I-516 |
166.81 |
![]() |
Phoenix, Arizona (I-10) to Flagstaff, Arizona (AZ-89A) Arizona Intrastate Interstate Associated routes: none |
145.76 |
![]() |
Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10) Arizona Intrastate Interstate Associated routes: none |
63.35 |
![]() |
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 |
![]() |
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 |
![]() |
Pulley's Mill, Illinois (I-57) to Chattanooga, Tennessee (I-75) 4 States Served: Illinois, Kentucky, Tennessee, Georgia Associated route: I-124 |
316.36 |
![]() |
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 |
![]() |
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] |
![]() |
Lubbock, Texas (US-87 and Loop 289) to Amarillo, Texas (I-40) Texas Intrastate Interstate Associated routes: none |
124.13 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
Corpus Christi, Texas (US-181) to San Antonio, Texas (I-35) Texas Intrastate Interstate Associated routes: none |
143.00 |
![]() |
Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29 & US-51) 2 States Served: Illinois, Wisconsin Associated routes: none |
306.14 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
Galveston, Texas (TX-87) to Dallas, Texas (I-30) Texas Intrastate Interstate Associated route: I-345* |
284.91 |
![]() |
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 |
![]() |
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 |
![]() |
Miner, Missouri (I-55) to Chicago, Illinois (I-94) 2 States Served: Missouri, Illinois Associated routes: none |
386.12 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
Middletown, Virginia (I-81) to Washington, D.C. (US-29) 2 States Served: Virginia, District of Columbia Associated routes: none |
76.28 |
![]() |
Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70) 2 States Served: West Virginia, Maryland Associated routes: none |
113.15 |
![]() |
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 |
![]() |
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 |
![]() |
Louisville, Kentucky (I-64) to Cleveland, Ohio (I-90) 2 States Served: Kentucky, Ohio Associated routes: I-271, I-471 |
345.57 |
![]() |
Hannibal, Missouri (US-61) to Champaign, Illinois (I-57) 2 States Served: Missouri, Illinois Associated route: I-172 |
179.29 |
![]() |
Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85) North Carolina Intrastate Interstate Associated routes: none |
12.27 |
![]() |
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 |
![]() |
East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52) 2 States Served: VA, NC. Planned: WV Associated routes: none |
12.10 |
![]() |
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 |
![]() |
West Denver, Colorado (I-70) to Big Springs, Nebraska (I-80) 2 States Served: Colorado, Nebraska Associated routes: none |
187.34 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
Charleston, West Virginia (I-77) to Erie, Pennsylvania (PA-5) 2 States Served: West Virginia, Pennsylvania Associated routes: I-279, I-579 |
343.24 |
![]() |
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 |
![]() |
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 |
![]() |
Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84) 2 States Served: Washington, Oregon Associated route: I-182 |
143.58 |
![]() |
Baltimore, Maryland to Harrisburg, Pennsylvania (I-81) 2 States Served: Maryland, Pennsylvania Associated route: I-283 |
85.3 |
![]() |
West Portland, Oregon (I-5) to Echo, Utah (I-80) 3 States Served: Oregon, Idaho, Utah Associated route: I-184 |
769.62 |
![]() |
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 |
![]() |
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 |
![]() |
West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15) Idaho Intrastate Interstate Associated routes: none |
62.85 |
![]() |
East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17) 2 States Served: Pennsylvania, New York Associated routes: none |
183.56 |
![]() |
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 |
![]() |
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 |
![]() |
West Barstow, Illinois (I-80) to Chicago, Illinois (I-290) Illinois Intrastate Interstate Associated routes: none |
140.6 |
![]() |
East Binghamton, New York (I-81) to Schenectady, New York (I-90) New York Intrastate Interstate Associated routes: none |
117.75 |
![]() |
Bow, New Hampshire (I-93) to Highgate Springs, Vermont (Canada) 2 States Served: New Hampshire, Vermont Associated route: I-189 |
191.12 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
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 |
![]() |
Muskegon, Michigan (US-31) to Detroit, Michigan (I-75) Michigan Intrastate Interstate Associated routes: I-196, I-296*, I-496, I-696 |
192.06 |
![]() |
Annapolis, Maryland (US-50) to Baltimore, Maryland (I-695) Maryland Intrastate Interstate Associated routes: none |
17.62 |
![]() |
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 |
Interstates outside of the mainland
Interstate Highways are not only in the 48 states of the United States that border, but there are also Interstates in Hawaii, Alaska, and Puerto Rico.
Hawaiian Interstates
The Interstate Highways in the island of Oʻahu, Hawaii are signed with the normal Interstate shield, with the letter "H-" added before the number. They are fully controlled-access routes built to the same standards as the Interstate routes in the main part of the United States. These are marked and considered interstates.
Interstate | Route | Length (miles)[1] |
---|---|---|
![]() |
Kapolei, Hawaii (HI-93) to Honolulu, Hawaii (HI-72) Associated route: H-201 |
27.16 |
![]() |
Pearl City, Hawaii (H-1) to Wahiawa, Hawaii (HI-99) |
8.33 |
![]() |
Halawa, Hawaii (H-1 & H-201) to Marine Corps Base Hawaii |
15.32 |
Alaska and Puerto Rico
The Federal Highway Administration gives money to 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 do not have to meet the same standards as the Interstate routes in the main part of the United States. Note that these are not marked and considered as interstates, but state and territory highways.
“ | 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] | ” |
Alaska

Alaska's Interstates do not have signs to mark them, although they all have state highway numbers that are not the same as the Interstate numbers.[4]
Puerto Rico

Like Alaska, Puerto Rico signs its Interstates as territorial routes, and the numbers are not the same as their official Interstate designations. Many of the territory's routes are freeway-standard toll roads.[5]
Related pages
References
- Adderley, Kevin (January 15, 2014). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2013". Route Log and Finder List. Federal Highway Administration.
- "Google Maps driving directions". Retrieved 2010-04-04.
- Federal Highway Administration. "FHWA Route Log and Finder List". Retrieved 2007-05-24.
- Voss, Oscar. "Alaska Roads - Interstate ends photos". Retrieved 2007-05-24.
- Voss, Oscar. "Puerto Rico road photos". Retrieved 2007-05-24.
Other websites
- Alaska Roads - Interstate ends photos
- Puerto Rico road photos
- The Dwight D. Eisenhower National System of Interstate and Defense Highways Route Log and Finder List
- 3-digit Interstate Highways