List of Interstate Highways

Dwight D. Eisenhower National System of Interstate and Defense Highways

Highway shield for Interstate 90 and the Eisenhower Interstate System

Primary Interstate Highways in the 48 contiguous states as of 2024

System information
Formed| June 29, 1956[1]
Highway names
Interstates| Interstate X (I-X)
System links

* Interstate Highway System

* Main
* Auxiliary
* Suffixed
* Business
* Future

There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in the west and higher numbers in the east. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.

Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico.

## Contiguous United States

[edit]

There are 71 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highway. This number does not include auxiliary Interstate Highways.

Number  | Length (mi)[2] | Length (km)  | Southern or western terminus  | Northern or eastern terminus  | Formed  | Removed  | Notes

|
|
|
|
|
|
|

I-2 | 46.80 | 75.32  | Bus. US 83 in Peñitas, Texas | I-69E/US 77/US 83 in Harlingen, Texas | 02013-01-012013 | current  | Unfinished in Texas; Texas only
I-4 | 132.30 | 212.92  | I-275 in Tampa, Florida | I-95/SR 400 in Daytona Beach, Florida | 01959-01-011959 | current  | Florida only
I-5 | 1,381.29 | 2,222.97  | Fed. 1/Fed. 1D at Mexican border in San Ysidro, California | Hwy 99 at Canadian border in Blaine, Washington | 01956-01-011956 | current  | Serves three states: California, Oregon, Washington
Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California
I-8 | 350.34 | 563.82  | Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, California | I-10 in Casa Grande, Arizona | 01964-01-011964 | current  | Serves two states: California, Arizona
I-10 | 2,460.34 | 3,959.53  | SR 1 in Santa Monica, California | I-95/US 17/SR 15/SR 228 in Jacksonville, Florida | 01957-01-011957 | 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 | 54.193 | 87.215  | US 93 at the Arizona state line near Boulder City, Nevada | US 95/SR 157 in Las Vegas, Nevada | 02017-01-012017 | current  | Unfinished in Nevada; Nevada only; planned in one more: Arizona
I-12 | 85.59 | 137.74  | I-10 in Baton Rouge, Louisiana | I-10/I-59 in Slidell, Louisiana | 01967-01-011967 | current  | Louisiana only
I-14 | 25.10 | 40.39  | US 190/US 190 Bus in Copperas Cove, Texas | I-35/US 190 in Belton, Texas | 02017-01-262017 | current  | Unfinished in Texas; Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia
Planned associated routes: I-14N, I-14S, and I-214 in Texas
I-15 | 1,433.52 | 2,307.03  | I-8/SR 15 in San Diego, California | Highway 4 at Canadian border in Sweetgrass, Montana | 01957-01-011957 | current  | Unfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana
Associated routes: I-115, I-215, I-315
I-16 | 166.81 | 268.45  | I-75/SR 540 in Macon, Georgia | Montgomery Street in Savannah, Georgia | 01966-01-011966 | current  | Georgia only
Associated route: I-516
I-17 | 145.93 | 234.85  | I-10/US 60 in Phoenix, Arizona | I-40/SR 89A in Flagstaff, Arizona | 01961-01-011961 | current  | Arizona only
I-19 | 63.43 | 102.08  | I-19 Bus. in Nogales, Arizona | I-10 in Tucson, Arizona | 01972-01-011972 | current  | Arizona only
Uses kilometers instead of miles
I-20 | 1,539.38 | 2,477.39  | I-10 in Reeves County, Texas | I-95/I-20 Bus. in Florence, South Carolina | 01957-01-011957 | 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/MS 304 near Byhalia, Mississippi | I-65 in Birmingham, Alabama | 02012-01-012012 | current  | Unfinished in Alabama; serves two states: Mississippi, Alabama
Planned associated routes: I-222 and I-422 in Alabama
I-24 | 316.36 | 509.13  | I-57 in Pulley's Mill, Illinois | I-75 in Chattanooga, Tennessee | 01962-01-011962 | 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 | 01957-01-011957 | current  | Serves three states: New Mexico, Colorado, Wyoming
Associated route: I-225
I-26 | 328.09 | 528.01  | US 11W/US 23/SR 137 in Kingsport, Tennessee | US 17 in Charleston, South Carolina | 01960-01-011960 | current  | Unfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
