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From Wikipedia, the free encyclopedia

The auxiliary Interstate Highways (also called 3-digit Interstate Highways) is an additional network of freeways of the Interstate Highway System. Similar to the primary Interstate Highways, they also meet Interstate Standards, receive the same substantial federal funding, and comply with other federal standards. The main purpose of the auxiliary Interstate Highways is to serve large cities and suburbs and provide a supplement to the main Interstate Highways throughout the United States. There are also planned out to spare the availability of mainline 2-digit routes since some routes like I-196 are more of a substitute of a mainline 2-digit Interstate, I-196's parent I-96 itself is a mainline intrastate interstate.

In contrast to the primary Interstate Highways, the three-digit highways often run only within or around a single metropolitan city. In addition, they are generally shorter, and many do not cross state borders, despite the term "Interstate". Due to the large number of these routes, auxiliary route numbers may be repeated in different states along the mainline. However, no two three-digit Interstates in the same state can share the same number, unless 2 segments form a gap of a long route that is meant to be complete, such as I-696 which had urban complications in Michigan, although an instance like this is a spiritual exception to the rule.

Terminology and guidelines

The basic tenets of the auxiliary Interstates are divided into three branches: spur, loop, and bypass routes. Each one signifies a different characteristic of the auxiliary route.

The first digit of the three digits determines whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-515 contains an odd number in the first digit– "5", and indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-515 supplements to I-15.

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Spur route

A spur route usually represents one of the following:

  • It may serve another section of a city or metropolitan area not served by the main freeway (most often the central business district), terminating at a regular city street or substandard freeway.
  • It may represent the first portion of an extended freeway, that downgrades to below Interstate standards with plans to upgrade (such as I-540 in Arkansas).
  • It may connect two unrelated Interstate highways (such as I-390 in New York).

A spur route is preceded by an odd number in the first digit.[1]

  • Examples of spur routes are listed below.
I-110 in California links Interstate 10 to the Port of Los Angeles.
I-180 in Nebraska makes its way through Lincoln.

Sometimes, a three-digit highway branches off another three-digit highway; this is called a tertiary spur route of a two-digit highway. Tertiary spurs do not meet their parent highways, but are associated with them via the three-digit highways they do meet.

  • Examples of tertiary spur routes are listed below.
I-370 in Maryland branches off I-270, and is thus a tertiary spur of I-70.
I-380 in California is located at the San Francisco Bay Area; the route begins at I-280 and never connects to its parent I-80.
I-990 in New York is located near Buffalo, NY; the route begins at I-290 and never connects to its parent I-90.

Bypass

A bypass route may traverse around a city, or may run through it with the mainline bypassing. In a typical 3-digit Interstate Highway, bypasses usually have both its two termini junctioned with another Interstate highway. Bypass routes are preceded by an even number in the first digit.[1]

  • Examples of bypass routes are listed below.
I-215 in Utah travels the perimeter of Salt Lake City.
I-895 in Maryland serves as a bypass of downtown Baltimore.

Beltway

A beltway (also known as a loop route) completely surrounds a metropolitan city, and it is often connected with multiple junctions to other routes. Unlike other auxiliary Interstate Highways, beltways do not have termini. Beltways are also preceded by an even number in the first digit.

  • Examples of beltways are listed below.
I-465 in Indiana travels around the city of Indianapolis.
I-285 in Georgia encircles the city of Atlanta.
I-275 in Ohio, Kentucky and Indiana travels around the city of Cincinnati.

Exceptions

  • New York City has numerous spur routes from I-78 and I-95, but none of I-78's spur routes actually intersects with I-78. This is because I-78 was originally planned to continue east from its present terminus at the Holland Tunnel across Lower Manhattan, through Queens and across Long Island. This extension of I-78 was cancelled in the 1970s after I-278, I-478, I-678, and I-878 had already been established.
  • In the New York City area, I-495 does not connect to I-95 directly (but does intersect I-295, which does). The connector from the New Jersey Turnpike to the Lincoln Tunnel was to have been part of I-495 despite not currently being up to interstate standards, but became NJ 495 due to the cross-Manhattan part not being built. The cross-Manhattan part was to have connected the Lincoln Tunnel to the Queens-Midtown Tunnel. I-495 currently runs from the Queens-Midtown Tunnel to a terminus near Riverhead, New York on Long Island. An extension from there, crossing Long Island Sound to I-95 in Connecticut, was never built.
  • An auxiliary route numbered I-238 connects San Leandro and Castro Valley, California, yet there is no I-38. I-238 is so numbered as it was formerly numbered as State Route 238 and was designated an Interstate when it was upgraded Interstate standards. I-238 would have fit as an auxiliary route of I-80, but at the time of I-238's designation, all auxiliary routes of I-80 (I-280 through I-980; I-180 was not used because of a Caltrans policy forbidding number duplications and the prior existence of State Route 180) were already designated in California.
  • Sometimes, when a spur route from a mainline Interstate highway doesn't meet Interstate standards, a state route shield sometimes uses the parent Interstate route as a suffix to imply that it was derived from the route.

