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List of Interstate Highways



There are 70 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. They are assigned one- or two-digit route numbers, whereas their associated "auxiliary" Interstate Highways receive three-digit route numbers. Typically, odd-numbered Interstates run south-north, with lower numbers in the west and higher numbers in the east; even-numbered Interstates run west-east, with lower numbers in the south and higher numbers in the north. Highways whose route numbers are divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 travels from Santa Monica, California, to Jacksonville, Florida, traveling from the Pacific to Atlantic oceans). Additionally, auxiliary highways have their numbering system where a different number prefixes the number of its parent highway.

Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 90 markerEisenhower Interstate System sign
Highway shield for Interstate 90 and the Eisenhower Interstate System
Interstate Highways in the 48 contiguous states
System information
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate X (I-X)
System links

Five route numbers are duplicated in the system, though the corresponding highways are separated by state lines which prevent confusion. The main list that discusses the primary Interstate Highways in the contiguous United States is followed by sections regarding Alaska, Hawaii, and Puerto Rico.


Contiguous United States

There are 70 primary Interstate Highways listed in the table below.

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-2 46.80 75.32 US 83 in Peñitas, Texas I-69E/US 77/US 83 in Harlingen, Texas 2013 current Texas only
Associated routes: none
I-4 132.30 212.92 I-275 in Tampa, Florida I-95/SR 400 Daytona Beach, Florida 1959 current Florida only
Associated routes: none
I-5 1,381.29 2,222.97 Fed. 1 at Mexican border in San Ysidro, California BC 99 at Canadian border in Blaine, Washington 1956 current Serves three states: California, Oregon, Washington
Associated routes: I-105, I-205, I-405, I-505, I-605, I-705, I-805; Future: I-305, I-905
I-8 348.25 560.45 Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, California I-10 in Casa Grande, Arizona 1964 current Serves two states: California, Arizona
Associated routes: none
I-10 2,460.34 3,959.53 SR 1 in Santa Monica, California I-95/US 17/SR 228 in Jacksonville, Florida 1957 current Serves eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida
Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910
I-11 22.60 36.37 US 93 at Arizona state line near Boulder City, Nevada I-215/I-515/US 93/US 95/SR 564 in Henderson, Nevada 2017 current Nevada only; planned extension north and south
Associated routes: none
I-12 85.59 137.74 I-10 in Baton Rouge, Louisiana I-10/I-59 in Slidell, Louisiana 1967 current Louisiana only
Associated routes: none
I-14 25.10 40.39 US 190/SH 9 in Copperas Cove, Texas I-35 in Belton, Texas 2017 current Texas only; planned extension east and west
Associated routes: none
I-15 1,433.52 2,307.03 I-8/SR 15 in San Diego, California Hwy. 4 at Canadian border in Sweetgrass, Montana 1957 current Serves six states: California, Nevada, Arizona, Utah, Idaho, Montana
Associated routes: I-115, I-215, I-315, I-515
I-16 166.81 268.45 I-75 in Macon, Georgia SR 404 and Montgomery Street/Martin Luther King Jr. Boulevard in Savannah, Georgia 1966 current Georgia only
Associated route: I-516
I-17 145.76 234.58 I-10 in Phoenix, Arizona I-40/SR 89A in Flagstaff, Arizona 1961 current Arizona only
Associated routes: none
I-19 63.35 101.95 Fed. 15 at Mexican border in Nogales, Arizona I-10 in Tucson, Arizona 1972 current Arizona only
Associated routes: none
Uses kilometers instead of miles
I-20 1,539.38 2,477.39 I-10 at Scroggins Draw, Texas I-95 in Florence, South Carolina 1957 current Serves six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina
Associated routes: I-220, I-520, I-820
I-22 202.22 325.44 I-269/US 78 near Byhalia, Mississippi I-65/US 31 in Birmingham, Alabama 2012 current Serves two states: Mississippi, Alabama
Planned associated routes: I-222, I-422
I-24 316.36 509.13 I-57 in Pulley's Mill, Illinois I-75 in Chattanooga, Tennessee 1962 current Serves four states: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
I-25 1,061.67 1,708.59 I-10/US 85/US 180 in Las Cruces, New Mexico I-90/US 87 in Buffalo, Wyoming 1957 current Serves three states: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26 304.64 490.27 US 11W/US 23 in Kingsport, Tennessee US 17 in Charleston, South Carolina 1960 current Serves three states: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
I-27 124.13 199.77 US 87/Loop 289 in Lubbock, Texas I-40/US 87/US 287 in Amarillo, Texas 1969 current Texas only
Associated routes: none
I-29 755.51 1,215.88 I-35/I-70/US 24/US 40/US 71 in Kansas City, Missouri US 81 and PTH 29 at Canadian border in Pembina, North Dakota 1958 current Serves four states: Missouri, Iowa, South Dakota, North Dakota