I-27 | 128.332 | 206.530  | US 87 in Lubbock, Texas | I-40/US 87/US 287/US 60 in Amarillo, Texas | 01969-01-011969 | current  | Unfinished in Texas; Texas only; planned in one more: New Mexico; Planned associated routes in Texas: I-27E, I-27W, I-27N[3]
I-29 | 750.58 | 1,207.94  | I-35/I-70/US 24/US 40/US 71 in Kansas City, Missouri | US 81 and PTH 75 at Canadian border in Pembina, North Dakota | 01958-01-011958 | 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 | 01957-01-011957 | current  | Serves two states: Texas, Arkansas
Associated routes: I-430, I-530, I-630
I-31 | — | —  | I-94 in Fargo, North Dakota | US 81 and PTH 75 at Canadian border in Pembina, North Dakota | 01957-01-011957 | 01958-01-011958  | Served North Dakota only
Replaced by a northward extension of I-29
I-35 | 1,569.06 | 2,525.16  | US 83/Victoria Street in Laredo, Texas | MN 61/LSCT/26th Avenue in Duluth, Minnesota | 01956-01-011956 | 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 | 01959-01-011959 | current  | Texas only
I-39 | 306.14 | 492.68  | I-55 in Normal, Illinois | WIS 29/US 51 in Wausau, Wisconsin | 01984-01-011984 | current  | Serves two states: Illinois, Wisconsin
I-40 | 2,556.61 | 4,114.46  | I-15 in Barstow, California | US 117/NC 132 in Wilmington, North Carolina | 01957-01-011957 | 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/US 41/US 141 in Howard, Wisconsin | 02015-01-012015 | current  | Serves two states: Illinois, Wisconsin
I-42 | 190 | 310  | I-35 in Noble County, Oklahoma | I-49 in Springdale, Arkansas | proposed | —  | Future Interstate; will serve two states: Oklahoma, Arkansas
I-42 | 31.5 | 50.7  | I-40/US 70 in Garner, North Carolina | US 70 in Goldsboro, North Carolina | 02024-01-012024 | current  | Unfinished in North Carolina; North Carolina only
I-43 | 191.55 | 308.27  | I-39/I-90 in Beloit, Wisconsin | I-41/US 41/US 141 in Howard, Wisconsin | 01981-01-011981 | current  | Wisconsin only
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 | 01958-01-011958 | current  | Serves three states: Texas, Oklahoma, Missouri
Associated routes: I-244, I-344, I-444
I-45 | 284.91 | 458.52  | SH 87 in Galveston, Texas | I-30/US 67/US 75 in Dallas, Texas | 01971-01-011971 | current  | Texas only
Associated route: I-345
I-49 | 547.52 | 881.15  | I-10/US 167/LA 182 in Lafayette, Louisiana | I-435/I-470/US 50/US 71 in Kansas City, Missouri | 01984-01-011984 | current  | Unfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas
I-55 | 964.25 | 1,551.81  | I-10 in LaPlace, Louisiana | US 41 in Chicago, Illinois | 01960-01-011960 | current  | Serves six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Associated routes: I-155, I-255, I-355, I-555
I-57 | 508.92 | 819.03  | I-40 in North Little Rock, Arkansas | I-94 in Chicago, Illinois | 01965-01-011965 | current  | Unfinished in Missouri and Arkansas; serves three states: Arkansas, Missouri, Illinois.
I-59 | 445.23 | 716.53  | I-10/I-12 in Slidell, Louisiana | I-24 in Wildwood, Georgia | 01960-01-011960 | 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 | 01961-01-011961 | 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 | 01958-01-011958 | current  | Serves four states: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky
I-66 | — | —  | Wichita, Kansas | Near Pikeville, Kentucky | 01991-01-011991 | 02015-01-012015[4] | Served four states: Kansas, Missouri, Illinois, Kentucky
Associated routes: I-66 Spur in Kentucky
The project was unpopular and ultimately cancelled without the interstate being completed; I-66 Spur eventually became I-165
I-66 | 76.28 | 122.76  | I-81 in Front Royal, Virginia | US 29 in Washington, D.C. | 01961-01-011961 | current  | Serves DC and one state: Virginia
I-68 | 113.15 | 182.10  | I-79 in Morgantown, West Virginia | I-70 in Hancock, Maryland | 01991-01-011991 | current  | Serves two states: West Virginia, Maryland
I-69 | 910.10 | 1,464.66  | US 59 in Rosenberg, Texas