Auxiliary Interstates

Below is a list of auxiliary Interstate Highway designations in the United States. They are sorted in the following order:

  1. numerically by the primary Interstate Highway (one or two digits)
  2. alphabetically by the state of the auxiliary Interstate
  3. numerically by the auxiliary Interstate itself
Contents: H-1 I-5 I-10 I-15 I-16 I-20 I-24 I-25 I-26 I-29 I-30 I-35 I-38 I-40 I-44 I-45 I-55 I-59 I-64 I-65 I-66 I-69 I-70 I-71 I-72 I-74 I-75 I-76(E) I-77 I-78 I-79 I-80 I-81 I-82 I-83 I-84(E) I-84(W) I-85 I-86 I-87 I-89 I-90 I-91 I-93 I-94 I-95 I-96
Legend
Existing route Unsigned route Future route
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate H-1

I-H1.svg

Hawaii

H-201 4.10 mi (6.60 km) H-1 in Halawa H-1 in Honolulu
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 5

I-5.svg

California

I-105 17.32 mi (27.87 km) SR 1 in El Segundo I-605 in Norwalk
I-205 12.97 mi (20.87 km) I-580 near Tracy I-5 near Tracy
I-305 8.44 mi (13.58 km) I-80 in West Sacramento I-80 Bus. / US 50 / SR 99 in Sacramento
I-405 72.15 mi (116.11 km) I-5 in Irvine I-5 in Mission Hills
I-505 32.98 mi (53.08 km) I-80 in Vacaville I-5 in Dunnigan
I-605 27.40 mi (44.10 km) I-405 in Seal Beach I-210 in Irwindale
I-805 28.02 mi (45.09 km) I-5 in San Diego I-5 in San Ysidro
I-905 Proposed auxiliary route to connect to the Mexican border in the San Diego area

Oregon

I-105 3.49 mi (5.62 km) OR 99 in Eugene I-5 in Springfield
I-405 3.53 mi (5.68 km) I-5 in Portland I-5 in Portland

Oregon-Washington

I-205 36.64 mi (58.97 km) I-5 in Tualatin, OR I-5 in Salmon Creek, WA

Washington

I-405 30.30 mi (48.76 km) I-5 / SR 518 in Tukwila I-5 / SR 525 in Lynnwood
I-605 (big).svg I-605 Proposed to bypass Seattle
I-705 1.50 mi (2.41 km) I-5 / SR 7 in Tacoma Schuster Parkway in Tacoma
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 10

I-10.svg

California

I-110 20.43 mi (32.88 km) SR 47 in San Pedro, Los Angeles I-10 / SR 110 in Los Angeles
I-210 48.52 mi (78.09 km) I-5 in Sylmar SR 210 / SR 57 in Glendora
I-710 19.66 mi (31.64 km) Terminal Island in Long Beach Valley Boulevard in Alhambra

Florida

I-110 6.94 mi (11.17 km) No image wide.svg
US 98 Bus. near Pensacola
I-10 near Pensacola

Louisiana

I-110 8.89 mi (14.31 km) I-10 in Baton Rouge US 61 in Baton Rouge
I-210 12.40 mi (19.96 km) I-10 near Sulphur I-10 in Lake Charles
I-310 11.25 mi (18.11 km) US 90 in Boutte I-10 near Kenner
I-510 5.10 mi (8.21 km) Louisiana 47.svg LA 47 in New Orleans I-10.svg I-10 in New Orleans
I-610 4.52 mi (7.27 km) I-10 at the Orleans-Jefferson Parish I-10 in New Orleans
I-910 9.70 mi (15.61 km)
US 90 Bus. in Marrero
I-10 in New Orleans

Mississippi

I-110 4.10 mi (6.60 km) US 90 in Biloxi I-10 in D'Iberville

Texas

I-110 0.92 mi (1.48 km) United States-Mexico border in El Paso I-10 in El Paso
I-410 49.49 mi (79.65 km) Beltway around San Antonio
I-610 37.97 mi (61.11 km) Beltway around Houston
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 15

I-15.svg

California

I-215 54.50 mi (87.71 km) I-15 in Murrieta I-15 in Devore

Montana

I-115 1.19 mi (1.92 km) I-15 / I-90 in Butte Iron Street in Butte
I-315 0.83 mi (1.34 km) I-15 in Great Falls I-15 Bus. / US 89 Great Falls

