List of Interstate Highways

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Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 80 marker Eisenhower Interstate System sign
Highway shield for Interstate 80

Interstate Highways in the 48 contiguous states
System information
Formed: June 29, 1956[1]
Highway names
Interstates: Interstate X (I-X)
System links

Primary Interstate Highways of the United States are numbered with one- or two-digit designations. Their associated auxiliary highways have three-digit numbers. Even route numbers are assigned to east–west routes, generally from south (e.g., I-2) to north (I-96), with coast-to-coast and other long-distance routes ending in '0'. Similarly, odd route numbers are assigned to north–south routes, from west (I-5) to east (I-99), with border-to-border and other long distance routes ending in '5'.

Five pairs of numbers are duplicated throughout the system; the corresponding highways are separated by large distances which prevent confusion. Below, these are differentiated from each other by "West" and "East". The main list is followed by sections listing the primary Interstate highways in Alaska, Hawaii, and Puerto Rico.

Primary Interstate Highways[edit]

There are 66 primary Interstate Highways listed in the table below, and 43 of them have auxiliary routes. Listed lengths are as of October 31, 2002.

Routes ending in 0 or 5 are highlighted in green, while unfinished or proposed routes are highlighted in grey.

Interstate Route Length (mi)[2]
I-2.svg I-2 Palmview, Texas (US 83) to Harlingen, Texas (I-69E /US 77)
Texas Intrastate Interstate
Associated routes: none
I-4.svg I-4 Tampa, Florida (I-275) to Daytona Beach, Florida (I-95 / SR 400)
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 Boulevard / Nimitz Boulevard) to Casa Grande, Arizona (I-10)
2 states served: CA, AZ
Associated routes: none
I-10.svg I-10 Santa Monica, California (SR 1) to Jacksonville, Florida (I-95 / US 17 / SR 228)
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 (US 17 / GA 404 / Montgomery Street)
Georgia Intrastate Interstate
Associated route: I-516
I-17.svg I-17 Phoenix, Arizona (I-10) to Flagstaff, Arizona (I-40 / 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 San Martine, Texas between Kent and Toyah (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 in 1 more: Tennessee
Planned associated route: I-422
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 / US 87)
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 / Loop 289) to Amarillo, Texas (I-40 / US 87 / US 287)
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 / US 65 / US 67 / US 167)
2 states served: Texas, Arkansas
Associated routes: I-430, I-530, I-630
I-35.svg I-35 Laredo, Texas (US 83 / US 59 as well as Mexico and MX-85) to Duluth, Minnesota (MN-61 / LSCT / 26 th Avenue)
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 / US 281)
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 (US 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
I-43.svg I-43 Beloit, Wisconsin (I-39 / I-90) to Howard, Wisconsin (US 41 / US 141)
Wisconsin Intrastate Interstate
Associated routes: none
I-44.svg I-44 Wichita Falls, Texas (US 82 / US 277 / US 281 / 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 Kansas City, Missouri (I-435 / I-470)
Unfinished Arkansas section: Doddridge, Arkansas (US 71) to Texarkana, Arkansas (US 59 / US 71)
2 states served: Louisiana, Arkansas, Missouri
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 Front Royal, Virginia (I-81) to Washington, D.C. (US 29)
Future states served: Kansas, Missouri, Illinois, Kentucky, West Virginia 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 Banks, Mississippi (MS 713) to Port Huron, Michigan (Canada and Hwy 402)
Unfinished Texas section: Rosenberg (US-59 / Spur 529) to Splendora (US 59 / Mandell Road)
Unfinished Mississippi-Tennessee section: Banks, Mississippi (MS 304 / MS 713) to Frayser, Tennessee (US 51 / TN 3
Unfinished Indiana section: Elberfeld, Indiana (I-64 / I-164) to Scotland, Indiana (U.S. Highway 231)
5 states served: MS, TN, KY, IN, MI. Planned/started in 3 more: TX, LA, AR
Associated routes: I-69C, I-69E, I-369, I-469; Future: I-69W, I-269; Planned: I-369 in Kentucky
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 Sault Ste. Marie, Michigan (Canada future) to Briarcliffe Acres, South Carolina (US 17 future)
6 states served: MI (future), OH (future), WV (future), VA (future), NC, SC (future)
Associated routes: none
I-74.svg I-74 Bettendorf, Iowa (I-80) to Garden City, South Carolina (US 17 Bus. future)
8 states served: IA, IL, IN, OH, WV (future), VA (future), NC, SC (future)
Associated routes: I-274 (future), I-474
I-75.svg I-75 Hialeah, Florida (SR 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 City
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 (US 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-381, I-481, I-581, I-781
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; Planned: I-685
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 City (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/I-895)
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

Interstate Highways outside of the mainland[edit]

In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico.

Hawaiian Interstate Highways[edit]

The Interstate Highways in 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.

Interstate Route Length (mi)[2]
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) 8.33
I-H3.svg H-3 Halawa, Hawaii (H-1 & H-201) to Marine Corps Base Hawaii 15.32

Alaska and Puerto Rico[edit]

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.[4]


Map of the Interstates in Alaska

Alaska's Interstate Highways are unsigned, although they all have state highway numbers that do not match the Interstate Highway numbers.[5]

Puerto Rico[edit]

Map of the Interstates in Puerto Rico

Like Alaska, Puerto Rico signs its Interstate Highways as territorial routes, and the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.[6]

See also[edit]


  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads (Washington, DC: Federal Highway Administration) 60 (1). Retrieved March 16, 2012. 
  2. ^ a b Federal Highway Administration Route Log and Finder List - Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002
  3. ^ "Google Maps driving directions". Retrieved April 4, 2010. 
  4. ^ Federal Highway Administration. "FHWA Route Log and Finder List". Retrieved May 24, 2007. 
  5. ^ Voss, Oscar. "Alaska Roads: Interstate ends photos". Retrieved May 24, 2007. 
  6. ^ Voss, Oscar. "Puerto Rico road photos". Retrieved May 24, 2007. 

External links[edit]