List of Interstate Highways

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Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 90 marker Eisenhower Interstate System sign
Highway shield for Interstate 90 and the Eisenhower Interstate System
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. Generally, odd-numbered routes run north-south, with lower numbers in the west and higher numbers in the east; even-numbered routes run east-west, with lower numbers in the south and higher numbers in the north. Routes divisible by "5" (for example, I-40 or I-75) are major routes, often running coast-to-coast or border-to-border.

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 68 primary Interstate Highways listed in the table below, and 43 of them have auxiliary routes.

Number Length (mi)[2] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I‑2 46.8 75.3 US 83 in Penitas, Texas I-69E/US 77/US 83 in Harlingen, Texas 2013 current Texas only
Associated routes: none
I‑4 132.3 212.9 I-275 in Tampa, Florida I-95/SR 400 Daytona Beach, Florida 1957 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: CA, OR, WA
Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Future: 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: CA, AZ
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: 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 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 25.90 41.68 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: CA, NV, AZ, UT, ID, MT
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 1972 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 63.6 102.4 Fed. 15 at Mexican border in Nogales, Arizona Tucson, Arizona (I-10) 1972 current Arizona only
Associated routes: none
I‑20 1,539.38 2,477.39 I-10 between Kent and Toyah, Texas I-95 in Florence, South Carolina 1957 current Serves six states: TX, LA, MS, AL, GA, SC
Associated routes: I-220, I-520, I-820
I‑22 213.0 342.8 Future Interstate 269/US 78 near Byhalia 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 1,062.77 1,710.36 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‑26 305.62 491.85 US 11W 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 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; Planned: I-130
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: 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‑37 143.00 230.14 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 2,555.10 4,112.03 I-15 in Barstow, California US 117/NC 132 in Wilmington, North Carolina 1964 current Serves eight states: CA, AZ, NM, TX, OK, AR, TN, NC
Associated routes: I-140, I-240, I-440, I-540, I-640, I-840
I‑41 176.33 283.78 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‑44 633.79 1,019.99 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 in Dallas, Texas 1971 current Texas only
Associated route: I-345
I‑49 388.25 624.83 I-10 in Lafayette, Louisiana I-435 in Kansas City, Missouri 1984 current Unfinished Louisiana–Arkansas section: Blanchard, Louisiana (LA 1) to Texarkana, Arkansas (US 59/US 71)
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: LA, MS, TN, AR, MO, IL
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
Associated routes: none
I‑59 445.23 716.53 I-10/I-12 in Slidell, Louisiana I-24 in Lookout Mountain, Georgia 1960 current Serves four states: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
I‑64 953.74 1,534.90 I-70 in Wentzville, Missouri I-264/I-664 in Chesapeake, Virginia 1961 current Serves six states: MO, IL, IN, KY, WV, VA
Associated routes: I-264, I-464, I-564, I-664
I‑65 887.30 1,427.97 Mobile, Alabama (I-10) Gary, Indiana (I-90) 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. 1982 current Serves two states: Virginia, District of Columbia
Associated routes: none
I‑68 112.9 181.7 I-79 in Morgantown, West Virginia I-70 in Hancock, Maryland 1991 current Serves two states: West Virginia, Maryland
Associated routes: none
I‑69 705.40 1,135.23 I-69E/US 77 & I-69W/US 59 in Victoria, Texas () 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: Bloomington, Indiana to Indianapolis, Indiana
Serves six states: TX, MS, TN, KY, IN, MI. Planned/started in 2 more: LA, AR
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 2,153.13 3,465.13 I-15 in Cove Fort, Utah Park and ride in Baltimore, Maryland 1956 current Serves 10 states: UT, CO, KS, MO, IL, IN, OH, WV, PA, MD
Associated routes: I-170, I-270, I-370, I-470, I-670
I‑71 343.78 553.26 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 I-57 in Champaign, Illinois 1970 current Serves two states: Missouri, Illinois
Associated route: I-172
I‑73 82.4 132.6 US 220 near Ellerbe, North Carolina I‑840/Bryan Boulevard in Greensboro, North Carolina 1997 current North Carolina only
Associated routes: none
I‑74 440.91 709.58 I-80 in Bettendorf, Iowa NC 41 near Lumberton, North Carolina 1974 current Serves six states: IA, IL, IN, OH, NC
Associated routes: I-474
I‑75 1,786.47 2,875.04 Hialeah, Florida (SR 826) Sault Ste. Marie, Michigan (Canada) 1958 current Serves six states: FL, GA, TN, KY, OH, MI
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I‑76 187.34 301.49 West Denver, Colorado (I-70) Big Springs, Nebraska (I-80) 1975 current Serves two states: Colorado, Nebraska
