List of Interstate Highways

{{infobox state highway system

| title = Dwight D. Eisenhower National System of Interstate and Defense Highways

| shields = {{infobox road/shieldmain/USA|type=I|route=90}}File:MUTCD M1-10.svg

| caption = Highway shield for Interstate 90 and the Eisenhower Interstate System

| map = {{Maplink|frame=yes|plain=yes|frame-align=center|frame-width=330|frame-height=240|zoom=3|frame-lat=38|frame-long=-96|type=line|from=Interstate 2.map|type2=line|from2=Interstate 4.map|type3=line|from3=Interstate 5.map|type4=line|from4=Interstate 8.map|type5=line|from5=Interstate 10.map|type6=line|from6=Interstate 11.map|type7=line|from7=Interstate 12.map|type8=line|from8=Interstate 14.map|type9=line|from9=Interstate 15.map|type10=line|from10=Interstate 16.map|type11=line|from11=Interstate 17.map|type12=line|from12=Interstate 19.map|type13=line|from13=Interstate 20.map|type14=line|from14=Interstate 22.map|type15=line|from15=Interstate 24.map|type73=line|from73=Interstate 25.map|type16=line|from16=Interstate 26.map|type17=line|from17=Interstate 27.map|type18=line|from18=Interstate 29.map|type19=line|from19=Interstate 30.map|type20=line|from20=Interstate 35.map|type21=line|from21=Interstate 37.map|type22=line|from22=Interstate 39.map|type23=line|from23=Interstate 40.map|type24=line|from24=Interstate 41.map|type25=line|from25=Interstate 42 1.map|type26=line|from26=Interstate 43.map|type27=line|from27=Interstate 44.map|type28=line|from28=Interstate 45.map|type29=line|from29=Interstate 49 1.map|type30=line|from30=Interstate 55.map|type31=line|from31=Interstate 57.map|type32=line|from32=Interstate 59.map|type33=line|from33=Interstate 64.map|type34=line|from34=Interstate 65.map|type35=line|from35=Interstate 66.map|type36=line|from36=Interstate 68.map|type37=line|from37=Interstate 69.map|type38=line|from38=Interstate 70.map|type39=line|from39=Interstate 71.map|type40=line|from40=Interstate 72.map|type41=line|from41=Interstate 73.map|type42=line|from42=Interstate 74.map|type43=line|from43=Interstate 75.map|type44=line|from44=Interstate 76 (Ohio–New Jersey).map|type45=line|from45=Interstate 76 (Colorado–Nebraska).map|type46=line|from46=Interstate 77.map|type47=line|from47=Interstate 78.map|type48=line|from48=Interstate 79.map|type49=line|from49=Interstate 80.map|type50=line|from50=Interstate 81.map|type51=line|from51=Interstate 82.map|type52=line|from52=Interstate 83.map|type53=line|from53=Interstate 84 (Oregon–Utah).map|type54=line|from54=Interstate 84 (Pennsylvania–Massachusetts).map|type55=line|from55=Interstate 85.map|type56=line|from56=Interstate 86 (Idaho).map|type57=line|from57=Interstate 86 (Pennsylvania–New York).map|type58=line|from58=Interstate 87 (North Carolina) 1.map|type59=line|from59=Interstate 87 (New York).map|type60=line|from60=Interstate 88 (Illinois).map|type61=line|from61=Interstate 88 (New York).map|type62=line|from62=Interstate 89.map|type63=line|from63=Interstate 90.map|type64=line|from64=Interstate 91.map|type65=line|from65=Interstate 93.map|type66=line|from66=Interstate 94.map|type67=line|from67=Interstate 95.map|type68=line|from68=Interstate 96.map|type69=line|from69=Interstate 97.map|type70=line|from70=Interstate 99.map|type71=line|from71=Interstate 35W (Texas).map|type72=line|from72=Interstate 35W (Minnesota).map}}

