List of Auxiliary Interstate Highways
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List of Auxiliary Interstate Highways

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 within the Interstate Highway System of the United States. Similar to the mainline Interstate Highways, these highways also meet all Interstate Highway Standards (with rare exceptions), they receive the same percentage of federal funding (90%), and they comply with other federal standards.

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.

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. 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 from state to state along their route, but they will not repeat within a state.

Terminology and guidelines

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

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 this 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.

Numerous exceptions to the standard numbering guidelines exist in many places. This can be for a number of reasons. In some cases, original routes were changed, extended, or abandoned, leaving discrepancies in the system. In other cases, it may not be possible to use the proper number because the limited set of available numbers has been exhausted, causing a "non-standard" number to be used.

Spur route

A 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 include:

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 include:

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.[2]

Examples include:

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

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]

Some examples of beltways include:

Auxiliary Interstates

Note: the table sorts the route numbers by parent highway.
Number Length (mi)[3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
4.10 6.60 H-1 in Halawa, HI H-1 in Honolulu, HI 01989-01-011989[4] current Signed as Route 78 until 2004
17.32 27.87 SR 1 in El Segundo, CA I-605 in Norwalk, CA 01963-01-011963 current Replaced segments of SR 42
12.97 20.87 I-580 near Tracy, CA I-5 near Tracy, CA 01970-01-011970 current
6.00 9.66 I-80 in West Sacramento, CA I-80 Bus/US 50/SR 99 in Sacramento, CA 01981-01-011981 current Unsigned
72.15 116.11 I-5 in Irvine, CA I-5 in Mission Hills, CA 01964-01-011964 current
32.98 53.08 I-80 in Vacaville, CA I-5 in Dunnigan, CA 01977-01-011977 current Originally part of I-5W
27.40 44.10 I-405 in Seal Beach, CA I-210 in Irwindale, CA 01964-01-011964 current
28.02 45.09 I-5 in San Ysidro, CA I-5 in Sorrento Valley, CA 01959-01-011959 current
8.96[5] 14.42 I-5 in San Ysidro, CA Fed. 2 at the United States-Mexico border in Otay Mesa, CA proposed -- Currently SR 905, proposed to be signed as an Interstate
3.49 5.62 OR 99 in Eugene, OR I-5 in Springfield, OR 02011-01-012011 current
3.53 5.68 I-5 in Portland, OR I-5 in Portland, OR -- --
36.64 58.97 I-5 in Tualatin, OR I-5 in Salmon Creek, WA 01975-01-011975 current
30.30 48.76 I-5/SR 518 in Tukwila, WA I-5/SR 525 in Lynnwood, WA 01964-01-011964 current
-- -- -- -- proposed -- Proposed to bypass Seattle, WA
1.50 2.41 I-5/SR 7 in Tacoma, WA -- 01990-01-011990 current Schuster Parkway in Tacoma
-- -- I-10 in Mobile, AL (original southern terminus) I-65 in Prichard, AL -- -- Currently I-165, the route number was decommissioned because it had no connection to I-10
-- -- I-10/I-17 in Phoenix, AZ I-10 in Phoenix, AZ -- -- Now part of I-10 in Phoenix, AZ
-- -- I-10/SR 51 in Phoenix, AZ SR 101 in Phoenix, AZ -- -- Currently designated as SR 51 (Piestewa Freeway)
-- -- I-10 in Tucson, AZ North Campbell Avenue/East 6th Street in Tucson, AZ -- -- Mostly never built freeway that was to connect to University of Arizona campus from I-10
20.43 32.88 SR 47 in San Pedro, CA I-10/SR 110 in Los Angeles, CA 01978-01-011978 current Originally part of US 66, then signed as SR 11
48.72 78.41 I-5 in Sylmar, CA SR 57/SR 210 in Glendora, CA 01964-01-011964 current Segment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
19.66 31.64 Terminal Island in Long Beach, CA Valley Boulevard in Alhambra, CA 01983-01-011983 current Originally signed as SR 7
6.94 11.17 US 98 Bus. near Pensacola, FL I-10 near Pensacola, FL 01969-01-011969 current
8.89 14.31 I-10 in Baton Rouge, LA US 61 in Baton Rouge, LA 01964-01-011964 current
12.40 19.96 I-10 west of Lake Charles, LA I-10 east of Lake Charles, LA 01964-01-011964 current
11.25 18.11 US 90/LA 3127 in Boutte, LA I-10 west of Kenner, LA 01983-01-011983 current
2.70 4.35 US 90 Bus. in New Orleans, LA I-10 in New Orleans, LA 01964-01-011964 01969-01-011969 Cancelled Vieux Carré Riverfront Expressway
1.90 3.06 LA 67 in Baton Rouge, LA I-10 in Baton Rouge, LA 01961-01-011961 01964-01-011964 Renumbered as I-110