Associated routes: I-129, I-229
I-30 366.76 590.24 I-20 in Fort Worth, Texas I-40/US 65/US 67/US 167 in North Little Rock, Arkansas 1957 current Serves two states: Texas, Arkansas
Associated routes: I-430, I-530, I-630
I-31 157 253 Fargo, North Dakota Canadian border 1957 1958 Now part of I-29
I-35 1,568.38 2,524.06 US 83/SH 359/BS I-35 and MX-85 at Mexican border in Laredo, Texas MN 61/LSCT/26th Avenue in Duluth, Minnesota 1956 current Serves six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota
Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635
I-37 143.00 230.14 US 181 in Corpus Christi, Texas I-35/US 281 in San Antonio, Texas 1959 current Texas only
Associated routes: none
I-39 306.14 492.68 I-55 in Normal, Illinois WIS 29/US 51 in Wausau, Wisconsin 1984 current Serves two states: Illinois, Wisconsin
Associated routes: none
I-40 2,556.61 4,114.46 I-15 in Barstow, California US 117/NC 132 in Wilmington, North Carolina 1964 current Serves eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina
Associated routes: I-140, I-240, I-440, I-540, I-640, I-840
I-41 175.00 281.64 I-94/US 41 in Russell, Illinois I-43 in Howard, Wisconsin 2015 current Serves two states: Illinois, Wisconsin
Associated routes: none
I-43 191.55 308.27 I-39/I-90 in Beloit, Wisconsin I-41/US 41/US 141 in Howard, Wisconsin 1981 current Wisconsin only
Associated routes: none
I-44 636.69 1,024.65 US 82/US 277/US 281/US 287 in Wichita Falls, Texas I-70 in St. Louis, Missouri 1958 current Serves three states: Texas, Oklahoma, Missouri
Associated routes: I-244, I-444
I-45 284.91 458.52 SH 87 in Galveston, Texas I-30/US 67/US 75 in Dallas, Texas 1971 current Texas only
Associated route: I-345
I-49 528.02 849.77 I-10 in Lafayette, Louisiana I-435/I-470/US 50/US 71 in Kansas City, Missouri 1984 current Serves three states: Louisiana, Arkansas, Missouri
Associated routes: none
I-55 964.25 1,551.81 I-10 in LaPlace, Louisiana US 41 in Chicago, Illinois 1960 current Serves six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Associated routes: I-155, I-255, I-355; I-555
I-57 386.12 621.40 I-55 in Miner, Missouri I-94 in Chicago, Illinois 1965 current Serves two states:
Missouri, Illinois; planned in 1 more: Arkansas
Associated routes: none
I-59 445.23 716.53 I-10/I-12 in Slidell, Louisiana I-24 in Wildwood, Georgia 1960 current Serves four states: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
I-64 963.52 1,550.64 I-70/US 61 in Wentzville, Missouri I-264/I-664 in Chesapeake, Virginia 1961 current Serves six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia
Associated routes: I-264, I-464, I-564, I-664
I-65 887.30 1,427.97 I-10 in Mobile, Alabama US 12/US 20 in Gary, Indiana 1958 current Serves four states: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865
I-66 76.28 122.76 I-81 in Front Royal, Virginia US 29 in Washington, D.C. 1961 current Serves DC and one state: Virginia
Associated routes: None, had one proposed auxiliary route, I-266, but was cancelled due to freeway revolts.
I-66 Wichita, Kansas Middletown, Virginia 1991 2015 Proposed, never built
I-68 113.15 182.10 I-79 in Morgantown, West Virginia I-70 in Hancock, Maryland 1991 current Serves two states: West Virginia, Maryland
Associated routes: None
I-69 721.57 1,161.25 I-69E/US 77 & I-69W/US 59 in Victoria, Texas (future) Hwy 402 at Canadian border in Port Huron, Michigan 1957 current 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: Martinsville, Indiana to Indianapolis, Indiana
Serves six states: Texas, Mississippi, Tennessee, Kentucky, Indiana, Michigan. Planned/started in 2 more: Louisiana, Arkansas
Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-169 in Tennessee, I-369 in Kentucky
I-70 2,172.16 3,495.75 I-15 in Cove Fort, Utah Park and ride in Baltimore, Maryland 1956 current Serves 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland
Associated routes: I-170, I-270, I-370, I-470, I-670
I-71 345.57 556.14 I-64 in Louisville, Kentucky I-90 in Cleveland, Ohio 1959 current Serves two states: Kentucky, Ohio
Associated routes: I-271, I-471
I-72 179.29 288.54 US 61 in Hannibal, Missouri Church Street and University Avenue in Champaign, Illinois 1970 current Serves two states: Missouri, Illinois
Associated route: I-172
I-73 99.43 160.02 US 220 near Stokesdale, North Carolina I‑74 and US 220 in Randleman, North Carolina 1997 current North Carolina only; planned extension north and south
Associated routes: none
I-74 491.74 791.38 I-80 in Bettendorf, Iowa US 74/NC 41 near Lumberton, North Carolina 1974 current Serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina
Associated routes: I-474
I-75 1,786.47 2,875.04 SR 826/SR 916/SR 924 in Miami Lakes, Florida Canadian border at Sault Ste. Marie, Michigan 1958 current Serves six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I-76 186.48 300.11 I-70 at Denver, Colorado I-80 at Big Springs, Nebraska 1975 current Serves two states: Colorado, Nebraska
Associated routes: none
