List of auxiliary Interstate Highways

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Dwight D. Eisenhower National System of Interstate and Defense Highways
Interstate 295 marker
Highway shield for Interstate 295
Interstate Highways in the 48 contiguous states
System information
Formed: June 29, 1956[1]
Highway names
Interstates: Interstate X (I-X)
System links

The auxiliary Interstate Highways (also called three-digit Interstate Highways) are a supplemental subset of the freeways of the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards, they receive the same percentage of federal funding (90%), and they comply with other federal standards. These shorter auxiliary routes branch off of main routes and are numbered based on the number of the parent route, such that all I-x95 routes are supplemental routes for I-95. Auxiliary routes are generally classified as spur routes (which connect to the parent route at one end), bypasses (which connect to the parent route at both ends), or beltways, which form a complete circle intersecting the parent route at two locations. There are some routes which connect to the parent route at one end, but connect to another route at the other end; some states treat these as spurs while others treat these as bypasses. While some exceptions do exist, generally spur routes are numbered with an odd hundreds digit (such as I-395), while bypasses and beltways are numbered with an even hundreds digit (such as I-695). Because longer interstates may have many such supplemental routes, the numbers may repeat in each state along their route, but they will not repeat within a state.

Terminology and guidelines[edit]

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 usually 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 shows that it is a supplement to I-15.

Routes that begin with an even number generally connect to the main highway in two locations, while odd numbers only connect in one location.

Spur route[edit]

An Interstate Highway spur route's number usually has an odd number for its first digit.[2] It is usually 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/avenue or at a substandard freeway, such as I-180 in Lincoln, Nebraska.
  • It may represent the first portion of a contemplated extended freeway, one that downgrades to below Interstate standards with plans to upgrade it later on. An example is I-540 in Arkansas.
  • It may connect two unrelated Interstate highways—such as I-390 in New York State and I-355 in Illinois do.
    • Note that states differ on their interpretation of the numbering convention in this case. In the I-390 example above, the route has both ends at Interstates, but not at the same Interstate on both ends, and is assigned an odd first digit. Another example is I-275 in Tennessee: it is a connector between I-40 and I-75 (a similar case of having both ends at Interstates but not at the same Interstate) and is assigned an even first digit.

Examples of Interstate Highway spur routes are listed below.

Sometimes, a three-digit Interstate Highway branches off from another three-digit Interstate Highway. These spurs do not connect directly with their parent highways, but are associated with them via the three-digit highways they do intersect with.

Examples are listed below.

Bypass[edit]

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.[2]

Examples of bypass routes are listed below.

In the case of an auxiliary Interstate highway which has both ends at Interstates but not the same Interstate, some states treat these as bypasses while others treat these as spurs — see Spur route above.

Beltway[edit]

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, however they have a place where the highway mileage resets to zero. Beltways are also preceded by an even number in the first digit.[2]

Examples of beltways are listed below.

Exceptions[edit]

Connection discrepancies[edit]