-- -- I-10 west of New Orleans, LA I-10 in New Orleans, LA 01969-01-011969 01977-01-011977 Cancelled southern bypass of New Orleans
3.04 4.89 LA 47 in New Orleans, LA I-10/LA 47 in New Orleans, LA 01992-01-011992 current
4.52 7.27 I-10 at Metairie-New Orleans, LA, line I-10 in New Orleans, LA 01965-01-011965 current
9.70 15.61 US 90 Bus. in Marrero, LA I-10/US 90 Bus. in New Orleans, LA 01999-01-011999 current Signed as part of US 90 Bus. and Future I-49
4.10 6.60 US 90 in Biloxi, MS I-10 in D'Iberville, MS 01988-01-011988 current
-- -- US 90 near the Port of Gulfport, MS I-10 in Gulfport, MS proposed -- Future spur into Gulfport, MS
0.92 1.48 Av Abraham Lincoln at the United States-Mexico border in El Paso, TX I-10 in El Paso, TX 01967-01-011967 current Shortest signed Interstate in the country
49.49 79.65 Beltway around San Antonio, TX 01959-01-011959 current
37.97 61.11 Beltway around Houston, TX 01975-01-011975 current
54.50 87.71 I-15 in Murrieta, CA I-15 in Devore, CA 01982-01-011982 current Originally signed as I-15E, then SR 215
1.19 1.92 I-15/I-90 in Butte, MT Iron Street in Butte, MT 01971-01-011971 current
0.83 1.34 I-15 in Great Falls, MT I-15 Bus/US 89 in Great Falls, MT 01960-07-231960 current Unsigned
11.10 17.86 I-15/Clark County Route 215 near Paradise, NV I-515/US 93/SR 564 in Henderson, NV 01996-01-011996 current
20.54 33.06 US 93/US 95 in Henderson, NV I-15/US 93/US 95 in Las Vegas, NV 01976-01-011976 current Not signed until 1994, this route is entirely concurrent with US 93/US 95
29.02 46.70 I-80 in Salt Lake City, UT I-15 in North Salt Lake, UT 01963-01-011963 current
6.49 10.44 SR 21/SR 204 in Savannah, GA SR 21 in Garden City, GA 01985-01-011985 current
5.40 8.69 I-285 in College Park, GA I-20 in Atlanta, GA 01983-01-011983 01986-01-011986 Never built, was planned to bypass Atlanta, GA
16.14 25.97 I-20 in Augusta, GA I-20 in North Augusta, SC 01980-01-011980 current
17.62 28.36 I-20/LA 3132 in Shreveport, LA I-20 in Bossier City, LA 01979-01-011979 current
10.20 16.42 I-20 in West Monroe, LA I-20 in Monroe, LA 01957-01-011957 01964-01-011964 Cancelled bypass of Monroe
12.01 19.33 I-20 in Jackson, MS I-55 in Ridgeland, MS 01981-01-011981 current
35.17 56.60 I-20 in Fort Worth, TX I-20/US 287 in Fort Worth, TX 01959-01-011959 current
-- -- I-22 near Birmingham, AL I-422 near Birmingham, AL proposed --
-- -- I-20/I-59/I-459/US 11 in Bessemer, AL I-59 in Argo, AL proposed -- If built, it will have no direct connections to I-22.
1.97 3.17 I-24 in Chattanooga, TN US 27 in Chattanooga, TN 01960-01-011960 current Unsigned
12.00 19.31 I-25 in Denver, CO I-70 in Aurora, CO 01976-01-011976 current
3.68 5.92 I-26 in Columbia, SC US 21/US 76/US 176/US 321 in Columbia, SC 01961-01-011961 current
5.24 8.43 I-26 in Cayce, SC SC 48 in Columbia, SC 01976-01-011976 01995-01-011995 Now part of I-77, formerly unsigned
19.26 31.00 US 17 in Charleston, SC I-526 Bus./US 17 in Mount Pleasant, SC 01989-01-011989 current
3.48 5.60 US 20/US 75/US 77 in South Sioux City, NE I-29/US 20/US 75 in Sioux City, IA 01976-01-011976 current
14.97 24.09 I-29 in St. Joseph, MO I-29/US 59/US 71 in St. Joseph, MO 01986-01-011986 current
11.33 18.23 I-29 in Sioux Falls, SD I-90 near Sioux Falls, SD 01966-01-011966 current
5 8 I-30/I-49 in Texarkana, AR US 59/US 71 near Texarkana, AR 02000-01-012000 02014-01-012014 Now part of I-49
12.93 20.81 I-30/US 67 in Little Rock, AR I-40/US 65 in Little Rock, AR 01980-01-011980 current
46.65 75.08 US 65 in Pine Bluff, AR I-30/I-440 in Little Rock, AR 01999-01-011999 current
7.40 11.91 I-430 near Little Rock, AR I-30 in Little Rock, AR 01985-01-011985 current
13.78 22.18 I-35/I-80 in West Des Moines, IA I-35/I-80 near Des Moines, IA 01961-01-011961 current
95.74 154.08 Kansas Turnpike/I-35 in Wichita, KS I-70/US 81 in Salina, KS 01976-01-011976 current
16.52 26.59 I-135/US 81 in Wichita, KS I-135/US 81/K-15/K-254 in Wichita, KS 01965-01-011965 current
50.13 80.68 I-35/Kansas Turnpike/US 50 in Emporia, KS I-470/Kansas Turnpike in Topeka, KS 01987-01-011987 current
80.81 130.05 Beltway around Kansas City, KS, and Kansas City, MO 01965-01-011965 current
8.90 14.32 I-35 in Overland Park, KS I-29/US 71 in Kansas City, MO 01968-01-011968 current
2.74[6] 4.41 I-94 in Minneapolis, MN I-35W in Minneapolis, MN 01964-01-011964 01978-01-011978 Cancelled
2.78 4.47 I-35/US 53 in Duluth, MN US 53/WIS 35 in Superior, WI 01971-01-011971 current
5.36 8.63 I-35/I-40 in Oklahoma City, OK I-44 in Oklahoma City, OK 01989-01-011989 current
37.00 59.55 SH 121 in Grapevine, TX I-20 in Balch Springs, TX 01959-01-011959 current
2.23 3.59 I-880 in San Leandro, CA I-580/SR 238 in Castro Valley, CA 01983-01-011983 current Considered an auxiliary route of I-80 in California; there is no I-38