Associated routes: none
I‑76 434.36 699.03 East Westfield Center, Ohio (I-71) Bellmawr, New Jersey (I-295) 1976 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 Columbia, South Carolina (I-26) Cleveland, Ohio (I-90) 1958 current Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated route: I-277
I‑78 143.56 231.04 Union Township, Pennsylvania (I-81) New York City 1957 current Serves three states: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478, I-678, I-878
I‑79 343.24 552.39 Charleston, West Virginia (I-77) Erie, Pennsylvania (PA-5) 1967 current Serves two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I‑80 2,899.54 4,666.36 San Francisco, California (US 101) Teaneck, New Jersey (I-95) 1956 current Serves 11 states: CA, NV, UT, WY, NE, IA, IL, IN, OH, PA, NJ
Associated routes: I-180, I-238 I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
I‑81 854.89 1,375.81 Dandridge, Tennessee (I-40) Fisher's Landing, New York (Canada) 1961 current Serves six states: TN, VA, WV, MD, PA, NY
Associated routes: I-381, I-481, I-581, I-781
I‑82 143.58 231.07 Ellensburg, Washington (I-90) Hermiston, Oregon (I-84) 1956 current Serves two states: Washington, Oregon
Associated route: I-182
I‑83 85.3 137.3 Baltimore, Maryland Harrisburg, Pennsylvania (I-81) 1959 current Serves two states: Maryland, Pennsylvania
Associated route: I-283
I‑84 769.62 1,238.58 West Portland, Oregon (I-5) Echo, Utah (I-80) 1980 current Serves three states: Oregon, Idaho, Utah
Associated route: I-184
I‑84 232.4 374.0 East Scranton, Pennsylvania (I-81) Sturbridge, Massachusetts (I-90) 1963 current Serves four states: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684
I‑85 668.75 1,076.25 Montgomery, Alabama (I-65) Petersburg, Virginia (I-95) 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 West Heyburn, Idaho (I-84) Pocatello, Idaho (I-15) 1980 current Idaho only
Associated routes: none
I‑86 183.56 295.41 East Erie, Pennsylvania (I-90) Woodbury, New York (I-87 future) 1999 current Serves two states: Pennsylvania, New York
Associated routes: none
I‑87 333.49 536.70 New York City (I-278) Champlain, New York (A-15 at Canadian border) 1957 current New York only
Associated routes: I-287, I-587, I-787
I‑88 140.6 226.3 West Barstow, Illinois (I-80) Hillside, Illinois (I-290) 1987 current Illinois only
Associated routes: none
I‑88 117.75 189.50 East Binghamton, New York (I-81) Schenectady, New York (I-90) 1968 current New York only
Associated routes: none
I‑89 191.12 307.58 Bow, New Hampshire (I-93) Highgate Springs, Vermont (Route 133 at Canadian border/future A-35) 1960 current Serves two states: New Hampshire, Vermont
Associated route: I-189
I‑90 3,020.54 4,861.09 Seattle, Washington (WA 519) Boston, Massachusetts (MA 1A) 1956 current Serves 13 states: 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‑91 290.37 467.31 New Haven, Connecticut/North Haven, Connecticut (I-95) Derby Line, Vermont (A-55 at Canadian border) 1958 current Serves three states: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691
I‑93 189.95 305.69 Canton, Massachusetts (I-95) St. Johnsbury, Vermont (I-91) 1957 current Serves three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
I‑94 1,585.20 2,551.13 Billings, Montana (I-90) Port Huron, Michigan (Hwy 402 at Canadian border) 1956 current Serves seven states: 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 1,925.74 3,099.18 Miami, Florida (US 1) Houlton, Maine (Route 95 at Canadian border) 1957 current Serves 15 states: 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‑96 192.06 309.09 Muskegon, Michigan (US 31) Detroit, Michigan (I-75) 1959 current Michigan only
Associated routes: I-196, I-296, I-496, I-696
I‑97 17.62 28.36 Annapolis, Maryland (US 50) Baltimore, Maryland (I-695/I-895) 1987 current Maryland only
Associated routes: none
I‑99 98.86 159.10 Bedford, Pennsylvania (I-70/I-76) Painted Post, New York (I-86) 1998 current Unfinished Pennsylvania section: Bellefonte, Pennsylvania (I-80) to New York border near Lawrenceville, Pennsylvania (US 15)
Serves two states: Pennsylvania, New York
Associated routes: none

Other Interstate Highways[edit]

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:

Hawaii[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.

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

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.[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[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.[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 (PR 22/PR 18 interchange)
PRI-2 138.13 222.30 PR-1 in Ponce PR-3 in San Juan (PR 1/PR 26 interchange)
PRI-3 65.27 105.04 PR-3 in Humacao PR-2 in San Juan (PR 1/PR 26/PR 66 interchange)

In popular culture[edit]

The title of interactive fiction I-0 refers to the fictional "Interstate Zero".[10]

See also[edit]

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 c d 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. 
  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. 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 1 February 2016. 

External links[edit]