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List of auxiliary Interstate Highways

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Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System. The 323 auxiliary routes generally fall into three types: spur routes, which connect to or intersect the parent route at one end; bypasses, which connect to the parent route at both ends; and beltways, which form a circle that intersects the parent route at two locations. Some routes connect to the parent route at one end but to another route at the other end; some states treat these as spurs while others treat them as bypasses. Like the primary Interstate Highways, auxiliary highways meet Interstate Highway standards (with rare exceptions).

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
FormedJune 29, 1956[1]
Highway names
InterstatesInterstate X (I-X)
System links

The shorter auxiliary routes branch from primary routes; their numbers are based on the parent route's number. All of the supplement routes for Interstate 95 (I-95) are designated with a three-digit number ending in "95": I-x95. With some exceptions, 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 can repeat from state to state along their route, but they will not repeat within a state.

There are three states that have no auxiliary Interstate Highways: Alaska, Arizona, and New Mexico. North Dakota has an auxiliary route, but it is unsigned, and Wyoming's does not meet Interstate Highway standards.

Terminology and guidelines

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

Auxiliary Interstates are divided into three types: spur, loop, and bypass routes.

The first digit of the three digits usually signifies whether a route is a bypass, spur, or beltway. The last two digits are derived from the main Interstate Highway. For instance, I-115 contains an odd number in the first digit (1), which indicates that this freeway is a spur. The last two digits signify the highway's origin. In this case, the "15" in I-115 shows that it is a supplement to I-15.

Exceptions to the standard numbering guidelines exist 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

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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-185 in Columbus, Georgia.
  • It may represent the first portion of a contemplated extended freeway that does not currently meet Interstate Standards but it may be upgraded later on. An example is I-369 in Texas, which currently does not connect with parent route I-69.
  • It may connect two unrelated Interstate highways, like I-390 in New York State and I-355 in Illinois.
    • States differ on their interpretation of the numbering convention when an Interstate behaves in this case In the I-390 example above, the route is assigned odd first digit. The I-275 in Tennessee, a connector between I-40 and I-75, is assigned an even first digit.
    • This may even vary within the same state. For example, in Michigan, both I-196 and I-696 intersect I-96 at one end and I-94 at the other end.

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

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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

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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 (and by extension, all primary 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