  • The Augusta area in Georgia also has a recent exception. I-520 had conformed to numbering conventions until late 2009 as well, when I-520 was extended in South Carolina back to I-20 and is now a loop.
  • In California, an auxiliary route of I-80, numbered I-238 connects San Leandro with Castro Valley, even though there is no I-38 anywhere. The highway was so numbered for simple convenience since it had been previously numbered as State Route 238. After this highway was upgraded to Interstate Highway standards, it was adopted into the Interstate Highway System. A number "I-x80" would have fit it as an auxiliary route of I-80, but at the time of I-238's designation, all of the auxiliary routes numbers of I-80 had already been used in California (Interstates 280 through 980). "I-180" was unavailable because the California Department of Transportation does not allow duplicate route numbers and there was already State Route 180 in existence at the time, though if there was a duplicate state route number as a continuation it would be a valid exception. I-480 is available today but was being used for the Embarcadero Freeway, which has since been demolished. Although I-5 is the next nearest primary Interstate, an I-x05 designation would not conform to the numbering convention because the route only links two auxiliary routes of I-80 (I-580 and I-880).
  • In the Los Angeles area, I-210 does not connect with I-10 directly, nor with any other auxiliary Interstate of I-10, although they are connected through numerous other Interstates. I-210 was formerly connected to I-10 by way of a segment of the Orange Freeway that is now designated State Route 57. When State Route 210 is re-signed I-210, it will finally reconnect with I-10.
  • New York City has numerous auxiliary routes designated as being from I-78, but none of the auxiliary routes of I-78 actually intersects with it. This is because I-78 was long ago intended to continue farther east from its present terminus at the eastern end of the Holland Tunnel. It was to cross southern Manhattan, then go through the boroughs of Brooklyn and Queens, and from there across Long Island. This entire planned part of I-78 was canceled during the 1970s, after I-278, I-478, I-678, and I-878 were already completely or partially in existence.
  • Also in the New York City area, I-495 does not connect with I-95 directly, but it does intersect with I-295, which in turn, intersects with I-95. The connector from the New Jersey Turnpike (which is signed as I-95 in northern New Jersey) to the Lincoln Tunnel was to have been part of I-495 despite not being up to the standards of the Interstate Highway System. The Mid-Manhattan Expressway was to have connected the Lincoln Tunnel with the Queens-Midtown Tunnel, but was canceled due to concerns regarding building such a highway in the densely built Midtown area. The LIE was eventually built from the end of the Queens-Midtown Tunnel to a terminus near Riverhead on Long Island. An extension from there, to cross the end of Long Island Sound to I-95 in Connecticut, was never built, which left I-495 as a spur. The New Jersey approach became New Jersey State Route 495.
  • In North Carolina, I-495 does not meet up with I-95. Instead, it connects two auxiliary routes of I-40: I-440 and I-540. When US 64 is upgraded, I-495 will connect with I-95.
  • Pittsburgh, Pennsylvania has two recently created exceptions. I-279 (and I-376, by some interpretations) had conformed to numbering conventions until 2009 when I-376 was extended from its previous terminus in Downtown Pittsburgh to its present terminus north of I-80. I-376 acted as a spur from its parent (I-76) in Monroeville (Allegheny County), but now links with I-76 in Lawrence County. Likewise, I-279 was a loop that met up with its parent (I-79) at two locations in Allegheny County, but now terminates in Downtown Pittsburgh (having been truncated at its intersection with I-376), and functions as a spur route from I-79.
  • Sometimes, when a spur route from a mainline Interstate highway does not meet Interstate Highway standards, a state route shield sometimes uses the parent Interstate route number as a suffix to imply that this number was derived from the Interstate Highway's, there are even examples of state route numbers that serve as a physical continuation to circumvent Interstate standards, though business spurs also serve that purpose as well. One example of this would be Virginia State Route 895, which directly connects to I-95 south of Richmond. The road was originally planned as I-895, but did not qualify for federal funding due to its status as a toll road, thus its current status as a state highway.

Short mainline routes[edit]

Some mainline routes (one or two-digit Interstates) are sometimes less than half the length of the longest auxiliary Interstates, thus they fall closer to the geographical criteria for auxiliary routes than they do for mainline routes.

  • I-27 goes from Lubbock, Texas, to Amarillo, Texas, for 100 miles (160 km).
  • I-86 in Idaho is a 63-mile (101 km) connector from I-84 to I-15.
  • I-97 runs for 17.6 miles (28.3 km) between Baltimore and Annapolis, Maryland, and does not connect to any other mainline route. It serves as a southward spur from I-895.
  • I-99 exists entirely within Pennsylvania, but does not connect directly with another Interstate via a limited-access interchange. The northern terminus of I-99 ends approximately 12 mile (0.80 km) south of I-80, and the two Interstates are connected via U.S. Route 220.

Interstate 35E and 35W[edit]

There are two short splits of I-35 in Minnesota and Texas. For 42 miles (68 km), I-35W serves the city of Minneapolis, and I-35E serves the city of St. Paul. In the Dallas-Fort Worth Metroplex in Texas, a separate I-35E serves Dallas and I-35W passes through Fort Worth. The Texas highways are longer at 97 and 85 miles (156 and 137 km), respectively.