| map_custom = yes

| map_notes = Primary Interstate Highways in the 48 contiguous states as of 2024

| formed = June 29, 1956{{cite journal |last= Weingroff |first= Richard F. |title=Federal-Aid Highway Act of 1956, Creating the Interstate System |url= https://highways.dot.gov/public-roads/summer-1996/federal-aid-highway-act-1956-creating-interstate-system |journal= Public Roads |location= Washington, DC |publisher= Federal Highway Administration |volume=60 |issue= 1 |date=Summer 1996 |access-date= March 16, 2012}}

| length_mi =

| length_ref =

| interstate = Interstate X (I-X)

|links = BL

}}

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

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.

{{routelist top|length_ref={{cite web |title=Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018 |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table01.cfm |website=FHWA Route Log and Finder List |publisher=Federal Highway Administration |access-date=April 21, 2021 |date=May 6, 2019}}}}

{{routelist row

| country = USA

| type = I

| route = 2

| length_mi = 46.80

| terminus_a = Bus. US 83 in Peñitas, Texas

| terminus_b = I-69E/US 77/US 83 in Harlingen, Texas

| established = 2013

| notes = Unfinished in Texas; Texas only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 4

| length_mi = 132.30

| terminus_a = I-275 in Tampa, Florida

| terminus_b = I-95/SR 400 in Daytona Beach, Florida

| established = 1959

| notes = Florida only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 5

| length_mi = 1,381.29

| terminus_a = Fed. 1/Fed. 1D at Mexican border in San Ysidro, California

| terminus_b = Hwy 99 at Canadian border in Blaine, Washington

| established = 1956

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 8

| length_mi = 350.34

| terminus_a = Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, California

| terminus_b = I-10 in Casa Grande, Arizona

| established = 1964

| notes = Serves two states: California, Arizona

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 10

| length_mi = 2,460.34

| terminus_a = SR 1 in Santa Monica, California

| terminus_b = I-95/US 17/SR 15/SR 228 in Jacksonville, Florida

| established = 1957

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 11

| length_mi = 54.193

| terminus_a = US 93 at the Arizona state line near Boulder City, Nevada

| terminus_b = US 95/SR 157 in Las Vegas, Nevada

| established = 2017

| notes = Unfinished in Nevada; Nevada only; planned in one more: Arizona

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 12

| length_mi = 85.59

| terminus_a = I-10 in Baton Rouge, Louisiana

| terminus_b = I-10/I-59 in Slidell, Louisiana

| established = 1967

| notes = Louisiana only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 14

| length_mi = 25.10

| terminus_a = US 190/US 190 Bus in Copperas Cove, Texas

| terminus_b = I-35/US 190 in Belton, Texas

| established = January 26, 2017

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 15

| length_mi = 1,433.52

| terminus_a = I-8/SR 15 in San Diego, California

| terminus_b = Highway 4 at Canadian border in Sweetgrass, Montana

| established = 1957

| notes = Unfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana
Associated routes: I-115, I-215, I-315

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 16

| length_mi = 166.81

| terminus_a = I-75/SR 540 in Macon, Georgia

| terminus_b = Montgomery Street in Savannah, Georgia

| established = 1966

| notes = Georgia only
Associated route: I-516

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 17

| length_mi = 145.93

| terminus_a = I-10/US 60 in Phoenix, Arizona

| terminus_b = I-40/SR 89A in Flagstaff, Arizona

| established = 1961

| notes = Arizona only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 19

| length_mi = 63.43

| terminus_a = I-19 Bus. in Nogales, Arizona

| terminus_b = I-10 in Tucson, Arizona

| established = 1972

| notes = Arizona only
Uses kilometers instead of miles

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 20

| length_mi = 1,539.38

| terminus_a = I-10 in Reeves County, Texas

| terminus_b = I-95/I-20 Bus. in Florence, South Carolina

| established = 1957

| notes = Serves six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina
Associated routes: I-220, I-520, I-820