Nevada

I-215 2.417 mi (3.890 km) I-15 / CC 215 near Paradise I-515 / US 93 / US 95 / SR 564 in Henderson
I-515 20.54 mi (33.06 km) US 93 / US 95 in Henderson I-15 / US 93 / US 95 in Las Vegas

Utah

I-215 29.02 mi (46.70 km) I-80 in Salt Lake City I-15 in North Salt Lake
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 16

I-16.svg

Georgia

I-516 6.49 mi (10.44 km) SR 21 / SR 204 in Savannah SR 21 in Garden City
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 20

I-20.svg

Georgia-South Carolina

I-520 17.48 mi (28.13 km) I-20 in Augusta, GA US 1 in North Augusta, SC

Louisiana

I-220 17.62 mi (28.36 km) I-20 in Shreveport I-20 in Bossier City

Mississippi

I-220 12.01 mi (19.33 km) I-20 in Jackson I-55 in Ridgeland

Texas

I-820 35.17 mi (56.60 km) Beltway around Fort Worth
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 24

I-24.svg

Tennessee

I-124 1.97 mi (3.17 km) I-24 in Chattanooga US-27 in Chattanooga
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 25

I-25.svg

Colorado

I-225 12.00 mi (19.31 km) I-25 in Denver I-70 in Aurora
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 26

I-26.svg

South Carolina

I-126 3.68 mi (5.92 km) I-26 in Columbia US 21 / US 76 / US 176 / US 321 in Columbia
I-526 19.26 mi (31.00 km) I-526 Bus. / US 17 in Mount Pleasant US 17 in Charleston
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 29

I-29.svg

Iowa-Nebraska

I-129 3.48 mi (5.60 km) US 20 / US 75 / US 77 in South Sioux City, NE I-29 / US 20 / US 75 in Sioux City, IA

Missouri

I-229 14.97 mi (24.09 km) I-29 in St. Joseph I-29 / US 59 / US 71 in St. Joseph

South Dakota

I-229 11.33 mi (18.23 km) I-29 in Sioux Falls I-90 near Sioux Falls
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 30

I-30.svg

Arkansas

I-130 Proposed route in Texarkana
I-430 12.93 mi (20.81 km) I-30 / U.S. 67 in Little Rock I-40 / U.S. 65 in Little Rock
I-530 46.65 mi (75.08 km) U.S. 65 in Pine Bluff I-30 / I-440 in Little Rock
I-630 7.40 mi (11.91 km) I-430 near Little Rock I-30 in Little Rock
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 35

I-35.svg

Iowa

I-235 13.78 mi (22.18 km) I-35 / I-80 in West Des Moines I-35 / I-80 near Des Moines

Kansas

I-135 95.74 mi (154.08 km) KTA / I-35 in Wichita I-70 / US-81 in Salina
I-235 16.52 mi (26.59 km) K-96 in Wichita I-135 in Wichita
I-335 50.13 mi (80.68 km) Kansas Turnpike.svg I-35 / US-50 in Emporia Kansas Turnpike.svg I-470 in Topeka

Kansas-Missouri

I-435 80.81 mi (130.05 km) Beltway around Kansas City, KS and Kansas City, MO
I-635 12.67 mi (20.39 km) I-35 in Overland Park, KS I-29 / US 71 in Kansas City, MO

Minnesota-Wisconsin

I-535 2.78 mi (4.47 km) I-35 / US 53 in Duluth, MN US 53 / WIS 35 in Superior, WI

Oklahoma

I-235 5.36 mi (8.63 km) I-35 / I-40 in Oklahoma City I-44 in Oklahoma City

Texas

I-635 37.00 mi (59.55 km) SH 121 in Grapevine I-20 in Balch Springs
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 38?

I-38.svg

California

I-238 2.16 mi (3.48 km) I-580 / SR 238 in Castro Valley I-880 in San Leandro
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 40

I-40.svg

Arkansas

I-440 9.96 mi (16.03 km) I-30 / I-530 near Little Rock I-40 / Hwy. 440 near Little Rock
I-540 80.72 mi (129.91 km) U.S. 271 / Hwy. 253 near Fort Smith U.S. 62 / U.S. 71 in Bentonville

North Carolina

I-140 27 mi (44 km) US 421 near Navassa US 17 near Ogden
I-240 9.14 mi (14.71 km) I-40 / I-26 near Asheville I-40 in eastern Asheville
I-440 16.40 mi (26.39 km) I-40 / US 1 / US 64 near Cary I-40 near Raleigh
I-540 26 mi (42 km) I-40 near Durham US 64 / US 264 near Knightdale
I-840 Future part of the Greensboro Urban Loop