Auxiliary Interstates[edit]

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-40 I-44 I-45 I-55 I-59 I-64 I-65 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-87 I-89 I-90 I-91 I-93 I-94 I-95 I-96 I-238
Legend
Existing route Unsigned route Future route
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate H-1[edit]

Hawaii

H-201 4.10 mi (6.60 km) H-1 in Halawa H-1 in Honolulu
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 5[edit]

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 Ysidro I-5 in San Diego near the University of California, San Diego
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 Proposed to bypass Seattle
I‑705 1.50 mi (2.41 km) I-5 / SR 7 in Tacoma Schuster Parkway in Tacoma
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 10[edit]

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 57 / SR 210 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) 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) LA 47 in New Orleans 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) Av Abraham Lincoln at the 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 15[edit]

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 in Great Falls

Nevada

I‑215 13 mi (20.921 km) I-15 / Clark County Route 215 near Paradise I-515 / US 93 / 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 16[edit]

Georgia

I‑516 6.49 mi (10.44 km) SR 21 / SR 204 in Savannah SR 21 in Garden City
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 20[edit]

Georgia–South Carolina

I-520 17.48 mi (28.13 km) I-20 in Augusta, GA I-20 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) I-20 in Fort Worth I-20 / US 287 in Fort Worth
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 24[edit]

Tennessee

I-124 1.97 mi (3.17 km) I-24 in Chattanooga US 27 in Chattanooga
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 25[edit]

Colorado

I‑225 12.00 mi (19.31 km) I-25 in Denver I-70 in Aurora
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 26[edit]

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) US 17 in Charleston I-526 Bus / US 17 in Mount Pleasant
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 29[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 30[edit]

Arkansas

I‑130 Proposed route in Texarkana
I‑430 12.93 mi (20.81 km) I-30 / US 67 in Little Rock I-40 / US 65 in Little Rock
I‑530 46.65 mi (75.08 km) US 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 35[edit]

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) Kan. Tpk. / I-35 in Wichita I-70 / US 81 in Salina
I‑235 16.52 mi (26.59 km) I-135 / US 81 in Wichita I-135 / US 81 / K-15 / K-254 in Wichita
I‑335 50.13 mi (80.68 km) I-35 / Kan. Tpk. / US 50 in Emporia I-470 / Kan. Tpk. 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 40[edit]

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) US 271 / Hwy. 253 near Fort Smith US 62 / US 71 in Bentonville

North Carolina

I‑140 6.80 mi (10.94 km) US 17 / US 421 near Navassa I-40 / US 17 in Wilmington
I‑240 9.14 mi (14.71 km) I-26 / I-40 / US 74 near Asheville I-40 / US 74A in Asheville
I‑440 16.40 mi (26.39 km) I-40 / US 1 / US 64 near Cary I-40 near Raleigh
I‑540 26.00 mi (41.84 km) I-40 near Durham US 64 / US 264 near Knightdale
I‑840 5.77 mi (9.29 km) I-40 / I-73 / US 421 in Greensboro I-40 / I-85 / I-785 / I-85 Bus. in Greensboro

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 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 44[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 45[edit]

Texas

I‑345 1.4 mi (2.25 km) I-30 / I-45 in Dallas US 75 in Dallas
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 55[edit]

Arkansas

I‑555 44 mi (70.81 km) I-55 in Turrell Hwy. 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 I-270 / 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 59[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 64[edit]

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 Parks Ave in Virginia Beach
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 Norfolk I-64 in Hampton
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 65[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 69[edit]

Indiana

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

Kentucky

I‑369 Henderson, KY Future I-69 / Pennyrile Parkway to Owensboro, KY US 60 23.441 mile spur to Owensboro

Mississippi–Tennessee

I-269 Memphis outer beltline, currently under construction

Tennessee

I-169 proposed spur from Union City to Martin, TN

Texas

I‑369 115 mile spur along US 59 from Tenaha to Texarkana, Texas partially completed in 2013
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 70[edit]