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Note: this 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
  H-201 4.10 6.60 H-1 in Halawa, HI H-1 in Honolulu, HI 02004-01-012004[4] current Signed as Route 78 until 2004
  I-105 17.32 27.87 SR 1 in El Segundo, CA I-605 in Norwalk, CA 01963-01-011963 current Replaced segments of SR 42
  I-205 12.97 20.87 I-580 near Tracy, CA I-5 near Tracy, CA 01970-01-011970 current
  I-305 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
  I-405 72.15 116.11 I-5 in Irvine, CA I-5 in Mission Hills, CA 01964-01-011964 current
  I-505 32.98 53.08 I-80 in Vacaville, CA I-5 in Dunnigan, CA 01977-01-011977 current Originally part of I-5W
  I-605 27.40 44.10 I-405 in Seal Beach, CA I-210 in Irwindale, CA 01964-01-011964 current
  I-805 28.02 45.09 I-5 in San Ysidro, CA I-5 in Sorrento Valley, CA 01959-01-011959 current
  I-905 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
  I-105 3.49 5.62 OR 99 in Eugene, OR I-5 in Springfield, OR 01958-01-011958 current
  I-305 — — Pine Street in Salem, OR I-5 in Keizer, OR 01957-01-011957 01976-01-011976 Canceled
  I-405 3.53 5.68 I-5 in Portland, OR I-5 in Portland, OR 01958-01-011958 current
  I-505 3.17 5.10 US 30 in Portland, OR I-405 in Portland, OR 01969-01-011969 01979-01-011979 Canceled
  I-205 36.64 58.97 I-5 in Tualatin, OR I-5 in Salmon Creek, WA 01958-01-011958 current
  I-405 30.30 48.76 I-5/SR 518 in Tukwila, WA I-5/SR 525 in Lynnwood, WA 01957-01-011957 current
  I-605 — — WA 99 in Federal Way, WA I-5 in Everett, WA — — Never built, was planned to bypass Seattle, WA
  I-705 1.50 2.41 I-5/SR 7 in Tacoma, WA Schuster Parkway in Tacoma 01978-01-011978 current
  I-210 4.9 7.9 I-10 in Mobile, AL I-65 in Prichard, AL — — Currently I-165, the route number was decommissioned because it had no connection to I-10
  I-410 — — I-10/I-17 in Phoenix, AZ I-10 in Phoenix, AZ — — Now part of I-10 in Phoenix, AZ
  I-510 — — I-10/SR 51 in Phoenix, AZ SR 101 in Phoenix, AZ — — Currently designated as SR 51 (Piestewa Freeway)
  I-710 — — 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
  I-110 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 6, then signed as SR 11
  I-210 48.72 78.41 I-5 in Sylmar, CA SR 57/SR 210 in Glendora, CA 01964-01-011964 current Does not connect physically with I-10 as segment from SR 57 east to I-10 is still signed as SR 210, formerly SR 30 prior to 2007.
  I-710 19.66 31.64 Terminal Island in Long Beach, CA Valley Boulevard in Alhambra, CA 01983-01-011983 current Originally signed as SR 7
  I-110 6.94 11.17 US 98 Bus. near Pensacola, FL I-10 near Pensacola, FL 01969-01-011969 current
  I-110 8.89 14.31 I-10 in Baton Rouge, LA US 61 in Baton Rouge, LA 01964-01-011964 current
  I-210 12.40 19.96 I-10 west of Lake Charles, LA I-10 east of Lake Charles, LA 01964-01-011964 current
  I-310 11.25 18.11 US 90/LA 3127 in Boutte, LA I-10 west of Kenner, LA 01983-01-011983 current
  I-310 2.70 4.35 US 90 Bus. in New Orleans, LA I-10 in New Orleans, LA 01964-01-011964 01969-01-011969 Canceled Vieux Carré Riverfront Expressway
  I-410 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-410 48.5 78.1 I-10 west of New Orleans, LA I-10 in New Orleans, LA 01969-01-011969 01977-01-011977 Canceled southern bypass of New Orleans; completed portions became I-310 and I-510