9.96 16.03 I-30/I-530 near Little Rock, AR I-40/AR 440 near Little Rock, AR 02003-01-012003 current
15.87 25.54 US 271/AR 253 near Fort Smith, AR I-40 in Van Buren, AR 01965-01-011965 current
6.79 10.93 US 17/US 421 near Navassa, NC I-40/US 17 in Wilmington, NC 02008-01-012008 current
9.54 15.35 I-26/I-40/US 74 near Asheville, NC I-40/US 74A in Asheville, NC 01980-01-011980 current
16.77 26.99 I-40/US 1/US 64 near Cary, NC I-40 near Raleigh, NC 01991-01-011991 current
25.84 41.59 I-40 near Durham, NC I-87/US 64/US 264 near Knightdale, NC 01997-01-011997 current
5.77 9.29 I-40/I-73/US 421 in Greensboro, NC I-40/I-85/I-785/I-85 Bus. in Greensboro, NC 02011-01-012011 current
16.22 26.10 I-44/US 62 in Oklahoma City, OK I-40/US 270 in Oklahoma City, OK 01965-01-011965 current
9.96 16.03 I-40/I-240 near Oklahoma, OK I-35 in Oklahoma City, OK -- -- Now part of I-44
11.17 17.98 I-40 near Farragut, TN US 129 near Alcoa, TN 01987-01-011987 current
19.27 31.01 I-40 in Memphis, TN I-40 in Memphis, TN 01970-01-011970 current
7.64 12.30 I-40 in Nashville, TN I-24 in Nashville, TN 01987-01-011987 current
7.03 11.31 I-40 in Knoxville, TN I-40 in Knoxville, TN 01982-01-011982 current
77.28[7] 124.37 I-40 near Dickson, TN I-40 near Lebanon, TN 02016-01-012016 current
15.75 25.35 I-44 in Tulsa, OK I-44 in Tulsa, OK 01970-01-011970 current
2.51 4.04 I-244 in Tulsa, OK I-244 in Tulsa, OK 01970-01-011970 current Unsigned
1.40 2.25 I-30/I-45 in Dallas, TX US 75 in Dallas, TX 01973-01-011973 current Unsigned
49.80 80.15 I-55 in Turrell, AR AR 91 in Jonesboro, AR 02016-01-012016 current
32.13 51.71 I-74 in Morton, IL I-55 in Lincoln, IL 01992-01-011992 current
30.82 49.60 I-55/I-270 in Mehlville, MO I-270/IL 255 in Pontoon Beach, IL 01986-01-011986 current
32.51 52.32 I-80 in New Lenox, IL I-290 in Itasca, IL 01989-01-011989 current
15.93 25.64 I-55 near Hayti, MO US 51 at Dyersburg, TN 01980-01-011980 current
-- -- I-55/I-240 in Memphis, TN I-40 in Memphis, TN -- -- Now part of I-55 and I-240
2.30 3.70 I-20/I-59 in southern Tuscaloosa, AL 15th Street in downtown Tuscaloosa, AL 01983-01-011983 current
32.80 52.79 I-20/I-59 in Bessemer, AL I-59 in Trussville, AL 01984-01-011984 current
4.50 7.24 I-59 in Attalla, AL US 411/SR 759 in Gadsden, AL 01986-01-011986 current
21.39[8] 34.42 US 41/Veterans Memorial Parkway in Evansville, IN I-69 in Evansville, IN 01990-01-011990 02014-01-012014 Decommissioned; now part of I-69[9]
22.93 36.90 I-64 in Louisville, KY I-71 in Louisville, KY 01956-01-011956 current
25.07 40.35 I-64/I-664 in Chesapeake, VA Parks Ave in Virginia Beach, VA 01960-01-011960 current
4.71 7.58 I-64 in Chesapeake, VA I-264 in Norfolk, VA 01960-01-011960 current
3.03 4.88 SR 337 I-64 in Norfolk, VA 01970-01-011970 current
20.21 32.52 I-64/I-264 in Norfolk, VA I-64 in Hampton, VA 01971-01-011971 current
4.90 7.89 US 43 in Mobile, AL I-65 in Mobile, AL 01994-01-011994 current
21.40 34.44 I-65/US 72/SR 20 in Decatur, AL US 72 in Huntsville, AL 01991-01-011991 current
2.70 4.35 I-65/I-70 in Indianapolis, IN 38th Street in Indianapolis, IN 01978-01-011978 01981-01-011981 Was to be a spur linking from I-65/70 to 38th Street entirely with Indianapolis
6.73 10.83 I-64 in New Albany, IN SR 62/SR 265 in Clarksville, IN 01977-01-011977 current Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
52.79 84.96 Beltway around Indianapolis 01970-01-011970 current
4.72 7.60 I-65 near Indianapolis, IN I-465 near Indianapolis 02002-01-012002 current
24.48 39.40 I-65/KY 841 in Heritage Creek, KY I-71/KY 841 in Prospect, KY 01977-01-011977 current Connected with I-265 in Indiana on December 18, 2016, with the completion of the East End Bridge
-- -- I-40 in Nashville, TN I-65 in Nashville, TN -- -- Now part of I-65
72.18 116.16 US 60/US 231 in Owensboro, KY I-65 in Bowling Green, KY proposed -- Proposed for designation along William H. Natcher Parkway once updated to Interstate standards
1.79 2.88 -- -- -- 01972-01-011972 Proposed loop route of I-66 between the District, and Arlington County; if built, would have been the only auxiliary route of I-66; cancelled in the face of community opposition during Washington's freeway revolts
34.27 55.15 I-24 near Hopkinsville, KY I-69 in Nortonville, KY 02017-05-072017 current New designation along the former Pennyrile Parkway
23.441 37.725 I-69/Pennyrile Parkway in Henderson, KY US 60 in Owensboro, KY proposed -- Proposed for designation along Audubon Parkway once upgraded to Interstate standards
4.20 6.76 I-55/I-69 in Hernando, MS I-69 in Millington, TN 02015-01-012015 current Currently under construction; partially open
18.7 30.1 US 45W/US 51 in Union City, TN US 45E/SR 43 in Martin, TN proposed -- Proposed for designation along SR 22 once upgraded to Interstate standards