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 22

| length_mi = 202.22

| terminus_a = I-269/US 78/MS 304 near Byhalia, Mississippi

| terminus_b = I-65 in Birmingham, Alabama

| established = 2012

| notes = Unfinished in Alabama; serves two states: Mississippi, Alabama
Planned associated routes: I-222 and I-422 in Alabama

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 24

| length_mi = 316.36

| terminus_a = I-57 in Pulley's Mill, Illinois

| terminus_b = I-75 in Chattanooga, Tennessee

| established = 1962

| notes = Serves four states: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 25

| length_mi = 1,061.67

| terminus_a = I-10/US 85/US 180 in Las Cruces, New Mexico

| terminus_b = I-90/US 87 in Buffalo, Wyoming

| established = 1957

| notes = Serves three states: New Mexico, Colorado, Wyoming
Associated route: I-225

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 26

| length_mi = 328.09

| terminus_a = US 11W/US 23/SR 137 in Kingsport, Tennessee

| terminus_b = US 17 in Charleston, South Carolina

| established = 1960

| notes = Unfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 27

| length_mi = 128.332

| terminus_a = US 87 in Lubbock, Texas

| terminus_b = I-40/US 87/US 287/US 60 in Amarillo, Texas

| established = 1969

| notes = Unfinished in Texas; Texas only; planned in one more: New Mexico; Planned associated routes in Texas: I-27E, I-27W, I-27N{{cite web |last1=United States Congress |title=Text - S.992 - 118th Congress (2023-2024): I-27 Numbering Act of 2023 |url=https://www.congress.gov/bill/118th-congress/senate-bill/992/text |website=Congress.gov |date=March 22, 2024 |publisher=Library of Congress |access-date=21 February 2025}}

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 29

| length_mi = 750.58

| terminus_a = I-35/I-70/US 24/US 40/US 71 in Kansas City, Missouri

| terminus_b = US 81 and PTH 75 at Canadian border in Pembina, North Dakota

| established = 1958

| notes = Serves four states: Missouri, Iowa, South Dakota, North Dakota
Associated routes: I-129, I-229

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 30

| length_mi = 366.76

| terminus_a = I-20 in Fort Worth, Texas

| terminus_b = I-40/US 65/US 67/US 167 in North Little Rock, Arkansas

| established = 1957

| notes = Serves two states: Texas, Arkansas
Associated routes: I-430, I-530, I-630