Oklahoma

I-240 16.22 mi (26.10 km) I-44 / US-62 in Oklahoma City I-40 / US-270 in Oklahoma City

Tennessee

I-140 11.1 miles (17.86 km) I-40 / I-75 near Farragut US-129 near Alcoa
I-240 19.27 mi (31.01 km) I-40 in Memphis I-40 in Memphis
I-440 8 mi (13 km) I-40 in Nashville I-24 in Nashville
I-640 7.03 mi (11 km) I-40 in Knoxville I-40 in Knoxville
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 44

I-44.svg

Oklahoma

I-244 15.75 mi (25.35 km) I-44 in Tulsa I-44 in Tulsa
I-444 2.51 mi (4.04 km) I-244 in Tulsa I-244 in Tulsa
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 45

I-45.svg

Texas

I-345 1.4 mi (2.25 km) I-45 / I-35 in Dallas US 75 in Dallas
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 55

I-55.svg

Arkansas

I-555 44 mi (70.81 km) I-55.svg I-55 in Turrell Arkansas 91.svg AR 91 in Jonesboro

Illinois

I-155 32.13 mi (51.71 km) I-74 in Morton I-55 in Lincoln
I-355 32.51 mi (52.67 km) I-80 in New Lenox I-290 in Itasca

Illinois-Missouri

I-255 30.82 mi (49.90 km) I-55 / I-270 in Mehlville, MO IL 255 in Pontoon Beach, IL

Missouri-Tennessee

I-155 26.77 mi (43.08 km) I-55 near Hayti, MO US 51 at Dyersburg, TN
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 59

I-59.svg

Alabama

I-359 2.3 mi (3.70 km) I-20 / I-59 in southern Tuscaloosa 15th Street in downtown Tuscaloosa
I-459 32 mi (51.50 km) I-20 / I-59 in Bessemer I-59 in Trussville
I-759 4.5 mi (7.24 km) I-59 in Attalla US-411 / SR-759 in Gadsden
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 64

I-64.svg

Indiana

I-164 21.24 mi (34.18 km) I-64 / I-69 in Evansville US 41 in Evansville

Kentucky

I-264 22.93 mi (36.90 km) I-64 in Louisville I-71 in Louisville

Virginia

I-264 25 mi (40.23 km) I-64 / I-664 in Chesapeake King Street in Oceanfront
I-464 5.66 mi (9.11 km) I-64 in Chesapeake I-264 in Norfolk
I-564 2.77 mi (4.46 km) SR 337 I-64 in Norfolk
I-664 20.79 mi (33.46 km) I-64 / I-264 in Chesapeake I-64 in Hampton
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 65

I-65.svg

Alabama

I-165 4.9 mi (7.89 km) US-43 in Mobile I-65 in Mobile
I-565 34 mi (54.72 km) I-65 / US-72 / SR-20 in Decatur US-72 in Huntsville

Indiana

I-265 32 mi (51.50 km) I-64 in New Albany SR 62 / SR 265
I-465 53 mi (85.30 km) Beltway around Indianapolis
I-865 5 mi (8.05 km) I-65 near Indianapolis I-465 near Indianapolis

Kentucky

I-265 24.48 mi (39.40 km) I-65 in Louisville I-71 in Louisville
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 69

I-69.svg

Indiana

I-469 30.83 mi (49.62 km) I-69 in Fort Wayne I-69 in Fort Wayne

Mississippi-Tennessee

I-269 Memphis, TN outer beltline, currently under construction.
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 70

I-70.svg

Colorado

I-270 5.31 mi (8.55 km) I-25 / US 36 at Welby I-70 / US 36 at Denver

Missouri

I-170 11.17 mi (17.98 km) I-64 / US 40 in Richmond Heights I-270 in Hazelwood
I-470 16.72 mi (26.91 km) I-435 / US 50 / US 71 in Kansas City I-70 / Route 291 in Independence

Illinois-Missouri

I-270 14.97 mi (24.09 km) Missouri border on the Mississippi River I-55 / I-70 near Troy

Kansas

I-470 13.72 mi (22.08 km) I-70 in Topeka Kansas Turnpike.svg I-70 in Topeka

Kansas-Missouri

I-670 1.64 mi (2.64 km) I-70 in Kansas City, KS I-70 in Kansas City, MO

Maryland

I-270 34.40 mi (55.36 km) I-70 near Frederick I-495 north of Bethesda
I-370 3.13 mi (5.04 km) I-270 in Gaithersburg Shady Grove Metro Station

Missouri

I-270 35.62 mi (57.32 km) I-55 / I-255 in Green Park, MO Illinois border on the Mississippi River
I-470 16.72 mi (26.91 km) I-435 in Kansas City I-70 in Independence, Missouri

Ohio

I-270 54.97 mi (88.47 km) Beltway around Columbus
I-670 9.37 mi (15.08 km) I-70 in Columbus I-270 on the east side of Columbus, near Port Columbus International Airport, Easton Town Center, and Gahanna.