* * *

MS 713 near Banks, Mississippi

* * *

US 51 in Fulton, Kentucky

* * *

US 41 in Evansville, Indiana | US 59 in Splendora, Texas

* * *

US 51 in Memphis, Tennessee

* * *

US 41 in Henderson, Kentucky

* * *

Highway 402 at Canadian border in Port Huron, Michigan | 01957-01-011957 | current  |

* Unfinished in Texas, Mississippi, Kentucky, and Indiana; serves five states: Texas, Mississippi, Kentucky, Indiana, Michigan
* Planned/started in 3 more: Louisiana, Arkansas, Tennessee
* Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-569 in Kentucky

I-70 | 2,171.71 | 3,495.03  | I-15 in Cove Fort, Utah | I-695 in Woodlawn, Maryland | 01956-01-011956 | 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 | 01959-01-011959 | 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 | 01970-01-011970 | current  | Serves two states: Missouri, Illinois
Associated route: I-172
I-73 | 101.10 | 162.70  | US 220 near Stokesdale, North Carolina | I‑74 and US 74 in Hamlet, North Carolina | 01997-01-011997 | current  | Unfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan
I-74 | 541.62 | 871.65  | I-80 in Bettendorf, Iowa | US 74/NC 41 near Lumberton, North Carolina | 01974-01-011974 | current  | Unfinished in Ohio and North Carolina; serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina
Associated routes: I-474; Planned: I-274 in North Carolina
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 | 01958-01-011958 | 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 | 187.29 | 301.41  | I-70 at Denver, Colorado | I-80 at Big Springs, Nebraska | 01975-01-011975 | current  | Serves two states: Colorado, Nebraska
I-76 | 435.66 | 701.13  | I-71 in Westfield Center, Ohio | I-295 at Bellmawr, New Jersey | 01964-01-011964 | current  | Serves three states: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676
I-77 | 610.10 | 981.86  | I-26 in Columbia, South Carolina | I-90 in Cleveland, Ohio | 01958-01-011958 | 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, New York | 01957-01-011957 | 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 | 01967-01-011967 | current  | Serves two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579
I-80 | 2,900.76 | 4,668.32  | US 101 in San Francisco, California | I-95 in Teaneck, New Jersey | 01956-01-011956 | 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 | Hwy 137 at Canadian border on Wellesley Island, New York | 01961-01-011961 | 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 | 01957-01-011957 | current  | Serves two states: Washington, Oregon
Associated route: I-182
I-82 | — | —  | I-81/I-84/US 6 in Scranton, Pennsylvania | I-95 in Teaneck, New Jersey | 01957-01-011957 | 01958-01-011958  | Served two states: Pennsylvania, New Jersey
Was the initial designation to what is now I-380 and I-80
I-82 | — | —  | I-84 in East Hartford, Connecticut | Providence, Rhode Island | 01956-01-011956 | 01968-01-011968  | Served one state: Connecticut, was planned for one state: Rhode Island
Redesignated as I-84 in 1968
I-83 | 85.03 | 136.84  | President Street and Fayette Street in Baltimore, Maryland | I-81 in Harrisburg, Pennsylvania | 01959-01-011959 | 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 | 01980-01-011980 | 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 | 01963-01-011963 | 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 | 01958-01-011958 | current  | Unfinished in Alabama; 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-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina
I-86 | 62.85 | 101.15  | I-84 near Declo, Idaho | I-15 in Chubbuck, Idaho | 01980-01-011980 | current  | Idaho only
I-86 | 254.02 | 408.81  | I-90 near North East, Pennsylvania | NY 17/NY 79 in Windsor, New York | 01999-01-011999 | current  | Unfinished in New York; serves two states: Pennsylvania, New York
I-86 | 38.97 | 62.72  | I-84 in East Hartford, Connecticut | I-90 in Sturbridge, Massachusetts | 01968-01-011968 | 01984-01-011984  | Served two states: Connecticut, Massachusetts
Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled
I-87 | 12.90 | 20.76  | I-40/I-440/US 64/US 264 in Raleigh, North Carolina | US 64/US 264 in Wendell, North Carolina | 02017-01-012017 | current  | Unfinished in North Carolina; North Carolina only; planned in one more: Virginia
Associated route: I-587
I-87 | 333.49 | 536.70  | I-278 in New York City, New York | A-15 at Canadian border in Champlain, New York | 01957-01-011957 | current  | New York only
Associated routes: I-287, I-587, I-787
I-88 | 140.60 | 226.27  | I-80/IL 92 in East Moline, Illinois | I-290/IL 110 in Hillside, Illinois | 01987-01-011987 | current  | Illinois only
I-88 | 117.75 | 189.50  | I-81 in Binghamton, New York | I-90 in Schenectady, New York | 01968-01-011968 | current  | New York only
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 | 01960-01-011960 | current  | Serves two states: New Hampshire, Vermont
Associated route: I-189
I-90 | 3,099.74 | 4,988.55  | SR 519/4th Avenue/Edgar Martinez Drive in Seattle, Washington | MA 1A in Boston, Massachusetts | 01956-01-011956 | 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/Route 34 in New Haven, Connecticut | A-55 at Canadian border in Derby Line, Vermont | 01958-01-011958 | 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 | 01957-01-011957 | current  | Serves three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
I-94 | 1,555.43 | 2,503.22  | I-90 in Lockwood, Montana | Highway 402 at Canadian border in Port Huron, Michigan | 01956-01-011956 | 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 | 1,905.96 | 3,067.35  | US 1 in Miami, Florida | NB 95 at Canadian border in Houlton, Maine | 01957-01-011957 | 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 primary north-south Interstate highway
I-96 | 192.032 | 309.046  | US 31 in Norton Shores, Michigan | I-75 in Detroit, Michigan | 01959-01-011959 | current  | Michigan only
Associated routes: I-196, I-296, I-496, I-696
I-97 | 17.62 | 28.36  | US 50/US 301 in Annapolis, Maryland | I-695/I-895A in Glen Burnie, Maryland | 01987-01-011987 | current  | Maryland only
I-99 | 161.68 | 260.20  | US 220 in Bedford, Pennsylvania | I-86/NY 17 in Painted Post, New York | 01998-01-011998 | current  | Unfinished in Pennsylvania; serves two states: Pennsylvania, New York

* Former
* Proposed and unbuilt

## Other regions

[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:

> 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.[5]

### Hawaii

[edit]

Map of Hawaii's Interstate Highways (excluding H-201)

The Interstate Highways on 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 | 01960-01-011960 | current  | Associated route: H-201
H-2 | 8.33 | 13.41  | H-1 in Pearl City | Route 99 in Wahiawa | 01960-01-011960 | current  |
H-3 | 15.32 | 24.66  | H-1/H-201 in Halawa | Marine Corps Base Hawaii | 01997-01-011997 | current  |

### Alaska

[edit]

Main article: List of Interstate Highways in Alaska

Map of Alaska's Interstate Highways

Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers.[6]