30.83 49.62 I-69 in Fort Wayne, IN I-69 in Fort Wayne, IN 01995-01-011995 current
1.50 2.41 I-69E/US 77/US 83 in Olmito, TX Port of Brownsville main entrance in Brownsville, TX 02015-01-012015 current Currently under construction; partially open and co-signed with SH 550
3.50 5.63 Tenaha, TX Texarkana, TX 02013-01-012013 current Partially completed in 2013. Eventually, it will surpass I-476 as the longest Auxiliary Interstate in the country.
5.31 8.55 I-25/US 36 at Welby, CO I-70/US 36 at Denver, CO 01965-01-011965 current
-- -- Beltway around Denver Metro, CO -- -- Now part of SH 470
50.59 81.42 I-55/Interstate 255 I-55/I-70 near Troy, IL 01956-01-011956 current
13.72 22.08 I-70 in Topeka, KS I-70/Kansas Turnpike in Topeka, KS 01960-01-011960 current
2.81 4.52 I-70 in Kansas City, KS I-70 in Kansas City, MO 01968-01-011968 current
2.30 3.70 I-70 in Baltimore, MD US 40 in Baltimore, MD 01969-01-011969 01983-01-011983 Cancelled
32.60 52.46 I-70 near Frederick, MD I-495 north of Bethesda, MD 01975-01-011975 current
2.10[10] 3.38 I-270 east of Potomac, MD Interstate 495I-495 northwest of Bethesda, MD 01975-01-011975 current Serves as an alternate connector for Virginia travelers
2.54 4.09 I-270 in Gaithersburg, MD MD 200 in Derwood, MD 01988-01-011988 current
11.17 17.98 I-64/US 40 in Richmond Heights, MO I-270 in Hazelwood, MD 01956-01-011956 current
16.72 26.91 I-49/I-435 in Kansas City, MO I-70 in Independence, MO 01983-01-011983 current
54.97 88.47 Beltway around Columbus, OH 01964-01-011964 current
6.69 10.77 I-70 near Blaine, OH I-70 in Elm Grove, WV 01976-01-011976 current
9.37 15.08 I-70 in Columbus, OH I-270 near John Glenn Columbus International Airport 02003-01-012003 current
46.06 74.13 I-71 near Medina, OH I-90 in Willoughby Hills, OH 01964-01-011964 current
5.75 9.25 I-275 near Newport, KY I-71 in Cincinnati, OH 01981-01-011981 current
19.69 31.69 I-72 in Quincy, IL US 24 in Quincy, IL 01995-01-011995 current
14.88 23.95 I-74 in Peoria, IL I-74 in Morton, IL 01973-01-011973 current
-- -- -- -- proposed -- Proposed route in Winston-Salem, NC
1.44 2.32 I-275 in St. Petersburg, FL SR 687 in St. Petersburg, FL 01980-01-011980 current
60.64 97.59 I-75 near Memphis, FL I-75 in Wesley Chapel, FL 01973-01-011973 current
1.34 2.16 I-275 in St. Petersburg, FL US 92 in St. Petersburg, FL 01979-01-011979 current
-- -- US 82 in Albany, GA I-75 in Cordele, GA -- -- Now part of SR 300
15.83 25.48 I-75 in Macon, GA I-75 in Macon, GA 01965-01-011965 current
30.97 49.84 I-75 in Kennesaw, GA SR 5 west of Nelson, GA 01985-01-011985 current
11.04 17.77 I-75 in Stockbridge, GA I-285 southeast of Atlanta, GA 01987-01-011987 current
83.71 134.72 Beltway around Cincinnati, OH 01962-01-011962 current Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
35.01[11][a] 56.34 I-75 near Monroe, MI I-96, I-696 and M-5 in Farmington Hills, MI 01977-01-011977 current
1.06 1.71 BS I-375 in Detroit, MI I-75 in Detroit, MI 01964-01-011964 current
16.99 27.34 I-75 near Grand Blanc, MI I-75/US 23 near Mount Morris, MI 01973-01-011973 current Runs east and north of Flint, MI
7.72 12.42 I-75/US 23 near Saginaw, MI I-75/US 23 near Zilwaukee, MI 01971-01-011971 current
20.37 32.78 I-75 in Perrysburg, OH I-75 in Toledo, OH 01964-01-011964 current
26.53 42.70 I-75 near Miamisburg, OH I-70 near Medway, OH 01987-01-011987 current
-- -- I-75 in Chattanooga, TN I-75 in Lexington, KY -- --
2.98 4.80 I-40 in Knoxville, TN I-75/I-640 in Knoxville, TN 01982-01-011982 current
-- -- I-40/I-75 near Knoxville, TN I-75 near Knoxville, TN -- -- Cancelled
6.90 11.10 I-76/US 30 in Philadelphia, PA I-76 in Camden, NJ 01991-01-011991 current
11.33 18.23 I-76/Pennsylvania Turnpike in Morgantown, PA US 422 near Reading, PA 01964-01-011964 current
32.65 52.55 I-76 in King of Prussia, PA Delaware River bridge (Pennsylvania-New Jersey state line)(current)
I-95/I-295 in Bristol Township, PA (future)
01964-01-011964 current
78.70 126.66 I-80 near Hermitage, PA I-76/US 22 in Monroeville, PA 01972-01-011972 current
129.61 208.59 I-95 near Chester, PA I-81/US 6/US 11 near Clarks Summit, PA 01992-01-011992 current
-- -- -- -- proposed -- Proposed Southern Beltway route from Pittsburgh International Airport to I-376
-- -- -- -- 01971-01-011971 01972-01-011972 Short lived renumbering of I-479, now I-579
4.46 7.18 Beltway around uptown Charlotte, NC 01981-01-011981 current
4.14 6.66 I-76 in Akron, OH I-77 in Akron, OH 01970-01-011970 current
-- -- -- -- -- 01971-01-011971 Cancelled
-- -- -- -- 01968-01-011968 01971-01-011971 Replaced by PA Route 378
35.62 57.32 US 1/9 in Linden, NJ Bruckner Interchange in Bronx, NY 01961-01-011961 current
2.14 3.44 I-278 in Brooklyn, NY NY 9A in Manhattan, NY 01971-01-011971 current Unsigned
