List of Interstate Highways

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Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 80 marker
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

This list includes the primary (one- and two- digit) Interstate Highways of the United States, with cross-references to their associated auxiliary (3-digit) routes. Even route numbers are assigned to east–west routes, generally from south (e.g., I-4) 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. Separate articles list auxiliary (3-digit) interstates and business routes.

Contents

Primary Interstate Highways [edit]

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, while unfinished or proposed routes are highlighted in grey.

Interstate
 Route, States Served & Associated routes
(* not signposted as interstates) (sort by number of states served)		 Length[2]
(mi.)
I-4.svg I-4 Tampa, Florida (I-275) to Daytona Beach, Florida (I-95 / FL 400)
Florida Intrastate Interstate
Associated routes: none		 132.3
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		 1,381.29
I-8.svg I-8 San Diego, California (Sunset Cliffs Boulevard / Dimitz Boulevard) to Casa Grande, Arizona (I-10)
2 States Served: CA, AZ
Associated routes: none		 348.25
I-10.svg I-10 Santa Monica, California (CA-1) to Jacksonville, Florida (I-95 / US 17 / FL 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*		 2,460.34
I-12.svg I-12 Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59)
Louisiana Intrastate Interstate
Associated routes: none		 85.59
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		 1,433.52
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		 166.81
I-17.svg I-17 Phoenix, Arizona (I-10) to Flagstaff, Arizona (I-40 / AZ-89A)
Arizona Intrastate Interstate
Associated routes: none		 145.76
I-19.svg I-19 Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10)
Arizona Intrastate Interstate
Associated routes: none		 63.6
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		 1,539.38
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		 213
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		 316.36
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		 1,062.77
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		 349[3]
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		 124.13
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		 755.51
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		 366.76
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		 1,568.38
I-37.svg I-37 Corpus Christi, Texas (US 181) to San Antonio, Texas (I-35 / US 281)
Texas Intrastate Interstate
Associated routes: none		 143.00
I-39.svg 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.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		 2,554.10
I-43.svg I-43 Beloit, Wisconsin (I-39 / I-90) to Howard, Wisconsin (US 41 / US 141)
Wisconsin Intrastate Interstate
Associated routes: none		 191.55
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*		 633.79
I-45.svg I-45 Galveston, Texas (TX 87) to Dallas, Texas (I-30)
Texas Intrastate Interstate
Associated route: I-345*		 284.91
I-49.svg I-49 Lafayette, Louisiana (I-10) to Kansas City, Missouri (I-435)
2 States Served: Louisiana, Missouri
Associated routes: none		 388.25
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		 964.25
I-57.svg I-57 Miner, Missouri (I-55) to Chicago, Illinois (I-94)
2 States Served: Missouri, Illinois
Associated routes: none		 386.12
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		 445.23
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		 953.74
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		 887.30
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		 76.28
I-68.svg I-68 Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70)
2 States Served: West Virginia, Maryland
Associated routes: none		 112.9
I-69.svg I-69 Unfinished sectors:
Robstown, Texas (US 77 / TX-44 to Corpus Christi, Texas (I-37 / US 77)
Rosenburg, Texas (US 59 / Spur 529 to Splendora, Texas (US 59 / Mandell Road)
Banks, Mississippi (MS 713) to Port Huron, Michigan (Canada and Hwy 402)
5 States Served: MS, TN, KY, IN, MI. Planned/started in 3 more: TX, LA, AR
Associated route: I-469; Future: I-269; Planned: I-369		 458.12
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		 2,153.13
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		 343.78
I-72.svg I-72 Hannibal, Missouri (US 61) to Champaign, Illinois (I-57)
2 States Served: Missouri, Illinois
Associated route: I-172		 179.29
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		 33.5
I-74.svg I-74 West Bettendorf, Iowa (I-80) to Cincinnati, Ohio (I-75)
4 States Served: IA, IL, IN, OH
Associated route: I-474		 428.81
I-74.svg I-74 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.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		 1,786.47
I-76.svg 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.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		 434.36
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		 610.10
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*		 143.56
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		 343.24
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		 2,899.54
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		 854.89
I-82.svg I-82 Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84)
2 States Served: Washington, Oregon
Associated route: I-182		 143.58
I-83.svg I-83 Baltimore, Maryland to Harrisburg, Pennsylvania (I-81)
2 States Served: Maryland, Pennsylvania
Associated route: I-283		 85.3
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		 769.62
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		 232.4
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		 668.75
I-86.svg I-86 West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15)
Idaho Intrastate Interstate
Associated routes: none		 62.85
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		 183.56
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		 333.49
I-88.svg I-88 West Barstow, Illinois (I-80) to Chicago, Illinois (I-290)
Illinois Intrastate Interstate
Associated routes: none		 140.6
I-88.svg 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.svg 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.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		 3,101.77
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		 290.37
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		 189.95
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		 1,585.20
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		 1,925.74
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		 192.06
I-97.svg I-97 Annapolis, Maryland (US 50) to Baltimore, Maryland (I-65)
Maryland Intrastate Interstate
Associated routes: none		 17.62
I-99.svg I-99 Bedford, Pennsylvania (I-76) to Bellefonte, Pennsylvania (I-80)
Pennsylvania Intrastate Interstate
Associated routes: none		 85.0

Interstate Highways outside of the mainland [edit]

Interstate Highways not only reside in the contiguous 48 states of the United States, as there are also Interstate Highways 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 (miles)[2]
I-H1.svg H-1
 		 Kapolei, Hawaii (HI-93) to Honolulu, Hawaii (HI-72)
Associated route: H-201		 27.16
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] ”

Alaska [edit]

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]

Portal icon U.S. Roads portal

References [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 2010-04-04. 
  4. ^ Federal Highway Administration. "FHWA Route Log and Finder List". Retrieved 2007-05-24. ]
  5. ^ Voss, Oscar. "Alaska Roads - Interstate ends photos". Retrieved 2007-05-24. 
  6. ^ Voss, Oscar. "Puerto Rico road photos". Retrieved 2007-05-24. 

External links [edit]
Signed
Unsigned
Lists
Primary
Auxiliary
Other
Major Interstates highlighted
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