I-76 435.66 701.13 I-71 in Westfield Center, Ohio I-295 at Bellmawr, New Jersey 1964 current Serves three states: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676; Future: I-576
I-77 610.10 981.86 I-26 in Columbia, South Carolina I-90 in Cleveland, Ohio 1958 current Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated route: I-277
I-78 146.28 235.41 I-81 at Jonestown, Pennsylvania Canal Street in New York City 1957 current Serves three states: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478, I-678, I-878
I-79 343.46 552.75 I-77 in Charleston, West Virginia PA 5 in Erie, Pennsylvania 1967 current Serves two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-80 2,899.59 4,666.44 US 101 in San Francisco, California I-95 in Teaneck, New Jersey 1956 current Serves 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey
Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
I-81 855.02 1,376.02 I-40 in Dandridge, Tennessee Canadian border at Wellesley Island, New York 1961 current Serves six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York
Associated routes: I-381, I-481, I-581, I-781
I-82 143.58 231.07 I-90 in Ellensburg, Washington I-84 in Hermiston, Oregon 1957 current Serves two states: Washington, Oregon
Associated route: I-182
I-83 85.03 136.84 President Street and Fayette Street in Baltimore, Maryland I-81 in Harrisburg, Pennsylvania 1959 current Serves two states: Maryland, Pennsylvania
Associated route: I-283
I-84 769.62 1,238.58 I-5 in Portland, Oregon I-80 in Echo, Utah 1980 current Serves three states: Oregon, Idaho, Utah
Associated route: I-184
I-84 232.71 374.51 I-81 in Scranton, Pennsylvania I-90 in Sturbridge, Massachusetts 1963 current Serves four states: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684
I-85 666.05 1,071.90 I-65 in Montgomery, Alabama I-95 in Petersburg, Virginia 1958 current Serves five states: 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 62.85 101.15 I-84 near Declo, Idaho I-15 in Chubbuck, Idaho 1980 current Idaho only
Associated routes: none
I-86 223.39 359.51 I-90 near North East, Pennsylvania NY 17/NY 79 in Windsor, New York 1999 current Unfinished New York section: Waverly (NY 34) to Kirkwood (I-81)
Serves two states: Pennsylvania, New York
Associated routes: none
I-87 12.90 20.76 I-440/US 64/US 264 in Raleigh, North Carolina US 64/US 264 in Wendell, North Carolina 2017 current North Carolina only
Associated routes: None, will eventually have one spur route, I-587; shortest Interstate highway in contiguous United States
I-87 333.49 536.70 I-278 in New York City A-15 at Canadian border in Champlain, New York 1957 current New York only
Associated routes: I-287, I-587, I-787
I-88 140.60 226.27 I-80/IL 92 near East Moline, Illinois I-290/IL 110 in Hillside, Illinois 1987 current Illinois only
Associated routes: none
I-88 117.75 189.50 I-81 in Binghamton, New York I-90 in Schenectady, New York 1968 current New York only
Associated routes: none
I-89 191.12 307.58 I-93/SR 3A in Bow, New Hampshire Route 133/Future A-35 at Canadian border in Highgate, Vermont 1960 current Serves two states: New Hampshire, Vermont
Associated route: I-189
I-90 3,020.44 4,860.93 SR 519/4th Avenue/Edgar Martinez Drive in Seattle, Washington MA 1A in Boston, Massachusetts 1956 current Serves 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts
Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990
Longest Interstate highway
I-91 290.37 467.31 I-95 in New Haven, Connecticut A-55 at Canadian border in Derby Line, Vermont 1958 current Serves three states: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691
I-93 189.95 305.69 I-95/US 1 in Canton, Massachusetts I-91 in St. Johnsbury, Vermont 1957 current Serves three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
I-94 1,585.20 2,551.13 I-90 in Lockwood, Montana Highway 402 at Canadian border in Port Huron, Michigan 1956 current Serves seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan
Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894
I-95 1,919.31 3,088.83 US 1 in Miami, Florida NB 95 at Canadian border in Houlton, Maine 1957 current Serves DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine
Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895
Longest primarily north-south Interstate highway
I-96 192.06 309.09 US 31 in Norton Shores, Michigan I-75 in Detroit, Michigan 1959 current Michigan only
Associated routes: I-196, I-296, I-496, I-696
I-97 17.62 28.36 US 50 in Annapolis, Maryland I-695/I-895 in Glen Burnie, Maryland 1987 current Maryland only
Associated routes: None, had 2 auxiliary routes planned, I-197 and I-297, but they were replaced by I-595 and MD Route 3.
I-99 98.34 158.26 I-70/I-76 in Bedford, Pennsylvania I-86/NY 17 in Painted Post, New York 1998 current Unfinished Pennsylvania section: Bellefonte, Pennsylvania (I-80) to New York state line near Lawrenceville, Pennsylvania (US 15)
Serves two states: Pennsylvania, New York
Associated routes: none
  •       Former