  I-510 3.04 4.89 LA 47 in New Orleans, LA I-10/LA 47 in New Orleans, LA 01992-01-011992 current
  I-610 4.52 7.27 I-10 at Metairie–New Orleans, LA line I-10 in New Orleans, LA 01965-01-011965 current
  I-910 9.70 15.61 US 90 Bus. in Marrero, LA I-10/US 90 Bus. in New Orleans, LA 01999-01-011999 current Unsigned; completely concurrent with US 90 Bus.; both designation are temporary placeholders for Future I-49
  I-110 4.10 6.60 US 90 in Biloxi, MS I-10 in D'Iberville, MS 01988-01-011988 current
  I-310 — — US 90 near the Port of Gulfport, MS I-10 in Gulfport, MS proposed — Future spur into Gulfport, MS
  I-110 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
  I-410 49.49 79.65 Beltway around San Antonio, TX 01959-01-011959 current
  I-610 37.97 61.11 Beltway around Houston, TX 01975-01-011975 current
  I-215 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
  I-115 1.19 1.92 I-15/I-90 in Butte, MT Iron Street in Butte, MT 01971-01-011971 current
  I-315 0.83 1.34 I-15 in Great Falls, MT I-15 Bus/US 89 in Great Falls, MT 01960-11-211960 current Unsigned
  I-215 11.10 17.86 I-15/Clark County Route 215 in Enterprise, NV I-11/US 93/SR 564 in Henderson, NV 01996-01-011996 current
  I-515 20.54 33.06 US 93/US 95 in Henderson, NV I-15/US 93/US 95 in Las Vegas, NV 01976-01-011976 02024-01-012024 Not signed until 1994, this route is entirely concurrent with US 93/US 95; replaced by northward extensions of I-11 in 2017 and 2024
  I-215 29.02 46.70 I-80 in Salt Lake City, UT I-15 in North Salt Lake, UT 01963-01-011963 current
  I-415 2.39 3.85 I-80 in Salt Lake City, UT 4430 S in Holladay, UT 01965-01-011965 01969-01-011969 Designation was scrapped to provide a single route number 215 for the entire route.
  I-516 6.49 10.44 SR 21/SR 204 in Savannah, GA SR 21 in Garden City, GA 01985-01-011985 current
  I-420 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
  I-520 23.34 37.56 I-20 in Augusta, GA I-20 in North Augusta, SC 01980-01-011980 current
  I-220 17.62 28.36 I-20/LA 3132 in Shreveport, LA I-20 in Bossier City, LA 01979-01-011979 current
  I-420 10.20 16.42 I-20 in West Monroe, LA I-20 in Monroe, LA 01957-01-011957 01964-01-011964 Canceled bypass of Monroe
  I-220 12.01 19.33 I-20 in Jackson, MS I-55 in Ridgeland, MS 01981-01-011981 current
  I-820 35.17 56.60 I-20 in Fort Worth, TX I-20/US 287 in Fort Worth, TX 01959-01-011959 current
  I-222 — — I-22 in Graysville, AL I-422 in Brookside, AL proposed — Proposed connector between I-422 and I-22 due to the inability to make a direct connection between the two routes.
  I-422 — — I-20/I-59/I-459/US 11 in Bessemer, AL I-59 in Argo, AL proposed — Currently under construction; will only be indirectly connected to I-22 via I-222.
  I-124 1.97 3.17 I-24 in Chattanooga, TN US 27 in Chattanooga, TN 01960-01-011960 current Unsigned
  I-225 12.00 19.31 I-25 in Denver, CO I-70 in Aurora, CO 01976-01-011976 current
  I-425 5.31 8.55 I-25/US 36 at Welby, CO I-70/US 36 at Denver, CO — 01959-01-011959 Renumbered as I-270 by AASHTO
  I-126 3.68 5.92 I-26 in Columbia, SC US 21/US 76/US 176/US 321 in Columbia, SC 01961-01-011961 current
  I-326 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