14.33 23.06 John F. Kennedy International Airport in Queens, NY Bruckner Interchange in Bronx, NY 01965-01-011965 current
0.70 1.13 I-678 in Queens, NY, near John F. Kennedy International Airport JFK Expressway in Queens, NY, near JFK Airport 01970-01-011970 current Unsigned
-- -- -- -- 01958-01-011958 01968-01-011968 Replaced by its parent route, I-79
13.32 21.44 I-376/US 22/US 30 in Pittsburgh, PA I-79 in Franklin Park, PA 01972-01-011972 current
-- -- -- -- 01966-01-011966 01971-01-011971 Early number for I-579
1.57 2.53 PA 885 in Pittsburgh, PA I-279/PA 28 in Pittsburgh 01962-01-011962 current
-- -- US 101 in San Rafael, CA I-80 near Berkeley, CA 01978-01-011978 01991-01-011991 Temporary designation of what was formerly part of SR 17, now part of I-580
57.22 92.09 I-680/US 101 in San Jose, CA King Street in San Francisco, CA 01964-01-011964 current
1.671 2.689 I-280 in San Bruno, CA US 101 in San Bruno, CA 01964-01-011964 current
-- -- I-80 in San Francisco, CA Sansome Street in San Francisco, CA 01957-01-011957 01968-01-011968 Was to be the Embarcadero Freeway; downgraded to a state highway in 1968 and fully decommissioned in 1991
75.63 121.71 US 101 in San Rafael, CA I-5 near Westley, CA 01964-01-011964 current Segments were originally part of I-5W
70.52 113.49 I-280/US 101 in San Jose, CA I-80 in Cordelia, CA 01955-01-011955 current Originally SR 21
6.50 10.46 I-80 in Vallejo, CA I-680 in Benicia, CA 01955-01-011955 current Originally part of I-680
47.22 75.99 I-280/SR 17 in San Jose, CA I-80/I-580 in Oakland, CA 01983-01-011983 current Originally part of SR 17
-- -- I-80 in West Sacramento, CA I-80 in Sacramento, CA 01971-01-011971 01983-01-011983 Now part of I-80
2.03 3.27 I-880 in Oakland, CA I-580/SR 24 in Oakland, CA 01981-01-011981 current
30.09 48.43 US 50 in Carson City, NV I-80 in Reno, NV 02012-01-012012 current Runs concurrently with US 395
13.19 21.23 IL 26/IL 71 in Hennepin, IL I-80 near Princeton, IL 01969-01-011969 current
26.98 43.42 I-80 near Davenport, IA I-74/I-80 near Colona, IL 01990-01-011990 current
73.05 117.56 I-80 near Iowa City, IA US 218 in Waterloo, IA 01985-01-011985 current Connects Cedar Rapids, IA, with I-80
4.90 7.89 I-80/US 75 in Omaha, NE I-29/US 6 in Council Bluffs, IA 01966-01-011966 current
42.86 68.98 I-80 in Omaha, NE I-80 near Neola, IA 01966-01-011966 current
3.18 5.12 US 34 in Lincoln, NE I-80/US 34/US 77 in Lincoln, NE 01965-01-011965 current
-- -- -- -- 01958-01-011958 01965-01-011965 Now designated as I-680
1.60 2.57 I-480 in Omaha, NE Lake Street in Omaha, NE 01976-01-011976 01982-01-011982 Now part of US 75
17.85 28.73 I-80 in Parsippany-Troy Hills, NJ I-95/New Jersey Turnpike in Kearny, NJ 01958-01-011958 current
12.41 19.97 I-75 in Toledo, OH I-80/I-90/Ohio Turnpike in Lake Township, OH 01959-01-011959 current
-- -- I-76/I-77 in Akron, OH I-271 in Macedonia, OH proposed --
41.77 67.22 I-80/Ohio Turnpike in North Ridgeville, OH I-80/Ohio Turnpike in Streetsboro, OH 01971-01-011971 current
16.43 26.44 I-76/Ohio Turnpike in North Lima, OH I-80/SR 11 near Mineral Ridge, OH 01964-01-011964 current
28.85 46.43 US 15/US 220 in Williamsport, PA I-80/PA 147 near Milton, PA 01984-01-011984 current
-- -- -- -- -- -- Now part of I-176
-- -- -- -- 01958-01-011958 01964-01-011964 Now part of Pennsylvania Turnpike
24.76 39.85 I-80 in Tunkhannock Township, PA I-81/I-84/US 6 in Dunmore, PA 01973-01-011973 current
-- -- -- -- -- -- Now part of I-476
-- -- -- -- 01958-01-011958 01964-01-011964 Now I-676
1.09 1.75 I-80 in Cheyenne, WY I-80 Bus./US 30 in Cheyenne, WY 01984-01-011984 current Not built to Interstate Highway standards
15.04 24.20 I-81 in Onondaga, NY I-81/NY 481 in North Syracuse, NY 01970-01-011970 current
4.30 6.92 I-81 in Pamelia, NY Fort Drum main gate in Le Ray, NY 02012-01-012012 current
1.67 2.69 SR 381 in Bristol, VA I-81 in Bristol, VA 01961-01-011961 current
6.64 10.69 US 220/SR 24 in Roanoke, VA I-81 near Hollins, VA -- --
15.19 24.45 I-82/US 12 near Richland, WA US 12/US 395 in Pasco, WA 01986-01-011986 current
2.91 4.68 I-76/Pennsylvania Turnpike near Highspire, PA I-83/US 322/Capital Beltway near Harrisburg, PA 01972-01-011972 current
8.20 13.20 I-84/US 6 in East Hartford, CT US 6/US 44 in Bolton, CT 01984-01-011984 current
28.47 45.82 I-287 near White Plains, NY NY 22 near Brewster, NY 01974-01-011974 current Also crosses into Connecticut
3.62 5.83 I-84 in Boise, ID US 20/US 26 01990-01-011990 current
14.00 22.53 I-65 in downtown Montgomery, AL I-85 in Montgomery, AL proposed --
49.30 79.34 US 27/US 280/SR 520 in Columbus, GA I-85 near LaGrange, GA 01979-01-011979 current
63.98 102.97 Beltway around Atlanta, GA 01969-01-011969 current