Colorado

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

Illinois–Missouri

I-270 50.59 mi (81.42 km) I-55 / I-255 in Mehlville, MO I-55 / I-70 near Troy, IL

Kansas

I‑470 13.72 mi (22.08 km) I-70 in Topeka I-70 / Kan. Tpk. in Topeka

Kansas–Missouri

I‑670 2.81 mi (4.52 km) I-70 in Kansas City, KS I-70 in Kansas City, MO

Maryland

I‑270 34.70 mi (55.84 km) I-70 near Frederick I-495 north of Bethesda
I‑270 Spur 2.10 mi (3.38 km) I-270 east of Potomac I-495 northwest of Bethesda
I‑370 3.13 mi (5.04 km) I-270 in Gaithersburg MD 200 in Derwood

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-49 / 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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 71[edit]

Kentucky–Ohio

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

Ohio

I‑271 40 mi (64.37 km) I-71 in Medina I-90 in Willoughby Hills
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 72[edit]

Illinois

I-172 19.69 mi (31.69 km) I-72 in Quincy US 24 in Quincy
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 74[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 75[edit]

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 near Memphis I-75 in Wesley Chapel
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 Kennesaw 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

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 Detroit
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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 76 (east)[edit]

Pennsylvania-New Jersey

I-676 6.90 mi (11.1 km) I-76 / US 30 in Philadelphia I-76 in Camden

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 Delaware River bridge (PA-NJ state line)(current)
I-95 / I-195 in Bristol Township (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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 77[edit]

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, NC

Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 78[edit]

New Jersey–New York

I-278 35.6 mi (57.3 km) US 1/9 in Linden, New Jersey Bruckner Interchange in Bronx, New York

New York

I-478 2.14 mi (3.44 km) I-278 in Brooklyn, New York NY 9A in Manhattan, New York
I-678 14 mi (23 km) John F. Kennedy International Airport in Queens, New York Bruckner Interchange in Bronx, New York
I-878 0.70 mi (1.13 km) I-678 in Queens, New York City near JFK Airport JFK Expressway in Queens, New York City near JFK Airport
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 79[edit]

Pennsylvania

I-279 13.20 mi (21.24 km) I-376 / US 22 / US 30 in Pittsburgh I-79 in Franklin Park
I-579 1.57 mi (2.53 km) PA 885 in Pittsburgh I-279 / PA 28 in Pittsburgh
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 80[edit]

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-80 / I-580 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 I-80 near Neola, IA

Nebraska

I‑180 3.47 mi (5.58 km) US 34 (9th St. / 10th St.) in Lincoln I-80 / US 34 / US 77 in Lincoln

Nevada

I‑580 34.50 mi (55.50 km) Fairview Drive in Carson City I-80 in Reno

New Jersey

I‑280 17.85 mi (28.73 km) I-80 in Parsippany-Troy Hills I-95 / NJ Tpk. 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 Milton
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 I-80 Bus / US 30
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 81[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 82[edit]

Washington

I‑182 15.19 mi (24.45 km) I-82 / US 12 near Richland US 12 / US 395 in Pasco
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 83[edit]

Pennsylvania

I-283 2.91 mi (4.683 km) I-76 / Penna Tpk. near Highspire I-83 / US 322 / Capital Beltway near Harrisburg
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 84 (east)[edit]

Connecticut

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

Connecticut–New York

I-684 28.4 mi (45.7 km) I-287 near White Plains NY 22 near Brewster
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 84 (west)[edit]

Idaho

I‑184 3.62 mi (6.00 km) I-84 in Boise US 20 / US 26
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 85[edit]

Alabama

I‑685 14.44 mi Proposed auxiliary route to connect Interstate 65 in downtown Montgomery to Interstate 85 in the eastern part of the city

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 near Buford SR 369 near Gainesville

North Carolina

I‑285 23.00 mi (37.01 km) I-85 / I-85 Bus. / US 29 / US 52 / US 70 near Lexington I-40 / US 52 / US 311 / NC 8 in Winston-Salem
I‑485 62.00 mi (99.78 km) NC 115 in Huntersville I-85 in Charlotte
I‑785 2.21 mi (3.56 km) I-40 / I-85 / I-840 / I-85 Bus. in Greensboro US 70 in Greensboro