Other jurisdictions

In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. 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.[3]

Hawaii

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.

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
H-1 27.16 43.71 Route 93 in Kapolei Route 72 in Honolulu 1959 current Associated route: H-201
H-2 8.33 13.41 H-1 in Pearl City Route 99 in Wahiawa 1976 current
H-3 15.32 24.66 H-1 & H-201 in Halawa Marine Corps Base Hawaii 1997 current
H-4 6.5 10.5 Was to have provided relief around the congested areas of H-1, but the idea was not popular and was never built.
  •       Former

Alaska

Map of the Interstates in Alaska

Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers.[4]

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
A-1 408.23 656.98 Anchorage Canadian border in Alcan Border 1976 current Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway[5][6][7][8]
A-2 202.18 325.38 Tok Fairbanks 1976 current Alaska Highway, Richardson Highway[6][7][8]
A-3 148.12 238.38 Anchorage Soldotna 1976 current Seward Highway, Sterling Highway[5][7][8]
A-4 323.69 520.93 Gateway, near Palmer Fairbanks 1976 current Parks Highway[5][6][7][8]

Puerto Rico

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.[9]

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
PRI-1 71.08 114.39 PR-2 in Ponce PR-2 in San Juan 1953 current Follows PR-52
PRI-2 138.13 222.30 PR-1 in Ponce PR-3 in San Juan 1953 current Follows PR-22
PRI-3 40.56 65.27 PR-3 in Humacao PR-2 in San Juan 1953 current Follows PR-66

In popular culture

The title of interactive fiction I-0 refers to the fictional "Interstate Zero".[10] A fictional highway is depicted in the movie Interstate 60.


See also

  • Blank shield.svg U.S. Roads portal

References

  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 c d "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018" . FHWA Route Log and Finder List. Federal Highway Administration. May 6, 2019. Retrieved April 21, 2021.
  3. ^ Staff. "FHWA Route Log and Finder List" . Federal Highway Administration. Retrieved May 24, 2007.
  4. ^ Voss, Oscar. "Alaska Roads: Interstate ends photos" . Retrieved May 24, 2007.
  5. ^ a b c Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.
  6. ^ a b c Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
  7. ^ a b c d Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Retrieved May 31, 2012.
  8. ^ a b c d Staff. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). Federal Highway Administration. Retrieved May 31, 2012.
  9. ^ Voss, Oscar. "Puerto Rico road photos" . Retrieved May 24, 2007.
  10. ^ "I-0" . Interactive Fiction Database. Retrieved February 1, 2016.

External links





Source


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