5.9 9.5 I-75/I-85 in Atlanta, GA I-85 in Atlanta 01964-01-011964 01975-01-011975 Now Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
24.04 38.69 I-85 near Buford, GA SR 369 near Gainesville, GA 01985-01-011985 current
-- -- I-85/I-85 Bus./US 29/US 52/US 70 near Lexington, NC I-40/US 52/US 311/NC 8 in Winston-Salem, NC proposed --
66.68 107.31 Beltway around Charlotte, NC 01988-01-011988 current
2.21 3.56 I-40/I-85/I-840/I-85 Bus. in Greensboro, NC US 70 in Greensboro, NC 02013-01-012013 current Future northern terminus at US 29/US 58/US 360/US 58 Bus. in Danville, VA
-- -- -- -- proposed --
17.70 28.49 I-385 near Mauldin, SC US 29 in Greenville, SC 01955-01-011955 current
42.16 67.85 I-26 near Clinton, SC US 276 in Greenville, SC 01962-01-011962 current
2.25 3.62 US 176/US 221/SC 9 in Spartanburg, SC I-85 Bus./US 176 near Spartanburg, SC 01962-01-011962 current
98.72 158.87 I-95/New Jersey Turnpike in Edison, NJ I-95 in Rye, NY 01961-01-011961 current
1.21 1.95 I-87/New York State Thruway/NY 28 in Kingston, NY NY 28/NY 32 in Kingston, NY 01960-01-011960 current
-- -- Future I-87 (current US 64) near Zebulon, NC US 264 near Greenville, NC proposed[14] --
10.16 16.35 I-87/New York State Thruway in Albany, NY NY 7 in Green Island, NY 01968-01-011968 current
1.49 2.40 US 7 in South Burlington, VT I-89 in South Burlington, VT 01980-01-011980 current
3.07 4.94 O'Hare International Airport in Chicago, IL I-90 in Chicago, IL 01978-01-011978 current
29.84 48.02 I-90/IL 53 in Rolling Meadows, IL I-90/I-94/Congress Parkway in Chicago, IL 01972-01-011972 current
-- -- I-294 I-90 proposed -- Proposed route number for the O'Hare West Bypass[15]
19.26 31.00 I-290 in Worcester, MA Route 2 in Leominster, MA 01983-01-011983 current
20.16 32.44 I-395 in Auburn, MA I-495 in Marlborough, MA 01970-01-011970 current
28.34 45.61 I-90/New York State Thruway in Cheektowaga, NY Highway 405 at Lewiston, NY 01959-01-011959 current
9.80 15.77 I-190 in Tonawanda, NY I-90/New York State Thruway in Williamsville, NY 01964-01-011964 current
76.06 122.41 I-86/NY 17 in Avoca, NY I-490 in Gates, NY 01973-01-011973 current
37.40 60.19 I-90/New York State Thruway in Bergen, NY I-90/New York State Thruway in Victor, NY 01970-01-011970 current
5.31 8.55 I-390 in Brighton, NY I-490/NY 590 in Rochester, NY 01980-01-011980 current
14.19 22.84 I-90/New York State Thruway/NY 690 in Van Buren, NY I-481 in East Syracuse, NY 01962-01-011962 current
2.41 3.88 I-90/New York State Thruway in Deerfield, NY NY 5A/NY 55 in Utica, NY 01961-01-011961 current
9.35 15.05 I-90/New York State Thruway in Rotterdam, NY I-90/New York State Thruway in Guilderland, NY 01962-01-011962 current
6.35 10.22 I-290 in Amherst, NY NY 263 near Lockport, NY 01985-01-011985 current Highest numbered Interstate in the Interstate system
2.43 3.91 I-71/I-90 in Cleveland, OH East 55th Street in Cleveland, OH 01990-01-011990 current
1.72 2.77 I-90 in Rapid City, SD US 16 in Rapid City, SD 01962-01-011962 current
6.02 9.69 I-91 in Windsor, CT I-84 in Manchester, CT 01994-01-011994 current
8.38 13.49 I-84 at the Southington-Cheshire, CT, town line I-91 in Meriden, CT 01988-01-011988 current
5.44 8.75 I-91 in Springfield, MA I-90/Massachusetts Turnpike in Chicopee, MA 01972-01-011972 current
4.46 7.18 I-91 in Chicopee, MA High Street in Holyoke, MA 01970-01-011970 current
11.18 17.99 I-93/NH 101 in Manchester, NH I-93/Everett Turnpike in Hooksett, NH 02008-01-012008 current
4.60 7.40 I-93 in Concord, NH NH 9 in Pembroke, NH 01979-01-011979 current
53.42 85.97 I-80/I-94 in South Holland, IL I-94 in Deerfield, IL 01968-01-011968 current
3.38 5.44 I-94 in Battle Creek, MI M-66 in Battle Creek, MI 01961-01-011961 current
9.75 15.69 I-494/US 12 in Minnetonka, MN 4th Street in Minneapolis, MN 01991-01-011991 current
42.94 69.11 I-94/I-694 in Maple Grove, MN I-94/I-694 in Woodbury, MN 01985-01-011985 current Western and southern half of the Minneapolis-St. Paul beltway
22.62 36.40 I-94/I-494 in Maple Grove, MN I-94/I-494 in Woodbury, MN 01970-01-011970 current Northern and eastern half of the Minneapolis-St. Paul beltway
1.20 1.93 McKenzie Drive near Bismarck, ND I-94 near Mandan, ND -- -- Unsigned
3.75 6.04 I-43/I-94 in Milwaukee, WI WIS 794 in Milwaukee, WI 01980-01-011980 current
4.70 7.56 I-41/I-94 in Milwaukee, WI I-41/I-43/I-94 in Milwaukee, WI 01966-01-011966 current Completely concurrent with I-41
54.69 88.02 I-95 in East Lyme, CT I-290 in Auburn, MA 01983-01-011983 current
82.61 132.95 I-95/I-495 in New Castle, DE I-95 in Lower Makeield Township, PA 01994-01-011994 current Extended into Pennsylvania in 2018
11.47 18.46 I-95/I-295 in Newport, DE I-95 in Lower Chichester Township, PA 01977-01-011977 current
-- -- -- -- 01979-01-011979 01980-01-011980 Now part of I-95