  I-526 19.26 31.00 US 17 in Charleston, SC I-526 Bus./US 17 in Mount Pleasant, SC 01989-01-011989 current
  I-129 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
  I-229 14.97 24.09 I-29 in St. Joseph, MO I-29/US 59/US 71 in St. Joseph, MO 01986-01-011986 current
  I-229 11.33 18.23 I-29 in Sioux Falls, SD I-90 near Sioux Falls, SD 01966-01-011966 current
  I-130 5 8.0 I-30 in Texarkana, AR US 71 in Texarkana, AR 02000-01-012000 02014-01-012014 Was given a future designation during its existence due to not being upgraded to Interstate Highway standards; freeway became part of I-49 once completed
  I-430 12.93 20.81 I-30/US 67/US 70 in Little Rock, AR I-40/US 65 in North Little Rock, AR 01980-01-011980 current
  I-530 46.65 75.08 US 63/US 65/US 425/US 79/US 65B/AR 190 in Pine Bluff, AR I-30/US 65/US 67/US 167/I-440 in Little Rock, AR 01999-01-011999 current
  I-630 7.40 11.91 I-430 in Little Rock, AR I-30/US 65/US 67/US 167 in Little Rock, AR 01985-01-011985 current
  I-235 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
  I-135 95.74 154.08 Kansas Turnpike/I-35 in Wichita, KS I-70/US 81 in Salina, KS 01976-01-011976 current
  I-235 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
  I-335 50.13 80.68 I-35/Kansas Turnpike/US 50 in Emporia, KS I-470/Kansas Turnpike in Topeka, KS 01987-01-011987 current
  I-435 80.81 130.05 Beltway around Kansas City, KS, and Kansas City, MO 01965-01-011965 current
  I-635 8.90 14.32 I-35 in Overland Park, KS I-29/US 71 in Kansas City, MO 01968-01-011968 current
  I-335 2.74[6] 4.41 I-94 in Minneapolis, MN I-35W in Minneapolis, MN 01964-01-011964 01978-01-011978 Canceled
  I-535 2.78 4.47 I-35/US 53 in Duluth, MN US 53/WIS 35 in Superior, WI 01971-01-011971 current
  I-235 5.36 8.63 I-35/I-40 in Oklahoma City, OK I-44 in Oklahoma City, OK 01989-01-011989 current
  I-335 19.6 31.5 SE 89th Street in Oklahoma City, OK I-44 in Luther, OK 02024-01-012024 current Routed along the Kickapoo Turnpike[7]
  I-635 37.00 59.55 SH 121 in Grapevine, TX I-20 in Balch Springs, TX 01959-01-011959 current
  I-440 14.16 22.79 I-30/US 65/US 67/US 167/I-530 in Little Rock, AR I-57/US 67/US 167 in Jacksonville 02003-01-012003 current
  I-540 15.87 25.54 US 271/SH-9 at the Oklahoma state line I-40/US 71 in Van Buren, AR 01965-01-011965 current
  I-140 25.4 40.9 US 17 near Winnabow, NC I-40/US 17 in Wilmington, NC 02008-01-012008 current
  I-240 9.54 15.35 I-26/I-40/US 74 near Asheville, NC I-40/US 74A in Asheville, NC 01980-01-011980 current
  I-440 16.77 26.99 I-40/US 1/US 64 near Cary, NC I-40 near Raleigh, NC 01991-01-011991 current
  I-540 25.84 41.59 I-40 near Durham, NC I-87/US 64/US 264 near Knightdale, NC 01997-01-011997 current
  I-840 21.9 35.2 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
  I-240 16.22 26.10 I-44/US 62 in Oklahoma City, OK I-40/US 270 in Oklahoma City, OK 01965-01-011965 current
  I-440 9.96 16.03 I-40/I-240 near Oklahoma City, OK I-35 in Oklahoma City, OK — 01975-01-011975 Now part of I-44
  I-140 11.17 17.98 I-40 near Farragut, TN US 129 near Alcoa, TN 01987-01-011987 current
  I-240 19.27 31.01 I-40 in Memphis, TN I-40 in Memphis, TN 01970-01-011970 current
  I-440 7.64 12.30 I-40 in Nashville, TN I-24 in Nashville, TN 01987-01-011987 current