| state =

}}

{{routelist row

| country=USA

| type = I

| route = 31

| length_mi=

| terminus_a = I-94 in Fargo, North Dakota

| terminus_b = US 81 and PTH 75 at Canadian border in Pembina, North Dakota

| established= 1957

| established_ref=

| circa_established=

| decommissioned= 1958

| decommissioned_ref=

| notes= Served North Dakota only
Replaced by a northward extension of I-29

}}

{{routelist row

| country = USA

| type = I

| route = 35

| length_mi = 1,569.06

| terminus_a = US 83/Victoria Street in Laredo, Texas

| terminus_b = MN 61/LSCT/26th Avenue in Duluth, Minnesota

| established = 1956

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 37

| length_mi = 143.00

| terminus_a = US 181 in Corpus Christi, Texas

| terminus_b = I-35/US 281 in San Antonio, Texas

| established = 1959

| notes = Texas only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 39

| length_mi = 306.14

| terminus_a = I-55 in Normal, Illinois

| terminus_b = WIS 29/US 51 in Wausau, Wisconsin

| established = 1984

| notes = Serves two states: Illinois, Wisconsin

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 40

| length_mi = 2,556.61

| terminus_a = I-15 in Barstow, California

| terminus_b = US 117/NC 132 in Wilmington, North Carolina

| established = 1957

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 41

| length_mi = 175.00

| terminus_a = I-94/US 41 in Russell, Illinois

| terminus_b = I-43/US 41/US 141 in Howard, Wisconsin

| established = 2015

| notes = Serves two states: Illinois, Wisconsin

| state =

}}

{{routelist row

| country=USA

| type = I

| route = 42

| dab = Oklahoma–Arkansas

| length_mi= 190

| terminus_a = I-35 in Noble County, Oklahoma

| terminus_b = I-49 in Springdale, Arkansas

| established = proposed

| notes= Future Interstate; will serve two states: Oklahoma, Arkansas

}}

{{routelist row

| country = USA

| type = I

| route = 42

| dab = North Carolina

| length_mi = 31.5

| terminus_a = I-40/US 70 in Garner, North Carolina

| terminus_b = US 70 in Goldsboro, North Carolina

| established = 2024

| notes = Unfinished in North Carolina; North Carolina only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 43

| length_mi = 191.55

| terminus_a = I-39/I-90 in Beloit, Wisconsin

| terminus_b = I-41/US 41/US 141 in Howard, Wisconsin

| established = 1981

| notes = Wisconsin only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 44

| length_mi = 636.69

| terminus_a = US 82/US 277/US 281/US 287 in Wichita Falls, Texas

| terminus_b = I-70 in St. Louis, Missouri

| established = 1958

| notes = Serves three states: Texas, Oklahoma, Missouri
Associated routes: I-244, I-344, I-444

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 45

| length_mi = 284.91

| terminus_a = SH 87 in Galveston, Texas

| terminus_b = I-30/US 67/US 75 in Dallas, Texas

| established = 1971

| notes = Texas only
Associated route: I-345

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 49

| length_mi = 547.52

| terminus_a = I-10/US 167/LA 182 in Lafayette, Louisiana

| terminus_b = I-435/I-470/US 50/US 71 in Kansas City, Missouri

| established = 1984

| notes = Unfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 55

| length_mi = 964.25

| terminus_a = I-10 in LaPlace, Louisiana

| terminus_b = US 41 in Chicago, Illinois

| established = 1960

| notes = Serves six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois
Associated routes: I-155, I-255, I-355, I-555

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 57

| length_mi = 508.92

| terminus_a = I-40 in North Little Rock, Arkansas

| terminus_b = I-94 in Chicago, Illinois

| established = 1965

| notes = Unfinished in Missouri and Arkansas; serves three states: Arkansas, Missouri, Illinois.

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 59

| length_mi = 445.23

| terminus_a = I-10/I-12 in Slidell, Louisiana

| terminus_b = I-24 in Wildwood, Georgia

| established = 1960

| notes = Serves four states: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 64

| length_mi = 963.52

| terminus_a = I-70/US 61 in Wentzville, Missouri

| terminus_b = I-264/I-664 in Chesapeake, Virginia

| established = 1961

| notes = Serves six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia
Associated routes: I-264, I-464, I-564, I-664

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 65

| length_mi = 887.30

| terminus_a = I-10 in Mobile, Alabama

| terminus_b = US 12/US 20 in Gary, Indiana

| established = 1958

| notes = Serves four states: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky

| state =

}}

{{routelist row

| country=USA

| type = I

| route = 66

| dab = Kansas–Kentucky

| length_mi=

| terminus_a = Wichita, Kansas

| terminus_b = Near Pikeville, Kentucky

| established= 1991

| established_ref=

| circa_established=

| decommissioned= 2015

| decommissioned_ref={{Cite press release |first= Carrie |last= Nelsen |title= For Immediate Release |url= http://www.66corridor.org/doclib/docs%5C2015-07-09PressRelease.pdf |archive-url= https://web.archive.org/web/20150906094950/http://www.66corridor.org/doclib/docs%5C2015-07-09PressRelease.pdf |url-status= dead |archive-date= September 6, 2015 |publisher= Illinois Department of Transportation |date= July 9, 2015 }}

| notes= 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

}}

{{routelist row

| country = USA

| type = I

| route = 66

| length_mi = 76.28

| terminus_a = I-81 in Front Royal, Virginia

| terminus_b = US 29 in Washington, D.C.