13.39 21.55 I-95/I-495 in Springfield, VA US 50 in Washington, DC 01977-01-011977 current Original route of I-95 that was proposed to continue through Washington, DC
31.41 50.55 Beltway around Washington, DC 01961-01-011961 current Capital Beltway; runs through Virginia, Maryland and a small sliver of Washington, DC, over the Wilson Bridge
2.00 3.22 I-395 in Washington, DC I-295 in Washington, DC[16] 01958-01-011958 current
4.42 7.11 I-95/SR 112 in Miami, FL SR 905 in Miami Beach, FL 01961-01-011961 current
61.04 98.23 Beltway around Jacksonville, FL 01970-01-011970 current
1.29 2.08 I-95 in Miami, FL MacArthur Causeway at Watson Island, Miami, FL 01971-01-011971 current
12.86 20.70 I-75/SR 869 in Weston, FL US 1 in Fort Lauderdale, FL 01990-01-011990 current
-- -- I-95 south of Jacksonville, FL I-295 in Jacksonville, FL proposed -- Currently under construction; partially open as SR 9B but not yet signed as I-795
1.55 2.49 I-95/Maine Turnpike in Saco, ME SR 5 in Saco, ME 01980-01-011980 current
53.11 85.47 I-95/Maine Turnpike in Scarborough, ME I-95/Maine Turnpike in Gardiner, ME 01960-01-011960 current
4.99 8.03 I-95/US 2/SR 100 in Bangor, ME US 1A in Brewer, ME 02008-01-012008 current
3.70 5.95 I-95/Maine Turnpike in Portland, ME I-295/US 1 in Falmouth, ME 02004-01-012004 current Unsigned
4.71[17] 7.58 I-95/MD 166 near Catonsville, MD Baltimore-Washington International Airport 01990-01-011990 current
1.98 3.19 I-95 in South Baltimore, MD West Pratt Street in Baltimore, MD 01981-01-011981 current
19.97 32.14 I-95/I-495/US 50 near Washington, DC US 50/US 301/MD 70 in Annapolis, MD 02011-01-012011 current Unsigned designation for US 50
30.57 49.20 Beltway around Baltimore, MD 01958-01-011958 current
8.99 14.47 I-695 in Pikesville, MD MD 140 in Reisterstown, MD 01985-01-011985 current
11.44 18.41 I-95 near Elkridge, MD I-95 in Baltimore, MD 01979-01-011979 current
8.05 12.96 I-95/I-495 near Forest Heights, MD I-695 in Washington, DC 01964-01-011964 current
44.55 71.70 I-95 in Providence, RI I-495/Route 25 in Wareham, MA 01958-01-011958 current
26.58 42.78 I-95 in Warwick, RI I-95 in Attleboro, MA 01969-01-011969 current
121.56 195.63 I-195/Route 25 in Wareham, MA I-95 in Salisbury, MA 01957-01-011957 current
-- -- I-93 in Roxbury, MA I-93 in Charlestown, MA 01955-01-011955 01971-01-011971 Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
-- -- Route 37/I-295 in Cranston, RI I-95/I-295 in Attleboro, MA 01968-01-011968 01982-01-011982 Cancelled; would have supplemented I-295 to create a full Beltway around Providence, RI
34.17 54.99 I-295 in Hamilton Township, NJ Route 34 in Wall Township, NJ 01968-01-011968 current
-- -- I-295 in Burlington, NJ I-95 in Bristol, PA 01963-01-011963 01981-01-011981 Never built
7.70 12.39 NY 25/NY 24 in Queens, NY Bruckner Interchange in Bronx, NY 01970-01-011970 current
66.38 106.83 Queens Midtown Tunnel in Manhattan, NY CR 58 in Riverhead, NY 01958-01-011958 current
1.40 2.25 I-95 in Bronx, NY I-295 in Bronx, NY 01986-01-011986 current
1.12 1.80 I-278 in Bronx, NY I-95 in Bronx, NY 01970-01-011970 02017-01-012017[18] Currently designated as NY 895
-- -- -- -- proposed -- Planned route around the west side of Fayetteville, NC
4.10 6.60 I-440/US 64/US 64 Bus. in Raleigh, NC I-540/US 64/US 264 in Knightdale, NC 02013-01-012013 02017-01-012017 Now part of I-87
25.46 40.97 US 70/US 117 in Goldsboro, NC I-95/US 264 in Wilson, NC 02007-01-012007 current
-- -- I-95 near Philadelphia International Airport I-95 in Philadelphia, PA 01964-01-011964 01977-01-011977 Never built
3.24 5.21 SR 195 in Richmond, VA I-64/I-95 in Richmond, VA 01970-01-011970 current
52.56 84.59 I-95 near Petersburg, VA I-64 near Short Pump, VA 01980-01-011980 current
-- -- I-395 near Arlington, VA US 1 at Ronald Reagan Washington National Airport -- -- Now part of US 1
-- -- I-95 near Richmond, VA I-295 near Richmond, VA 01996-01-011996 02002-01-012002 Currently designated as SR 895, it was originally planned as a Interstate designation, but did not get approved by AASHTO
-- -- -- -- 01956-01-011956 01958-01-011958 Early number of I-476
37.07[11] 59.66 US 31 in Norton Shores, MI I-96/US 16 in Grand Rapids, MI 01959-01-011959 01963-01-011963 Now the western end of I-96
80.65 129.79 I-94/US 31 near Benton Harbor, MI I-96/M-37 in Grand Rapids, MI 01963-01-011963 current
3.43 5.52 I-196 in Grand Rapids, MI I-96/M-37 in Walker, MI 01962-01-011962 current Unsigned since 1979
11.78 18.96 I-69/I-96 near Lansing, MI I-96 and US 127 near Lansing, MI 01970-01-011970 current
29.39 47.30 I-96/I-275 & M-5 in Novi, MI I-94 in Roseville, MI 01989-01-011989 current
3.44 5.54 -- -- -- -- Replaced by I-595.
-- -- -- -- -- 01987-01-011987 Withdrawn from request, replaced by MD Route 3.
  •       Former
  •       Future