  I-640 7.03 11.31 I-40 in Knoxville, TN I-40 in Knoxville, TN 01982-01-011982 current
  I-840 77.28[8] 124.37 I-40 near Dickson, TN I-40 near Lebanon, TN 02016-01-012016 current Originally designated SR 840 until completion
  I-244 20 32 I-270/I-55 in Mehlville, MO I-270/I-70 in Bridgeton, MO — — Redesginated as I-270 in the late-1970s for consistency along the St. Louis Beltway
  I-244 15.75 25.35 I-44 in Tulsa, OK I-44 in Tulsa, OK 01970-01-011970 current
  I-344 29.4 47.3 I-240 in Oklahoma City, OK I-35 and I-44/Turner Turnpike in Oklahoma City, OK 02024-01-012024 current Routed along the John Kilpatrick Turnpike[7]
  I-444 2.51 4.04 I-244 in Tulsa, OK I-244 in Tulsa, OK 01970-01-011970 current Unsigned
  I-345 1.40 2.25 I-30/I-45 in Dallas, TX US 75 in Dallas, TX 01973-01-011973 current Unsigned
  I-555 49.80 80.15 I-55/US 61/US 78/AR 77 in Turrell, AR US 63/AR 18/AR 91 in Jonesboro, AR 02016-01-012016 current
  I-155 32.13 51.71 I-55 in Lincoln, IL I-74 in Morton, IL 01992-01-011992 current
  I-255 30.82 49.60 I-55/I-270 in Mehlville, MO I-270/IL 255 in Pontoon Beach, IL 01986-01-011986 current
  I-355 32.51 52.32 I-80 in New Lenox, IL I-290 in Itasca, IL 01989-01-011989 current
  I-155 15.93 25.64 I-55 near Hayti, MO US 51 at Dyersburg, TN 01980-01-011980 current
  I-255 — — I-55/I-240 in Memphis, TN I-40 in Memphis, TN — — Now part of I-55 and I-240
  I-359 2.30 3.70 I-20/I-59 in southern Tuscaloosa, AL 15th Street in downtown Tuscaloosa, AL 01983-01-011983 current
  I-459 32.80 52.79 I-20/I-59 in Bessemer, AL I-59 in Trussville, AL 01984-01-011984 current
  I-759 4.50 7.24 I-59 in Attalla, AL US 411/SR 759 in Gadsden, AL 01986-01-011986 current
  I-164 21.39[9] 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[10]
  I-264 22.93 36.90 I-64 in Louisville, KY I-71 in Louisville, KY 01956-01-011956 current
  I-264 25.07 40.35 I-64/I-664 in Chesapeake, VA Parks Ave in Virginia Beach, VA 01960-01-011960 current
  I-464 4.71 7.58 I-64 in Chesapeake, VA I-264 in Norfolk, VA 01960-01-011960 current
  I-564 3.03 4.88 SR 337 I-64 in Norfolk, VA 01970-01-011970 current
  I-664 20.21 32.52 I-64/I-264 in Norfolk, VA I-64 in Hampton, VA 01971-01-011971 current
  I-165 4.90 7.89 US 43 in Mobile, AL I-65 in Mobile, AL 01994-01-011994 current
  I-565 21.40 34.44 I-65/US 72/SR 20 in Decatur, AL US 72 in Huntsville, AL 01991-01-011991 current
  I-265 2 3.2 I-40 in Nashville, TN I-65 in Nashville, TN — 02000-01-012000 Now part of I-65
  I-165 69.684 112.146 I-65 in Bowling Green, KY US 60/US 231 in Owensboro, KY 02019-01-012019 current Replaced the William H. Natcher Parkway; originally designated as I-66 Spur in 2008 followed by I-65 Spur in 2015
  I-365 88 142 I-65 near Park City, KY US 27 in Somerset, KY proposed — Future designation along the Cumberland Parkway
  I-165 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
  I-265 31.21 50.23 I-64/US 150/SR 62 in New Albany, IN I-65/I-265/KY 841 in Heritage Creek, KY 01977-01-011977 current Completed on December 18, 2016, with the completion of the East End Bridge that connected the Indiana segment to the Kentucky segment
  I-465 52.79 84.96 Beltway around Indianapolis 01970-01-011970 current
  I-865 4.72 7.60 I-65 near Indianapolis, IN I-465 near Indianapolis 02002-01-012002 current
 