Ohio-West Virginia

I-470 6.69 mi (10.77 km) I-70 near Blaine, OH I-70 in Elm Grove, WV
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 71

I-71.svg

Kentucky-Ohio

I-471 5.75 mi (9.25 km) I-275 in Newport I-71 in Newport

Ohio

I-271 40 mi (64.37 km) I-71 in Cleveland I-90 in Cleveland
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 72

I-72.svg

Illinois

I-172 19.69 mi (31.69 km) I-72 in Quincy US 24 in Quincy
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 74

I-74.svg

Illinois

I-474 14.88 mi (23.95 km) I-74 in Peoria I-74 in Morton

North Carolina

I-274 Proposed route in Winston-Salem
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 75

I-75.svg

Florida

I-175 1.44 mi (2.32 km) I-275 in St. Petersburg SR 687 in St. Petersburg
I-275 63.39 mi (102.02 km) I-75 in Tampa Bay Area I-75 in Tampa Bay Area
I-375 1.34 mi (2.16 km) I-275 in St. Petersburg US 92 in St. Petersburg

Georgia

I-475 15.8 mi (25.43 km) I-75 in Macon I-75 in Macon
I-575 30.9 mi (49.73 km) I-75 in Atlanta SR 5 west of Nelson
I-675 11.04 mi (17.77 km) I-75 in Stockbridge I-285 southeast of Atlanta

Indiana-Kentucky-Ohio

I-275 83.71 mi (134.72 km) Beltway around Cincinnati, OH

Michigan

I-275 35.01 mi (56.34 km) I-75 near Monroe I-96 / I-696 / M-5 in Farmington Hills
I-375 1.06 mi (1.71 km) Greenspur 375 to Civic Center I-75 in Detorit
I-475 16.99 mi (27.34 km) I-75 in Grand Blanc Charter Township I-75 / US 23 in Mount Morris Charter Township
I-675 7.73 mi (12.44 km) I-75 / US 23 in Buena Vista Charter Township I-75 / US 23 in Kochville Township

Ohio

I-475 20.37 mi (33 km) I-75 in Perrysburg I-75 in Toledo
I-675 26.53 mi (43 km) I-75 near Miamisburg I-70 near Medway

Tennessee

I-275 2.98 mi (5 km) I-40 in Knoxville I-75 / I-640 in Knoxville
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 76 (east)

I-76.svg

Pennsylvania

I-176 11.33 mi (18.23 km) I-76 / Penna. Tpk. in Morgantown US 422 near Reading
I-276 32.65 mi (52.55 km) I-76 in King of Prussia NJ Turnpike Ext. in Bristol Township (current)
I-95 / I-195 in Bensalem (future)
I-376 80.6 mi (129.71 km) I-80 near Hermitage I-76 / US 22 in Monroeville
I-476 132.10 mi (212.59 km) I-95 near Chester I-81 near Clarks Summit
I-576 Proposed Southern Beltway route from Pittsburgh International Airport to I-376
I-676 6.90 mi (11.1 km) I-76 / US 30 in Philadelphia I-76 in Camden, NJ
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 77

I-77.svg

Ohio

I-277 4.14 mi (6.66 km) I-76 in Akron I-77 in Akron

North Carolina

I-277 4.41 mi (7.10 km)

Beltway around uptown Charlotte, North Carolina

Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 78

I-78.svg

New York

I-278 35.6 mi (57.3 km) US 1 / US 9 in Linden, NJ Bruckner Interchange in Bronx, New York City
I-478 2.14 mi (3.44 km) I-278 in Brooklyn, New York City NY 9A in Manhattan, New York City
I-678 14 mi (23 km) Airport Sign.svg John F. Kennedy International Airport in Queens, New York City Bruckner Interchange in Bronx, New York City
I-878 5.69 mi (9.16 km) Belt Parkway / NY 27 in Queens, New York City Atlantic Beach Bridge in Lawrence
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 79

I-79.svg

Pennsylvania

I-279 19.52 mi (31.41 km) I-79 / US 22 / US 30 near Pittsburgh I-79 in Franklin Park
I-579 1.57 mi (2.53 km) PA 885 in Pittsburgh I-279 / PA 28 in Pittsburgh
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 80