See also

Notes

  1. ^ According to the FHWA, I-275 in Michigan is only 29.97 mi (48.23 km) because they do not count the length overlapping I-96.[3] MDOT and most major map publishers do count the overlap.[11][12][13]

References

  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 2012. 
  2. ^ a b c DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved 2008. 
  3. ^ a b Adderly, Kevin (December 31, 2015). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved 2016. 
  4. ^ Special Committee on U.S. Route Numbering (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. Archived (PDF) from the original on October 16, 2017. 
  5. ^ Warring, KS (January 2, 2008). "Interstate 905 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. Sacramento: California Department of Transportation. Retrieved 2009. 
  6. ^ Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota. 
  7. ^ Tennessee Department of Transportation (October 31, 2003). "TDOT Announces Decision on State Route 840 North" (PDF) (Press release). Tennessee Department of Transportation. Archived from the original (PDF) on November 27, 2007. Retrieved 2007. 
  8. ^ Federal Highway Administration (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 2007. 
  9. ^ Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF) (Letter). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Retrieved 2015 – via American Association of State Highway and Transportation Officials. 
  10. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved 2012. 
  11. ^ a b c Michigan Department of Transportation & Michigan Center for Shared Solutions and Technology Partnerships (2009). MDOT Physical Reference Finder Application (Map). Michigan Department of Transportation. Retrieved 2016. 
  12. ^ Rand McNally (2008). "Michigan: Cities" (Map). The Road Atlas. 1 in?5 mi. Chicago: Rand McNally. p. 52. Detroit & Vicinity inset. § I3. ISBN 0-528-93981-5. OCLC 226315010. 
  13. ^ Google (February 24, 2010). "Overview Map of I-275" (Map). Google Maps. Google. Retrieved 2010. 
  14. ^ "State Seeking Future Interstate Designation for US 264 to Greenville". North Carolina Governor's Office (Press release). Retrieved 2016. 
  15. ^ [1]
  16. ^ DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post. 
  17. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved 2012. 
  18. ^ Special Committee on U.S. Route Numbering (September 24, 2017). "Special Committee on U.S. Route Numbering" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 4. Retrieved 2017. 

External links


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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