  I-66 Spur 		69.684 112.146 I-65 in Bowling Green, KY US 60/US 231 in Owensboro, KY 02008-01-012008 02015-01-012015 Designation was to replace the William H. Natcher Parkway as part of the proposed I-66 Southern Kentucky Corridor; the route was redesignated as I-65 Spur (which became I-165) when the I-66 project was cancelled
  I-266 1.79 2.88 I-66 in Arlington, Virginia I-66 in Washington, D.C. — 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; canceled in the face of community opposition during Washington's freeway revolts
  I-169 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; currently unsigned pending upgrade to Interstate standards
  I-369 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
  I-569 38.446 61.873 I-69/I-169 in Nortonville, KY I-165 in Beaver Dam, KY proposed — Future designation for the western part of Western Kentucky Parkway once upgraded to Interstate standards
  I-269 45.19 72.73 I-55/I-69/MS 304 in Hernando, MS I-40/SR 385 in Arlington, TN 02015-01-012015 current Construction completed in October 2018; co-signed with SR 304 in Mississippi; extension to Millington, TN to connect with the proposed I-69 extension planned
  I-169 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
  I-469 30.83 49.62 I-69 in Fort Wayne, IN I-69 in Fort Wayne, IN 01995-01-011995 current
  I-169 1.50 2.41 Port of Brownsville in Brownsville, TX I-69E/US 77/US 83 in Olmito, TX 02015-01-012015 current Currently under construction; partially open and co-signed with SH 550
  I-369 3.50 5.63 I-30/US 59 in Texarkana, TX US 59/SH 93 in Texarkana, TX 02013-01-012013 current Partially completed in 2013
  I-270 5.31 8.55 I-25/US 36 at Welby, CO I-70/US 36 at Denver, CO 01965-01-011965 current
  I-470 — — Beltway around Denver Metro, CO — — Northwestern portion cancelled due to local opposition; completed segments are designated as SH 470 or E-470
  I-270 50.59 81.42 I-55/I-255 in Mehlville, MO I-55/I-70 near Troy, IL 01956-01-011956 current
  I-470 13.72 22.08 I-70 in Topeka, KS I-70/Kansas Turnpike in Topeka, KS 01960-01-011960 current
  I-670 2.81 4.52 I-70 in Kansas City, KS I-70 in Kansas City, MO 01968-01-011968 current
  I-170 2.30 3.70 I-70 in Baltimore, MD US 40 in Baltimore, MD 01969-01-011969 01983-01-011983 Canceled
  I-270 32.60 52.46 I-70 near Frederick, MD I-495 north of Bethesda, MD 01975-01-011975 current
   