| established = 1961

| notes = Serves DC and one state: Virginia

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 68

| length_mi = 113.15

| terminus_a = I-79 in Morgantown, West Virginia

| terminus_b = I-70 in Hancock, Maryland

| established = 1991

| notes = Serves two states: West Virginia, Maryland

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 69

| length_mi = 910.10

| terminus_a = US 59 in Rosenberg, Texas

| terminus_b = Highway 402 at Canadian border in Port Huron, Michigan

| established = 1957

| notes = Unfinished in Texas, Mississippi, Kentucky, and Indiana; serves six 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 70

| length_mi = 2,171.71

| terminus_a = I-15 in Cove Fort, Utah

| terminus_b = I-695 in Woodlawn, Maryland

| established = 1956

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 71

| length_mi = 345.57

| terminus_a = I-64 in Louisville, Kentucky

| terminus_b = I-90 in Cleveland, Ohio

| established = 1959

| notes = Serves two states: Kentucky, Ohio
Associated routes: I-271, I-471

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 72

| length_mi = 179.29

| terminus_a = US 61 in Hannibal, Missouri

| terminus_b = Church Street and University Avenue in Champaign, Illinois

| established = 1970

| notes = Serves two states: Missouri, Illinois
Associated route: I-172

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 73

| length_mi = 101.10

| terminus_a = US 220 near Stokesdale, North Carolina

| terminus_b = I‑74 and US 74 in Hamlet, North Carolina

| established = 1997

| notes = Unfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 74

| length_mi = 541.62

| terminus_a = I-80 in Bettendorf, Iowa

| terminus_b = US 74/NC 41 near Lumberton, North Carolina

| established = 1974

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 75

| length_mi = 1,786.47

| terminus_a = SR 826/SR 916/SR 924 in Miami Lakes, Florida

| terminus_b = Canadian border at Sault Ste. Marie, Michigan

| established = 1958

| notes = Serves six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 76

| dab = Colorado–Nebraska

| length_mi = 187.29

| terminus_a = I-70 at Denver, Colorado

| terminus_b = I-80 at Big Springs, Nebraska

| established = 1975

| notes = Serves two states: Colorado, Nebraska

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 76

| dab = Ohio–New Jersey

| length_mi = 435.66

| terminus_a = I-71 in Westfield Center, Ohio

| terminus_b = I-295 at Bellmawr, New Jersey

| established = 1964

| notes = Serves three states: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 77

| length_mi = 610.10

| terminus_a = I-26 in Columbia, South Carolina

| terminus_b = I-90 in Cleveland, Ohio

| established = 1958

| notes = Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated route: I-277

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 78

| length_mi = 146.28

| terminus_a = I-81 at Jonestown, Pennsylvania

| terminus_b = Canal Street in New York City

| established = 1957

| notes = Serves three states: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478, I-678, I-878

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 79

| length_mi = 343.46

| terminus_a = I-77 in Charleston, West Virginia

| terminus_b = PA 5 in Erie, Pennsylvania

| established = 1967

| notes = Serves two states: West Virginia, Pennsylvania
Associated routes: I-279, I-579

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 80

| length_mi = 2,900.76

| terminus_a = US 101 in San Francisco, California

| terminus_b = I-95 in Teaneck, New Jersey

| established = 1956

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 81

| length_mi = 855.02

| terminus_a = I-40 in Dandridge, Tennessee

| terminus_b = Hwy 137 at Canadian border on Wellesley Island, New York

| established = 1961

| notes = Serves six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York
Associated routes: I-381, I-481, I-581, I-781

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 82

| length_mi = 143.58

| terminus_a = I-90 in Ellensburg, Washington

| terminus_b = I-84 in Hermiston, Oregon

| established = 1957

| notes = Serves two states: Washington, Oregon
Associated route: I-182

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 82

| dab = Pennsylvania–New York

| length_mi =

| terminus_a = I-81/I-84/US 6 in Scranton, Pennsylvania

| terminus_b = I-95 in Teaneck, New Jersey

| established = 1957

| established_ref =

| circa_established =

| decommissioned = 1958

| decommissioned_ref =

| notes = Served two states: Pennsylvania, New Jersey
Was the initial designation to what is now I-380 and I-80