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 | 01976-01-011976 | current  | Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway[7][8][9][10]
A-2 | 202.18 | 325.38  | Tok | Fairbanks | 01976-01-011976 | current  | Alaska Highway, Richardson Highway[8][9][10]
A-3 | 148.12 | 238.38  | Anchorage | Soldotna | 01976-01-011976 | current  | Seward Highway, Sterling Highway[7][9][10]
A-4 | 323.69 | 520.93  | Gateway, near Palmer | Fairbanks | 01976-01-011976 | current  | Parks Highway[7][8][9][10]

### Puerto Rico

[edit]

Main article: List of highways in Puerto Rico § Interstates

Map of the Interstates in Puerto Rico

Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.[11]

Number  | Length (mi)[2] | Length (km)  | Southern or western terminus  | Northern or eastern terminus  | Formed  | Removed  | Notes

|
|
|
|
|
|
|

PR-1 | 71.08 | 114.39  | PR-2 in Ponce | PR-2 in San Juan | 01976-01-011976 | current  | Follows PR-52
PR-2 | 138.13 | 222.30  | PR-1 in Ponce | PR-3 in San Juan | 01976-01-011976 | current  | Follows PR-22
PR-3 | 40.56 | 65.27  | PR-3 in Humacao | PR-2 in San Juan | 01976-01-011976 | current  | Follows PR-66

## See also

[edit]

* U.S. Roads portal
* List of United States Numbered Highways

## References

[edit]

1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Archived from the original on September 23, 2021. 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. ^ United States Congress (March 22, 2024). "Text - S.992 - 118th Congress (2023-2024): I-27 Numbering Act of 2023". Congress.gov. Library of Congress. Retrieved February 21, 2025.
4. ^ Nelsen, Carrie (July 9, 2015). "For Immediate Release" (PDF) (Press release). Illinois Department of Transportation. Archived from the original (PDF) on September 6, 2015.
5. ^ Staff. "FHWA Route Log and Finder List". Federal Highway Administration. Retrieved May 24, 2007.
6. ^ Voss, Oscar. "Alaska Roads: Interstate ends photos". Retrieved May 24, 2007.
7. ^ 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.
8. ^ 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.
9. ^ a b c d Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
10. ^ 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. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
11. ^ Voss, Oscar. "Puerto Rico road photos". Retrieved May 24, 2007.

## External links

[edit]

* Geographic data related to List of Interstate Highways at OpenStreetMap
* Alaska Roads - Interstate ends photos
* Puerto Rico road photos
* The Dwight D. Eisenhower National System of Interstate and Defense Highways Route Log and Finder List
* 3-digit Interstate Highways

* v
* t
* e

Primary Interstate Highways

Signed|

* 2
* 4
* 5
* 8
* 10
* 11
* 12
* 14
* 15
* 16
* 17
* 19
* 20
* 22
* 24
* 25
* 26
* 27
* 29
* 30
* 31
* 35
* 37
* 39
* 40
* 41
* 42
* 43
* 44
* 45
* 49
* 55
* 57
* 59
* 64
* 65
* 66
* KS–KY
* VA–DC
* 68
* 69
* 70
* 71
* 72
* 73
* 74
* 75
* 76
* CO–NE
* OH–NJ
* 77
* 78
* 79
* 80
* 81
* 82
* WA–OR
* PA–NY
* CT–RI
* 83
* 84
* OR–UT
* PA–MA
* 85
* 86
* ID
* PA–NY
* CT–MA
* 87
* NC
* NY
* 88
* IL
* NY
* 89
* 90
* 91
* 93
* 94
* 95
* 96
* 97
* 99
* H-1
* H-2
* H-3

Unsigned|

* A-1
* A-2
* A-3
* A-4
* PRI-1
* PRI-2
* PRI-3

Lists|

* Primary
* Auxiliary
* Suffixed
* Business
* Future

Other|

* Standards
* Gaps
* Tolled

Routes in italics are no longer a part of the system. Major Interstates are highlighted.
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template