  I-270 Spur 		2.10[11] 3.38 I-270 east of Potomac, MD I-495 northwest of Bethesda, MD 01975-01-011975 current Serves as an alternate connector for Virginia travelers
  I-370 2.54 4.09 I-270 in Gaithersburg, MD MD 200 in Derwood, MD 01988-01-011988 current
  I-170 11.17 17.98 I-64/US 40 in Richmond Heights, MO I-270 in Hazelwood, MO 01956-01-011956 current
  I-470 16.72 26.91 I-49/I-435 in Kansas City, MO I-70 in Independence, MO 01983-01-011983 current
  I-270 54.97 88.47 Beltway around Columbus, OH 01964-01-011964 current
  I-470 6.69 10.77 I-70 near Blaine, OH I-70 in Elm Grove, WV 01976-01-011976 current
  I-670 9.37 15.08 I-70 in Columbus, OH I-270 near John Glenn Columbus International Airport 02003-01-012003 current
  I-271 46.06 74.13 I-71 near Medina, OH I-90 in Willoughby Hills, OH 01964-01-011964 current
  I-471 5.75 9.25 I-275 near Newport, KY I-71 in Cincinnati, OH 01981-01-011981 current
  I-172 19.69 31.69 I-72 in Quincy, IL US 24 in Quincy, IL 01995-01-011995 current
  I-474 14.88 23.95 I-74 in Peoria, IL I-74 in Morton, IL 01973-01-011973 current
  I-274 16.83 27.09 US 158 near Clemmons, NC Future I-74/Future I-285/US 52 in Bethania, NC proposed — Proposed route in Winston-Salem, NC
  I-175 1.44 2.32 I-275 in St. Petersburg, FL SR 687 in St. Petersburg, FL 01980-01-011980 current
  I-275 60.64 97.59 I-75 near Memphis, FL I-75 in Wesley Chapel, FL 01973-01-011973 current
  I-375 1.34 2.16 I-275 in St. Petersburg, FL US 92 in St. Petersburg, FL 01979-01-011979 current
  I-175 — — US 82 in Albany, GA I-75 in Cordele, GA — — Now part of SR 300
  I-475 15.83 25.48 I-75 in Macon, GA I-75 in Macon, GA 01965-01-011965 current
  I-575 30.97 49.84 I-75 in Kennesaw, GA SR 5 west of Nelson, GA 01985-01-011985 current
  I-675 11.04 17.77 I-75 in Stockbridge, GA I-285 southeast of Atlanta, GA 01987-01-011987 current
  I-275 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
  I-275 35.01[12][a] 56.34 I-75 near Monroe, MI I-96, I-696 and M-5 in Farmington Hills, MI 01977-01-011977 current
  I-375 1.06 1.71 BS I-375 in Detroit, MI I-75 in Detroit, MI 01964-01-011964 current Will be downgraded to a boulevard starting in 2025
  I-475 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
  I-675 7.72 12.42 I-75/US 23 near Saginaw, MI I-75/US 23 near Zilwaukee, MI 01971-01-011971 current
  I-475 20.37 32.78 I-75 in Perrysburg, OH I-75 in Toledo, OH 01964-01-011964 current
  I-675 26.53 42.70 I-75 near Miamisburg, OH I-70 near Medway, OH 01987-01-011987 current
  I-175 — — I-75 in Chattanooga, TN I-75 in Lexington, KY — —
  I-275 2.98 4.80 I-40 in Knoxville, TN I-75/I-640 in Knoxville, TN 01982-01-011982 current
  I-475 — — I-40/I-75 near Knoxville, TN I-75 near Knoxville, TN 01990-11-211990 — Canceled due to local opposition and high construction costs
  I-676 6.90 11.10 I-76/US 30 in Philadelphia, PA I-76 in Camden, NJ 01991-01-011991 current
  I-176 11.33 18.23 I-76/Pennsylvania Turnpike in Morgantown, PA US 422 near Reading, PA 01964-01-011964 current
  I-276 29.78 47.93 I-76 in King of Prussia, PA I-95/I-295 in Bristol Township, PA 01964-01-011964 current
  I-376 84.42 135.86 I-80 near Hermitage, PA I-76/US 22 in Monroeville, PA 01972-01-011972 current
  I-476 129.61 208.59 I-95 near Chester, PA I-81/US 6/US 11 near Clarks Summit, PA 01992-01-011992 current
  I-876 1.57 2.53 PA 885 in Pittsburgh, PA I-279/PA 28 in Pittsburgh, PA 01970-01-011970 01971-01-011971 Short lived renumbering of I-479, now I-579
  I-277 4.46 7.18 I-77/US 21/US 74/NC 27 in Charlotte, NC I-77/US 21/NC 16 in Charlotte, NC 01981-01-011981 current Partial loop around Uptown Charlotte
  I-277 4.14 6.66 I-76 in Akron, OH I-77 in Akron, OH 01970-01-011970 current
  I-178 — — — — — 01971-01-011971 Canceled
  I-378 — — — — 01968-01-011968 01971-01-011971 Replaced by PA Route 378
