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 67 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 Palmview, Texas (US 83) Harlingen, Texas (I-69E / US 77 / US 83) 2013 current Texas only
Associated routes: none
I-4 132.3 212.9 Tampa, Florida (I-275) Daytona Beach, Florida (I-95 / SR 400) 1957 current Florida only
Associated routes: none
I-5 1,381.29 2,222.97 San Ysidro, California (MX-1 in Mexico) Blaine, Washington (BC 99 in Canada) 1956 current 3 states served: 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 San Diego, California (Sunset Cliffs Boulevard / Nimitz Boulevard) Casa Grande, Arizona (I-10) 1964 current 2 states served: CA, AZ
Associated routes: none
I-10 2,460.34 3,959.53 Santa Monica, California (SR 1) Jacksonville, Florida (I-95 / US 17 / SR 228) 1957 current 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 85.59 137.74 Baton Rouge, Louisiana (I-10) Slidell, Louisiana (I-10 / I-59) 1967 current Louisiana only
Associated routes: none
I-15 1,433.52 2,307.03 San Diego, California (I-8 / CA-15) Sweetgrass, Montana (Hwy 4 in Canada) 1957 current 6 states served: CA, NV, AZ, UT, ID, MT
Associated routes: I-115, I-215, I-315, I-515
I-16 166.81 268.45 Macon, Georgia (I-75) Savannah, Georgia (US 17 / GA 404 / Montgomery Street) 1972 current Georgia only
Associated route: I-516
I-17 145.76 234.58 Phoenix, Arizona (I-10) Flagstaff, Arizona (I-40 / AZ-89A) 1961 current Arizona only
Associated routes: none
I-19 63.6 102.4 Nogales, Arizona (MX-15 in Mexico) Tucson, Arizona (I-10) 1972 current Arizona only
Associated routes: none
I-20 1,539.38 2,477.39 Scroggins Draw, Texas (I-10) Florence, South Carolina (I-95) 1957 current 6 states served: TX, LA, MS, AL, GA, SC
Associated routes: I-220, I-520, I-820
I-22 124.70 200.69 Memphis, Tennessee (I-55 / I-40) Birmingham, Alabama (I-65 / US 31) 2012 current 2 states served: Mississippi, Alabama. Planned in 1 more: Tennessee
Planned associated routes: I-222, I-422
I-24 316.36 509.13 Pulley's Mill, Illinois (I-57) Chattanooga, Tennessee (I-75) 1962 current 4 states served: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
I-25 1,062.77 1,710.36 Las Cruces, New Mexico (I-10) Buffalo, Wyoming (I-90 / US 87) 1957 current 3 states served: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26 305.62 491.85 Kingsport, Tennessee (US 11W) Charleston, South Carolina (US 17) 1960 current 3 states served: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
I-27 124.13 199.77 Lubbock, Texas (US 87 / Loop 289) Amarillo, Texas (I-40 / US 87 / US 287) 1969 current Texas only
Associated routes: none
I-29 755.51 1,215.88 Kansas City, Missouri (I-35 / I-70) Pembina, North Dakota (US 81 and PTH 29 in Canada) 1958 current 4 states served: Missouri, Iowa, South Dakota, North Dakota
Associated routes: I-129, I-229
I-30 366.76 590.24 Fort Worth, Texas (I-20) North Little Rock, Arkansas (I-40 / US 65 / US 67 / US 167) 1957 current 2 states served: Texas, Arkansas
Associated routes: I-430, I-530, I-630; Planned: I-130
I-35 1,568.38 2,524.06 Laredo, Texas (US 83 / SH 359 / BS I-35 as well as MX-85 in Mexico) Duluth, Minnesota (MN-61 / LSCT / 26th Avenue) 1956 current 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-37 143.00 230.14 Corpus Christi, Texas (US 181) San Antonio, Texas (I-35 / US 281) 1959 current Texas only
Associated routes: none
I-39 306.14 492.68 Normal, Illinois (I-55) Wausau, Wisconsin (WIS 29 / US-51) 1984 current 2 states served: Illinois, Wisconsin
Associated routes: none
I-40 2,555.10 4,112.03 Barstow, California (I-15) Wilmington, North Carolina (US 117 / NC 132) 1964 current 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-41 176.33 283.78 Russell, Illinois (I-94 / US 41) Howard, Wisconsin (I-43) 2015 current 2 states served:
Illinois, Wisconsin
Associated routes: none
I-43 191.55 308.27 Beloit, Wisconsin (I-39 / I-90) Howard, Wisconsin (US 41 / US 141) 1981 current Wisconsin only
Associated routes: none
I-44 633.79 1,019.99 Wichita Falls, Texas (US 82 / US 277 / US 281 / US 287) St. Louis, Missouri (I-70) 1958 current 3 states served: Texas, Oklahoma, Missouri
Associated routes: I-244, I-444
I-45 284.91 458.52 Galveston, Texas (TX 87) Dallas, Texas (I-30) 1971 current Texas only
Associated route: I-345
I-49 388.25 624.83 New Orleans, Louisiana (I-10 future) Kansas City, Missouri (I-435) 1984 current Unfinished Louisiana-Arkansas section: Blanchard, Louisiana (LA 1) to Texarkana, Arkansas (US 59 / US 71)
3 states served: Louisiana, Arkansas, Missouri
Associated routes: none
I-55 964.25 1,551.81 Laplace, Louisiana (I-10) Chicago, Illinois (US 41, Lake Shore Drive) 1960 current 6 states served: LA, MS, TN, AR, MO, IL
Associated routes: I-155, I-255, I-355; Future: I-555
I-57 386.12 621.40 Miner, Missouri (I-55) Chicago, Illinois (I-94) 1965 current 2 states served: Missouri, Illinois
Associated routes: none
I-59 445.23 716.53 Slidell, Louisiana (I-10 / I-12) Lookout Mountain, Georgia (I-24) 1960 current 4 states served: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