I-80.svg

California

I-280 57 mi (91.73 km) I-680 / US 101 in San Jose King Street in San Francisco
I-380 1.5 mi (2.41 km) I-280 in San Bruno US 101
I-580 71 mi (114.26 km) US 101 in San Rafael I-5 near Westley
I-680 71 mi (114 km) I-280 / US 101 in San Jose I-80 in Cordelia
I-780 6.52 mi (10.49 km) I-80 in Vallejo I-680 in Benicia
I-880 45 mi (72 km) I-280 / SR 17 in San Jose I-580 / I-80 in Oakland
I-980 2.02 mi (3.25 km) I-880 in Downtown Oakland I-580 / SR 24 in Oakland

Illinois

I-180 13.19 mi (21.22 km) IL 26 / IL 71 in Hennepin, Illinois I-80 near Princeton, Illinois

Illinois-Iowa

I-280 26.98 mi (43.42 km) I-80 near Davenport, IA I-74 / I-80 near Colona, IL

Iowa

I-380 73.05 mi (117.56 km) I-80 near Iowa City US 218 in Waterloo

Iowa-Nebraska

I-480 4.90 mi (7.89 km) I-80 / US 75 in Omaha, NE I-29 / US 6 in Council Bluffs, IA
I-680 42.86 mi (68.98 km) I-80 in Omaha, NE I-80 near Neola, IA

Nebraska

I-180 3.47 mi (5.58 km) US 34 in Lincoln I-80 / US 34 / US 77 in Lincoln

Nevada

I-580 4.99 mi (8.03 km) Neil Road in Reno I-80 in Reno

New Jersey

I-280 17.85 mi (28.73 km) I-80 in Parsippany-Troy Hills I-95 / NJ Turnpike in Kearny

Ohio

I-280 12.41 mi (19.97 km) I-75 in Toledo I-80 / I-90 / Ohio Tpk. in Lake Township
I-480 41.77 mi (67.22 km) I-80 / Ohio Tpk. near North Ridgeville I-80 / Ohio Tpk. near Streetsboro
I-680 16.43 mi (26.44 km) I-76 / Ohio Tpk. in North Lima, I-80 / SR 11 near Mineral Ridge,

Pennsylvania

I-180 28.85 mi (46.43 km) US 15 / US 220 in Williamsport I-80 / PA 147 near Milford
I-380 24.76 mi (39.85 km) I-80 in Tunkhannock Township I-81 / I-84 / US 6 in Dunmore

Wyoming

I-180 1.09 mi (1.75 km) I-80 in Cheyenne US 30 /Bus I-80
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 81

I-81.svg

New York

I-481 15.04 mi (24.2 km) I-81 in Onondaga I-81 / NY 481 in North Syracuse
I-781 4.9 mi (7.89 km) I-81 in Pamelia Fort Drum main gate in Le Ray

Virginia

I-381 1.70 mi (2.74 km) SR 381 in Bristol I-81 in Bristol
I-581 6.35 mi (10.22 km) US 220 / SR 24 in Roanoke I-81 near Hollins
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 82

I-82.svg

Washington

I-182 15.19 mi (24.45 km) I-82 / US 12 near Richland US 12 / US 395 in Pasco
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 83

I-83.svg

Pennsylvania

I-283 2.91 mi (4.683 km) I-76 / Penna. Tpk. near Highspire I-83 / US 322 /Capital Beltway near Harrisburg
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 84 (east)

I-84.svg

Connecticut

I-384 8.53 mi (13.73 km) I-84 / US 6 in East Hartford US 6 / US 44 in Bolton

New York/Connecticut

I-684 28.4 mi (45.7 km) I-287 near White Plains NY 22 near Brewster
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 84 (west)

I-84.svg

Idaho

I-184 3.62 mi (6.00 km) I-84 in Boise US-20 / US-26
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 85

I-85.svg

Georgia

I-185 49.30 mi (79.34 km) US 27 / US 280 / SR 520 in Columbus I-85 near LaGrange
I-285 63.98 mi (102.97 km) Beltway around Atlanta
I-985 24.04 mi (38.69 km) I-85.svg I-85 near Buford Georgia 369.svg SR 369 near Gainesville

North Carolina

I-285 23 mi (37 km) I-40 / US 52 / US 311 / NC 8 in Winston-Salem I-85 / US 52 / US 70 in Lexington
I-485 62 mi (99.78 km) NC 115 in Huntersville I-85 in Charlotte

North Carolina-Virginia

I-785 45 mi (72.42 km) I-40 / I-40 / I-85 in Greensboro, NC US 29 in Danville, VA

South Carolina

I-185 17.70 mi (28.49 km) I-385 near Mauldin US 29
I-385 42.16 mi (67.85 km) I-26 near Clinton US 276 in Greenvile
I-585 2.25 mi (3.62 km) US 221 in Spartanburg SC 56 / US 176 near Spartanburg
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 87

