List of Interstate Highways

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Interstate Highways in the 48 states that border each other. Purple routes are currently built and open freeways, blue are currently open spur routes, and green is proposed routes, future roads, or those being built.
The sign used to mark an interstate.

Primary Interstate Highways are the major interstate highways of the United States and have a one or two-digit route number. Even (2, 4, 6, 8, or 0) 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).

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[change | change source]

There are 66 primary Interstates that are in the table below, with 43 of them having three-digit routes. The lengths in the table are as of October 31, 2002.

Routes ending in 0 or 5 are marked in green.

Route, States Served & Associated routes
(* not signposted as interstates) (sort by number of states served)
I-4.svg I-4 Tampa, Florida (I-275) to Daytona Beach, Florida (I-95)
Florida Intrastate Interstate
Associated routes: none
I-5.svg 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
I-8.svg I-8 San Diego, California (Sunset Cliffs Blvd.) to Casa Grande, Arizona (I-10)
2 States Served: CA, AZ
Associated routes: none
I-10.svg 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*
I-12.svg I-12 Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59)
Louisiana Intrastate Interstate
Associated routes: none
I-15.svg 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
I-16.svg I-16 Macon, Georgia (I-75) to Savannah, Georgia (Montgomery St.)
Georgia Intrastate Interstate
Associated route: I-516
I-17.svg I-17 Phoenix, Arizona (I-10) to Flagstaff, Arizona (AZ-89A)
Arizona Intrastate Interstate
Associated routes: none
I-19.svg I-19 Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10)
Arizona Intrastate Interstate
Associated routes: none
I-20.svg 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
I-22.svg 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)
I-24.svg I-24 Pulley's Mill, Illinois (I-57) to Chattanooga, Tennessee (I-75)
4 States Served: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
I-25.svg I-25 Las Cruces, New Mexico (I-10) to Buffalo, Wyoming (I-90)
3 States Served: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26.svg 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
I-27.svg I-27 Lubbock, Texas (US-87 and Loop 289) to Amarillo, Texas (I-40)
Texas Intrastate Interstate
Associated routes: none
I-29.svg 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
I-30.svg 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
I-35.svg 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
I-37.svg I-37 Corpus Christi, Texas (US-181) to San Antonio, Texas (I-35)
Texas Intrastate Interstate
Associated routes: none
I-39.svg I-39 Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29 & US-51)
2 States Served: Illinois, Wisconsin
Associated routes: none
I-40.svg 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
I-43.svg I-43 Beloit, Wisconsin (I-39 and I-90) to Howard, Wisconsin (US-41 and US-141)
Wisconsin Intrastate Interstate
Associated routes: none
I-44.svg 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*
I-45.svg I-45 Galveston, Texas (TX-87) to Dallas, Texas (I-30)
Texas Intrastate Interstate
Associated route: I-345*
I-49.svg I-49 Lafayette, Louisiana (I-10) to Shreveport, Louisiana (I-20)
Louisiana Intrastate Interstate
Associated routes: none
I-55.svg 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
I-57.svg I-57 Miner, Missouri (I-55) to Chicago, Illinois (I-94)
2 States Served: Missouri, Illinois
Associated routes: none
I-59.svg 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
I-64.svg 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, I-464, I-564, I-664
I-65.svg 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
I-66.svg I-66 Middletown, Virginia (I-81) to Washington, D.C. (US-29)
2 States Served: Virginia, District of Columbia
Associated routes: none
I-68.svg I-68 Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70)
2 States Served: West Virginia, Maryland
Associated routes: none
I-69.svg I-69 Indianapolis, Indiana (I-465) to Port Huron, Michigan (Canada and Hwy 402)
4 States Served: MS, TN, IN, MI. 5 Planned: TX, LA, AR, MS, KY
Associated route: I-469 I-269 future, I-369 planned
I-70.svg 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
I-71.svg I-71 Louisville, Kentucky (I-64) to Cleveland, Ohio (I-90)
2 States Served: Kentucky, Ohio
Associated routes: I-271, I-471
I-72.svg I-72 Hannibal, Missouri (US-61) to Champaign, Illinois (I-57)
2 States Served: Missouri, Illinois
Associated route: I-172
I-73.svg I-73 Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85)
North Carolina Intrastate Interstate
Associated routes: none
I-74.svg 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
I-74.svg I-74 East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52)
2 States Served: VA, NC. Planned: WV
Associated routes: none
I-75.svg 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
I-76.svg I-76 West Denver, Colorado (I-70) to Big Springs, Nebraska (I-80)
2 States Served: Colorado, Nebraska
Associated routes: none
I-76.svg 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
I-77.svg 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
I-78.svg 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*
I-79.svg I-79 Charleston, West Virginia (I-77) to Erie, Pennsylvania (PA-5)
2 States Served: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-80.svg 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
I-81.svg 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
I-82.svg I-82 Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84)
2 States Served: Washington, Oregon
Associated route: I-182
I-83.svg I-83 Baltimore, Maryland to Harrisburg, Pennsylvania (I-81)
2 States Served: Maryland, Pennsylvania
Associated route: I-283
I-84.svg I-84 West Portland, Oregon (I-5) to Echo, Utah (I-80)
3 States Served: Oregon, Idaho, Utah
Associated route: I-184
I-84.svg 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
I-85.svg 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
I-86.svg I-86 West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15)
Idaho Intrastate Interstate
Associated routes: none
I-86.svg I-86 East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17)
2 States Served: Pennsylvania, New York
Associated routes: none
I-87.svg I-87 New York, New York (I-278) to Champlain, New York (Canada)
New York Intrastate Interstate
Associated routes: I-287, I-587, I-787
I-88.svg I-88 West Barstow, Illinois (I-80) to Chicago, Illinois (I-290)
Illinois Intrastate Interstate
Associated routes: none
I-88.svg I-88 East Binghamton, New York (I-81) to Schenectady, New York (I-90)
New York Intrastate Interstate
Associated routes: none
I-89.svg I-89 Bow, New Hampshire (I-93) to Highgate Springs, Vermont (Canada)
2 States Served: New Hampshire, Vermont
Associated route: I-189
I-90.svg 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
I-91.svg 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
I-93.svg 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
I-94.svg 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
I-95.svg 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
I-96.svg I-96 Muskegon, Michigan (US-31) to Detroit, Michigan (I-75)
Michigan Intrastate Interstate
Associated routes: I-196, I-296*, I-496, I-696
I-97.svg I-97 Annapolis, Maryland (US-50) to Baltimore, Maryland (I-695)
Maryland Intrastate Interstate
Associated routes: none
I-99.svg I-99 Bedford, Pennsylvania (I-76) to Bellefonte, Pennsylvania (I-80)
Pennsylvania Intrastate Interstate
Associated routes: none

Interstates outside of the mainland[change | change source]

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[change | change source]

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.

Interstate Route Length (miles)[1]
I-H1.svg H-1
Kapolei, Hawaii (HI-93) to Honolulu, Hawaii (HI-72)
Associated route: H-201
I-H2.svg H-2
Pearl City, Hawaii (H-1) to Wahiawa, Hawaii (HI-99)
I-H3.svg H-3
Halawa, Hawaii (H-1 & H-201) to Marine Corps Base Hawaii

Alaska and Puerto Rico[change | change source]

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.

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[change | change source]

Map of the Interstates in 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[change | change source]

Map of the Interstates in 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[change | change source]

References[change | change source]

Other websites[change | change source]