I-64 953.74 1,534.90 Wentzville, Missouri (I-70) Chesapeake, Virginia (I-264 / I-664) 1961 current 6 states served: 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 4 states served: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865
I-66 76.28 122.76 Front Royal, Virginia (I-81) Washington, D.C. (US 29) 1982 current Future states served: Kansas, Missouri, Illinois, Kentucky, West Virginia 2 states served: Virginia, District of Columbia
Associated routes: none
I-68 112.9 181.7 Morgantown, West Virginia (I-79) Hancock, Maryland (I-70) 1991 current 2 states served: West Virginia, Maryland
Associated routes: none
I-69 458.12 737.27 Victoria, Texas (I-69E / US 77 future & I-69W / US 59 future) Port Huron, Michigan (Hwy 402 in Canada) 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: Elberfeld, Indiana (I-64) to Scotland, Indiana (US 231)
6 states served: TX, MS, TN, KY, IN, MI. Planned/started in 2 more: LA, AR
Associated routes: I-69C, I-69E, I-69W, I-369, I-469; Future: I-169, I-269; Planned: I-169 in Tennessee, I-269 in Indiana, I-369 in Kentucky
I-70 2,153.13 3,465.13 Cove Fort, Utah (I-15) Baltimore, Maryland (Park and ride) 1956 current 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-71 343.78 553.26 Louisville, Kentucky (I-64) Cleveland, Ohio (I-90) 1959 current 2 states served: Kentucky, Ohio
Associated routes: I-271, I-471
I-72 179.29 288.54 Hannibal, Missouri (US 61) Champaign, Illinois (I-57) 1970 current 2 states served: Missouri, Illinois
Associated route: I-172
I-73 1,188.3 1,912.4 Briarcliffe Acres, South Carolina (US 17 future) Sault Ste. Marie, Michigan (Canada future) 1997 current 6 states served: MI (future), OH (future), WV (future), VA (future), NC, SC (future)
Associated routes: none
I-74 440.91 709.58 Bettendorf, Iowa (I-80) Garden City, South Carolina (US 17 Bus. future) 1974 current 8 states served: IA, IL, IN, OH, WV (future), VA (future), NC, SC (future)
Associated routes: I-274 (future), I-474
I-75 1,786.47 2,875.04 Hialeah, Florida (SR 826) Sault Ste. Marie, Michigan (Canada) 1958 current 6 states served: FL, GA, TN, KY, OH, MI
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I-76 187.34 301.49 West Denver, Colorado (I-70) Big Springs, Nebraska (I-80) 1975 current 2 states served: Colorado, Nebraska
Associated routes: none
I-76 434.36 699.03 East Westfield Center, Ohio (I-71) Camden, New Jersey (I-295) 1976 current 3 states served: 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 5 states served: 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 3 states served: 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 2 states served: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-80 2,899.54 4,666.36 San Francisco, California (US 101) Fort Lee, New Jersey (I-95) 1956 current 11 states served: 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 6 states served: 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 2 states served: Washington, Oregon
Associated route: I-182
I-83 85.3 137.3 Baltimore, Maryland Harrisburg, Pennsylvania (I-81) 1959 current 2 states served: Maryland, Pennsylvania
Associated route: I-283
I-84 769.62 1,238.58 West Portland, Oregon (I-5) Echo, Utah (I-80) 1980 current 3 states served: Oregon, Idaho, Utah
Associated route: I-184
I-84 232.4 374.0 East Scranton, Pennsylvania (I-81) Sturbridge, Massachusetts (I-90) 1963 current 4 states served: 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 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 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 2 states served: Pennsylvania, New York
Associated routes: none
I-87 333.49 536.70 New York City (I-278) Champlain, New York (A-15 in Canada) 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 in Canada / future A-35) 1960 current 2 states served: New Hampshire, Vermont
Associated route: I-189
I-90 3,101.77 4,991.81 Seattle, Washington (WA 519) Boston, Massachusetts (MA 1A) 1956 current 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-91 290.37 467.31 New Haven, Connecticut/North Haven, Connecticut (I-95) Derby Line, Vermont (A-55 in Canada) 1958 current 3 states served: 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 3 states served: 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 in Canada) 1956 current 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 1,925.74 3,099.18 Miami, Florida (US 1) Houlton, Maine (Route 95 in Canada) 1957 current 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-96 192.06 309.09 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)
2 states served: Pennsylvania, New York
Associated routes: none

Outside of the mainland[edit]

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

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 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:

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)

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. 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. 

External links[edit]