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 82

| dab = Connecticut–Rhode Island

| length_mi =

| terminus_a = I-84 in East Hartford, Connecticut

| terminus_b = Providence, Rhode Island

| established = 1956

| established_ref =

| circa_established =

| decommissioned = 1968

| decommissioned_ref =

| notes = Served one state: Connecticut, was planned for one state: Rhode Island
Redesignated as I-84 in 1968

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 83

| length_mi = 85.03

| terminus_a = President Street and Fayette Street in Baltimore, Maryland

| terminus_b = I-81 in Harrisburg, Pennsylvania

| established = 1959

| notes = Serves two states: Maryland, Pennsylvania
Associated route: I-283

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 84

| dab = Oregon–Utah

| length_mi = 769.62

| terminus_a = I-5 in Portland, Oregon

| terminus_b = I-80 in Echo, Utah

| established = 1980

| notes = Serves three states: Oregon, Idaho, Utah
Associated route: I-184

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 84

| dab = Pennsylvania–Massachusetts

| length_mi = 232.71

| terminus_a = I-81 in Scranton, Pennsylvania

| terminus_b = I-90 in Sturbridge, Massachusetts

| established = 1963

| notes = Serves four states: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 85

| length_mi = 666.05

| terminus_a = I-65 in Montgomery, Alabama

| terminus_b = I-95 in Petersburg, Virginia

| established = 1958

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 86

| dab = Idaho

| length_mi = 62.85

| terminus_a = I-84 near Declo, Idaho

| terminus_b = I-15 in Chubbuck, Idaho

| established = 1980

| notes = Idaho only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 86

| dab = Pennsylvania–New York

| length_mi = 254.02

| terminus_a = I-90 near North East, Pennsylvania

| terminus_b = NY 17/NY 79 in Windsor, New York

| established = 1999

| notes = Unfinished in New York; serves two states: Pennsylvania, New York

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 86

| dab = Connecticut–Massachusetts

| length_mi = 38.97

| terminus_a = I-84 in East Hartford, Connecticut

| terminus_b = I-90 in Sturbridge, Massachusetts

| established = 1968

| established_ref =

| circa_established =

| decommissioned = 1984

| decommissioned_ref =

| notes = Served two states: Connecticut, Massachusetts
Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 87

| dab = North Carolina

| length_mi = 12.90

| terminus_a = I-40/I-440/US 64/US 264 in Raleigh, North Carolina

| terminus_b = US 64/US 264 in Wendell, North Carolina

| established = 2017

| notes = Unfinished in North Carolina; North Carolina only; planned in one more: Virginia
Associated route: I-587

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 87

| dab = New York

| length_mi = 333.49

| terminus_a = I-278 in New York City

| terminus_b = A-15 at Canadian border in Champlain, New York

| established = 1957

| notes = New York only
Associated routes: I-287, I-587, I-787

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 88

| dab = Illinois

| length_mi = 140.60

| terminus_a = I-80/IL 92 in East Moline, Illinois

| terminus_b = I-290/IL 110 in Hillside, Illinois

| established = 1987

| notes = Illinois only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 88

| dab = New York

| length_mi = 117.75

| terminus_a = I-81 in Binghamton, New York

| terminus_b = I-90 in Schenectady, New York

| established = 1968

| notes = New York only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 89

| length_mi = 191.12

| terminus_a = I-93/SR 3A in Bow, New Hampshire

| terminus_b = Route 133/Future A-35 at Canadian border in Highgate, Vermont

| established = 1960

| notes = Serves two states: New Hampshire, Vermont
Associated route: I-189

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 90

| length_mi = 3,099.74

| terminus_a = SR 519/4th Avenue/Edgar Martinez Drive in Seattle, Washington

| terminus_b = MA 1A in Boston, Massachusetts

| established = 1956

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 91

| length_mi = 290.37

| terminus_a = I-95/Route 34 in New Haven, Connecticut

| terminus_b = A-55 at Canadian border in Derby Line, Vermont

| established = 1958

| notes = Serves three states: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 93