I-87.svg

New Jersey-New York

I-287 (Partial beltway around New York City) 98.65 mi (158.73 km) I-95 / NJ Turnpike in Edison, NJ I-95 in Rye, NY

New York

I-587 1.21 mi (1.95 km) I-87 / Thruway / NY 28 in Kingston NY 28 / NY 32 in Kingston
I-787 9.55 mi (15.37 km) I-87 / Thruway / I-87 in Albany NY 7 in Green Island
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 89

I-89.svg

Vermont

I-189 1.49 mi (2.4 km) US 7 in South Burlington I-89 in South Burlington
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 90

I-90.svg

Illinois

I-190 3.07 mi (5 km) Airport Sign.svg O'Hare International Airport in Chicago I-90 in Chicago
I-290 29.84 mi (48.02 km) I-90 / IL 53 in Rolling Meadows I-90 / I-94 /Congress Parkway in Chicago

Massachusetts

I-190 19.26 mi (31 km) I-290 in Worcester Route 2 in Leominster
I-290 20.16 mi (32.44 km) Mass Pike I-90 / I-395 in Auburn I-495 in Marlborough

New York

I-190 28.34 mi (45.61 km) I-90 / Thruway in Cheektowaga Highway 405 in Lewiston
I-290 9.80 mi (15.77 km) I-190 in Tonawanda I-90 / Thruway in Williamsville
I-390 75.86 mi (122.08 km) I-86 / NY 17 in Avoca I-490 in Gates
I-490 37.40 mi (60.19 km) I-90 / Thruway in Bergen I-90 / Thruway in Victor
I-590 5.07 mi (8.16 km) I-390 in Brighton I-490 / NY 590 in Rochester
I-690 14.19 mi (22.84 km) I-90 / Thruway / NY 690 in Van Buren I-481 in East Syracuse
I-790 2.41 mi (4 km) I-90 / Thruway in Deerfield NY 5A / NY 55 in Utica
I-890 9.45 mi (15.21 km) I-90 / Thruway in Rotterdam I-90 / Thruway in Guilderland
I-990 6.35 mi (10.22 km) I-290 in Amherst NY 263 near Lockport

Ohio

I-490 2.43 mi (4 km) I-90 / I-71 in Cleveland 55th Street East in Cleveland

South Dakota

I-190 2 mi (3 km) I-90 in Rapid City US 16 in Rapid City
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 91

I-91.svg

Connecticut

I-291 6.40 mi (10.3 km) I-91 in Windsor I-84 in Manchester
I-691 8.92 mi (14.36 km) I-84 at the Southington-Cheshire Town Line I-91 in Meriden

Massachusetts

I-291 5.44 mi[1] (8.75 km) I-91 in Springfield Mass Pike I-90 in Chicopee
I-391 4.86 mi (7.82 km) I-91 in Chicopee High Street in Holyoke
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 93

I-93.svg

New Hampshire

I-293 11.43 mi (18.39 km) I-93 / NH 101 in Manchester Everett Tpke. / I-93 Everett Turnpike in Hooksett
I-393 4.50 mi (7.24 km) I-93 in Concord NH 9 in Pembroke
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 94

I-94.svg

Illinois

I-294 53.42 mi (85.97 km) I-80 / I-94 in South Holland, Illinois I-94 in Deerfield, Illinois

Michigan

I-194 3.42 mi (5.5 km) I-94 in Battle Creek M-66 in Battle Creek

Minnesota

I-394 9.50 mi (15.30 km) I-494 / US 12 in Minnetonka 4th Street in Minneapolis
I-494 43 mi (69 km) I-94 / I-694 in Maple Grove I-94 / I-694 in Woodbury
I-694 31 mi (50 km) I-94 / I-494 in Maple Grove I-94 / I-494 in Woodbury

North Dakota

I-194 1.7 mi (2.7 km) McKenzie Drive near Bismarck I-94 near Mandan

Wisconsin

I-794 3.75 mi (6.04 km) I-43 / I-94 in Milwaukee WIS 794 in Milwaukee
I-894 9.30 mi (14.97 km) I-94 in Milwaukee I-43 / I-94 in Milwaukee
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 95

I-95.svg

Connecticut-Massachusetts

I-395 66.63 mi (107.23 km) I-95 in East Lyme, CT I-90 in Auburn, MA

Delaware

I-495 11.47 mi (18.46 km) I-95 / I-295 in Newport I-95 in Claymont

Delaware-New Jersey

I-295 73.50 mi (118.29 km) I-95 / I-495 in New Castle, DE I-95 / US 1 in Lawrence Township (current)
I-195 in Hamilton Township (future)