South Carolina

I‑185 17.70 mi (28.49 km) I-385 near Mauldin US 29 in Greenville
I‑385 42.16 mi (67.85 km) I-26 near Clinton US 276 in Greenville
I‑585 2.25 mi (3.62 km) US 176 / US 221 / SC 9 in Spartanburg I-85 Bus. / US 176 near Spartanburg

Virginia

I‑785 7.20 mi (11.59 km) US 29 / US 58 / US 29 Bus. in Danville US 29 / US 58 / US 360 / US 58 Bus. in Danville
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 87[edit]

New Jersey–New York

I‑287 98.65 mi (158.73 km) I-95 / NJ Tpk. 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 in Albany NY 7 in Green Island
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 89[edit]

Vermont

I‑189 1.49 mi (2.4 km) US 7 in South Burlington I-89 in South Burlington
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 90[edit]

Illinois

I-190 3.07 mi (5 km) 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) I-90 / Mass Pike / 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-71 / I-90 in Cleveland East 55th Street in Cleveland

South Dakota

I‑190 2 mi (3 km) I-90 in Rapid City US 16 in Rapid City
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 91[edit]

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 I-90 / Mass Pike in Chicopee
I‑391 4.86 mi (7.82 km) I-91 in Chicopee High Street in Holyoke
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 93[edit]

New Hampshire

I‑293 11.43 mi (18.39 km) I-93 / NH 101 in Manchester I-93 / Everett Tpke in Hooksett
I‑393 4.50 mi (7.24 km) I-93 in Concord NH 9 in Pembroke
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 94[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 95[edit]

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 I-295 in Washington[4]

Florida

I‑195 4.424 mi (7.12 km) I-95 / SR 112 in Miami SR 905 in Miami Beach
I‑295 60.864 mi (97.95 km) Beltway around Jacksonville
I‑395 1.292 mi (2.08 km) I-95 MacArthur Causeway at Watson Island, Miami
I‑595 12.860 mi (20.70 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 Tpk. in Saco SR 5 in Saco
I‑295 52 mi (84 km) I-95 / Maine Tpk. in Scarborough I-95 / Maine Tpk. in Gardiner
I‑395 4.99 mi (8.03 km) I-95 / US 2 / SR 100 in Bangor US 1A in Brewer
I‑495 3.7 mi (6 km) I-95 / Maine Tpk. in Portland I-295 / US 1 in Falmouth

Maryland

I‑195 4.88 mi (7.85 km) I-95 / MD 166 near Catonsville 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 / Route 25 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) Hillside Avenue (NY 25)/NY 24 in Queens, New York City Bruckner Interchange in the 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 the Bronx, New York City I-295 in the Bronx, New York City
I-895 1.12 mi (1.8 km) I-278 in the Bronx, New York City I-95 in the Bronx, New York City

North Carolina

I‑295 Planned route around the west side of Fayetteville
I‑495 4.09 mi (6.58 km) I-440 / US 64 / US 64 Bus in Raleigh, NC I-540 / US 64 / US 264 in Knightdale, NC
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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 96[edit]

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
Number Length[3] Southern or western terminus Northern or eastern terminus

Interstate 238[edit]

California

I‑238 2.13 mi (3.43 km) I-880 in San Leandro I-580 / SR 238 in Castro Valley

See also[edit]

References[edit]

  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads (Washington, DC: Federal Highway Administration) 60 (1). Retrieved March 16, 2012. 
  2. ^ a b c DeSimone, Tony (October 31, 2002). "FHWA Route Log and Finder List: Interstate Route Numbering". Federal Highway Administration. Retrieved February 3, 2008. 
  3. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as DeSimone, Tony (October 31, 2002). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. Retrieved June 2, 2007. 
  4. ^ http://www.washingtonpost.com/blogs/mike-debonis/post/interstate-695-reappears-in-dc/2011/11/28/gIQAcelz5N_blog.html

External links[edit]