| length_mi = 189.95

| terminus_a = I-95/US 1 in Canton, Massachusetts

| terminus_b = I-91 in St. Johnsbury, Vermont

| established = 1957

| notes = Serves three states: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 94

| length_mi = 1,555.43

| terminus_a = I-90 in Lockwood, Montana

| terminus_b = Highway 402 at Canadian border in Port Huron, Michigan

| established = 1956

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 95

| length_mi = 1,905.96

| terminus_a = US 1 in Miami, Florida

| terminus_b = NB 95 at Canadian border in Houlton, Maine

| established = 1957

| notes = 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

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 96

| length_mi = 192.032

| terminus_a = US 31 in Norton Shores, Michigan

| terminus_b = I-75 in Detroit, Michigan

| established = 1959

| notes = Michigan only
Associated routes: I-196, I-296, I-496, I-696

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 97

| length_mi = 17.62

| terminus_a = US 50/US 301 in Annapolis, Maryland

| terminus_b = I-695/I-895A in Glen Burnie, Maryland

| established = 1987

| notes = Maryland only

| state =

}}

{{routelist row

| country = USA

| type = I

| route = 99

| length_mi = 161.68

| terminus_a = US 220 in Bedford, Pennsylvania

| terminus_b = I-86/NY 17 in Painted Post, New York

| established = 1998

| notes = Unfinished in Pennsylvania; serves two states: Pennsylvania, New York

| state =

}}

Other regions

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:

{{cquote|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.{{cite web |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/?redirect |title=FHWA Route Log and Finder List

|access-date=May 24, 2007 |author= Staff |publisher= Federal Highway Administration}}}}

=Hawaii=

{{maplink |type=line |frame=yes |plain=no |frame-width=300 |frame-height=260 |frame-coord={{coord|21.473|-157.9868}} |from=Interstates in Hawaii.map |text=Map of Hawaii's Interstate Highways (excluding H-201)|zoom=9}}

The Interstate Highways on the island of O{{okina}}ahu, 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.

{{routelist row

|state=HI

|type=I

|route=1

|terminus_a=Route 93 in Kapolei

|terminus_b=Route 72 in Honolulu

|established=1960

|length_mi=27.16

|notes=Associated route: H-201

}}

{{routelist row

|state=HI

|type=I

|route=2

|terminus_a=H-1 in Pearl City

|terminus_b=Route 99 in Wahiawa

|established=1960

|length_mi=8.33

|notes=none

}}

{{routelist row

|state=HI

|type=I

|route=3

|terminus_a=H-1/H-201 in Halawa

|terminus_b=Marine Corps Base Hawaii

|established=1997

|length_mi=15.32

|notes=none

}}

=Alaska=

{{maplink |type=line |frame=yes |plain=no |frame-width=300 |frame-height=240 |frame-coord={{coord|64|-152}} |frame-align=right |zoom=3 |from=List of Interstate Highways in Alaska.map |text=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.{{cite web |url=http://www.alaskaroads.com/Interstate-ends.htm |title=Alaska Roads: Interstate ends photos |access-date=May 24, 2007 |last=Voss |first=Oscar}}