District of Columbia

I-695 1.39 mi (2.24 km) I-395 in Washington Pennsylvania Avenue in Washington

Florida

I-195 4.91 mi (7.90 km) I-95 / SR 112 in Miami SR 907 in Miami Beach
I-295 35.51 mi (57.15 km) I-95 / SR 9A in Jacksonville I-95 / SR 9A in Jacksonville
I-395 1.12 mi (2 km) I-95 MacArthur Causeway in Watson Island
I-595 13 mi (20 km) I-75 / SR 869 in Weston US 1 in Fort Lauderdale
I-795 Proposed route south of Jacksonville

Maine

I-195 1.55 mi (2.49 km) I-95 (Maine Turnpike) in Saco SR 5 in Saco
I-295 52 mi (84 km) I-95 in Scarborough I-95 in Gardiner
I-395 4.99 mi (8.03 km) I-95 / US 12 / SR 100 in Bangor US 1A in Brewer
I-495 3.7 mi (6 km) I-95 in Portland I-295 / US 1 in Falmouth

Maryland

I-195 4.88 mi (7.85 km) I-95 / MD 166 near Catonsville Airport Sign.svg Baltimore-Washington International Airport
I-395 1.98 mi (3.19 km) I-95 in South Baltimore West Pratt Street in Baltimore
I-595 19.97 mi (32 km) I-95 / I-495 / US 50 near Washington, DC US 50 / US 301 / MD 70 in Annapolis
I-695 51.46 mi (82.82 km) Beltway around Baltimore
I-795 8.99 mi (14.47 km) I-695 in Pikesville MD 140 in Reisterstown
I-895 11.44 mi (18.41 km) I-95 near Elkridge I-95 in Baltimore

Maryland-District of Columbia

I-295 8.05 mi (12.96 km) I-95 / I-495 near Forest Heights, MD I-695 in Washington, DC

Maryland-District of Columbia-Virginia

I-495 64.0 mi (103 km) Beltway around Washington, DC

Massachusetts

I-495 120.74 mi (194.31 km) I-195 in Wareham I-95 in Salisbury

New Jersey-Pennsylvania

I-195 34.17 mi (54.99 km) I-295 in Hamilton Township (current)
I-95 / I-276 in Bensalem Township, Pennsylvania (future)
Route 34 in Wall Township

New York

I-295 9.10 mi (14.65 km) NY 25 in Queens, New York City Bruckner Interchange in Bronx, New York City
I-495 71.02 mi (114.3 km) Queens Midtown Tunnel in Manhattan, New York City CR 58 in Riverhead
I-695 1.3 mi (2.1 km) I-95 in Bronx, New York City I-295 in Bronx, New York City
I-895 1.12 mi (1.8 km) I-278 in Bronx, New York City I-95 in Bronx, New York City

North Carolina

I-295 Planned route around the west side of Fayetteville
I-795 25.41 mi (40.9 km) US 70 / US 117 in Goldsboro, NC I-95 / US 264 in Wilson, NC

Rhode Island-Massachusetts

I-195 40.1 mi (64.5 km) I-95 in Providence, RI I-495 / Route 25 in Wareham, MA
I-295 26.58 mi (42.78 km) I-95 in Warwick, RI I-95 in Attleboro, MA

Virginia

I-195 3.50 mi (5.63 km) SR 195 in Richmond I-64 / I-95 in Richmond
I-295 52.75 mi (84.89 km) I-95 near Petersburg I-64 near Short Pump

Virginia-District of Columbia

I-395 13 mi (21 km) I-95 / I-495 in Springfield, VA US 50 in Washington, DC
Interstate Length[2] Southern/Western terminus Northern/Eastern terminus

Interstate 96

I-96.svg

Michigan

I-196 81 mi (130.35 km) I-94 in Benton Harbor I-96 in Grand Rapids
I-296 3.43 mi (5.52 km) I-196 in Grand Rapids I-96 / M-37 in Walker
I-496 11.78 mi (18.96 km) I-69 / I-96 in Lansing I-96 in Lansing
I-696 29.24 mi (47.04 km) I-96 / I-275 / M-5 in Novi I-94 in Roseville

See also

References

External links

Main Interstate Highways (major interstates highlighted)
4 5 8 10 12 15 16 17 19 20 22 24 25 26 27 29 30
35 37 39 40 43 44 45 49 55 57 59 64 65 66 68 69
70 71 72 73 74 75 76 (W) 76 (E) 77 78 79 80 81 82
83 84 (W) 84 (E) 85 86 (W) 86 (E) 87 88 (W) 88 (E) 89 90
91 93 94 95 96 97 99 (238) H-1 H-2 H-3
Unsigned  A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists  Primary  Main - Intrastate - Suffixed - Future - Gaps
Auxiliary  Main - Future - Unsigned
Other  Standards - Business - Bypassed

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