{{routelist row

|state=AK

|type=I

|route=1

|sortkey=1

|length_mi=408.23

|terminus_a=Anchorage

|terminus_b=Canadian border in Alcan Border

|notes=Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway{{cite report|first=Jennifer W. |last=Witt |year=2010 |title=Annual Traffic Volume Report |edition=2008-2009-2010 |url=http://www.dot.state.ak.us/stwdplng/mapping/trafficmaps/trafficdata_reports_cen/2010_ATVR_FINAL_All_Posted.pdf |publisher=Alaska Department of Transportation & Public Facilities |access-date=March 15, 2012 |url-status=dead |archive-url=https://web.archive.org/web/20140330090745/http://www.dot.state.ak.us/stwdplng/mapping/trafficmaps/trafficdata_reports_cen/2010_ATVR_FINAL_All_Posted.pdf |archive-date=March 30, 2014 }}{{cite report |first= Ethan |last= Birkholz |year= 2010 |title= Annual Traffic Volume Report |edition= 2008-2009-2010 |url= http://www.dot.alaska.gov/stwdplng/mapping/trafficmaps/trafficdata_reports_nor/NRVolumeRpt2008-10.pdf |publisher= Alaska Department of Transportation & Public Facilities |access-date= May 31, 2012 |url-status= dead |archive-url= https://web.archive.org/web/20140417104824/http://www.dot.alaska.gov/stwdplng/mapping/trafficmaps/trafficdata_reports_nor/NRVolumeRpt2008-10.pdf |archive-date= April 17, 2014 |df= mdy-all }}{{cite web |author=Staff |publisher= Federal Highway Administration |url= http://www.dot.alaska.gov/stwdplng/transdata/routelists/interstate_mapset2006final.pdf |title=Dwight D. Eisenhower Interstate Routes Statewide |access-date=May 31, 2012}}{{cite web |author= Staff |publisher= Federal Highway Administration |url=http://www.dot.alaska.gov/stwdplng/transdata/routelists/interstate_2008_10.pdf |title=Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008 |access-date=May 31, 2012}}

|established=1976

}}

{{routelist row

|state=AK

|type=I

|route=2

|sortkey=2

|length_mi=202.18

|terminus_a=Tok

|terminus_b=Fairbanks

|notes=Alaska Highway, Richardson Highway

|established=1976

}}

{{routelist row

|state=AK

|type=I

|route=3

|sortkey=3

|length_mi=148.12

|terminus_a=Anchorage

|terminus_b=Soldotna

|notes=Seward Highway, Sterling Highway

|established=1976

}}

{{routelist row

|state=AK

|type=I

|route=4

|sortkey=4

|length_mi=323.69

|terminus_a=Gateway, {{nowrap|near Palmer}}

|terminus_b=Fairbanks

|notes=Parks Highway

|established=1976

}}

=Puerto Rico=

File:Puerto Rico Interstates.svg

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.{{cite web |url=http://www.hawaiihighways.com/Puerto-Rico-page2.html |title=Puerto Rico road photos |access-date=May 24, 2007 |last=Voss |first=Oscar}}

{{routelist row

|state=PR

|type=I

|route=1

|length_mi=71.08

|terminus_a= PR-2 in Ponce

|terminus_b= PR-2 in San Juan

|notes= Follows PR-52

|established= 1976

|length_ref=

}}

{{routelist row

|state=PR

|type=I

|route=2

|length_mi=138.13

|terminus_a= PR-1 in Ponce

|terminus_b= PR-3 in San Juan

|notes= Follows PR-22

|established= 1976

|length_ref=

}}

{{routelist row

|state=PR

|type=I

|route=3

|length_mi=40.56

|terminus_a= PR-3 in Humacao

|terminus_b= PR-2 in San Juan

|notes= Follows PR-66

|established=1976

|length_ref=

}}

References

External links

{{osmrelation|9703451}}
[http://www.alaskaroads.com/Interstate-ends.htm Alaska Roads - Interstate ends photos]
[http://www.hawaiihighways.com/Puerto-Rico-page2.html Puerto Rico road photos]
[https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/?redirect The Dwight D. Eisenhower National System of Interstate and Defense Highways Route Log and Finder List]
[http://www.kurumi.com/roads/3di/index.html 3-digit Interstate Highways]

Interstate

List of Interstate Highways

Contiguous United States

Other regions

=Hawaii=

=Alaska=

=Puerto Rico=

See also

References

External links