  I-278 35.62 57.32 US 1/9 in Linden, NJ Bruckner Interchange in Bronx, NY 01961-01-011961 current Does not intersect with parent route I-78
  I-478 2.14 3.44 I-278 in Brooklyn, NY NY 9A in Manhattan, NY 01971-01-011971 current Unsigned; does not intersect with parent route I-78
  I-678 14.33 23.06 John F. Kennedy International Airport in Queens, NY Bruckner Interchange in Bronx, NY 01965-01-011965 current Does not intersect with parent route I-78
  I-878 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; does not intersect with parent route I-78; eastbound only
  I-179 — — McKean Township, PA Erie, PA 01958-01-011958 01968-01-011968 Replaced by its parent route, I-79
  I-279 13.32 21.44 I-376/US 22/US 30 in Pittsburgh, PA I-79 in Franklin Park, PA 01972-01-011972 current
  I-479 1.57 2.53 PA 885 in Pittsburgh, PA I-279/PA 28 in Pittsburgh, PA 01966-01-011966 01970-01-011970 Early number for I-579
  I-579 1.57 2.53 PA 885 in Pittsburgh, PA I-279/PA 28 in Pittsburgh, PA 01971-01-011971 current
  I-180 — — 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
  I-280 57.22 92.09 I-680/US 101 in San Jose, CA King Street in San Francisco, CA 01964-01-011964 current
  I-238 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
  I-380 1.671 2.689 I-280 in San Bruno, CA US 101 in San Bruno, CA 01964-01-011964 current
  I-480 — — 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
  I-580 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
  I-680 70.52 113.49 I-280/US 101 in San Jose, CA I-80 in Cordelia, CA 01955-01-011955 current Originally SR 21
  I-780 6.50 10.46 I-80 in Vallejo, CA I-680 in Benicia, CA 01955-01-011955 current Originally part of I-680
  I-880 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-880 — — I-80 in West Sacramento, CA I-80 in Sacramento, CA 01971-01-011971 01983-01-011983 Now part of I-80
  I-980 2.03 3.27 I-880 in Oakland, CA I-580/SR 24 in Oakland, CA 01981-01-011981 current
  I-580 30.09 48.43 US 50 in Carson City, NV I-80 in Reno, NV 02012-01-012012 current Runs concurrently with US 395
  I-180 13.19 21.23 IL 26/IL 71 in Hennepin, IL I-80 near Princeton, IL 01969-01-011969 current
  I-280 26.98 43.42 I-80 near Davenport, IA I-74/I-80 near Colona, IL 01990-01-011990 current
  I-380 73.05 117.56 I-80 near Iowa City, IA US 218 in Waterloo, IA 01985-01-011985 current Connects Waterloo and Cedar Rapids, IA, with I-80
  I-480 4.90 7.89 I-80/US 75 in Omaha, NE I-29/US 6 in Council Bluffs, IA 01966-01-011966 current
  I-680 16.49 26.54 I-80 in Omaha, NE I-29 near Crescent, IA 01966-01-011966 current
  I-880 16.57 26.67 I-29 near Loveland, IA I-80 near Neola, IA 02019-01-012019 current Former section of I-680
  I-180 3.18 5.12 US 34 in Lincoln, NE I-80/US 34/US 77 in Lincoln, NE 01965-01-011965 current
  I-280 — — I-80 in Omaha, NE I-29 near Crescent, IA 01958-01-011958 01965-01-011965 Redesignated as I-680 due to the I-280 already being planned in the Davenport, Iowa area
  I-580 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 due to the I-480 interchange not being up to interstate standards
  I-280 17.85 28.73 I-80 in Parsippany-Troy Hills, NJ I-95/New Jersey Turnpike in Kearny, NJ 01958-01-011958 current
  I-280 12.41 19.97 I-80/I-90/Ohio Turnpike in Lake Township, OH I-75 in Toledo, OH 01959-01-011959 current
  I-380 — — I-76/I-77 in Akron, OH I-271 in Macedonia, OH proposed — Proposed designation for SR 8 between Akron and Macedonia
  I-480 41.77 67.22 I-80/Ohio Turnpike in North Ridgeville, OH I-80/Ohio Turnpike in Streetsboro, OH 01971-01-011971 current
  I-680 16.43 26.44 I-76/Ohio Turnpike in North Lima, OH I-80/SR 11 near Mineral Ridge, OH 01964-01-011964 current
  I-180 28.85 46.43 US 15/US 220 in Williamsport, PA I-80/PA 147 near Milton, PA 01984-01-011984 current
  I-180 — — — — — 01964-01-011964 Original number for I-176 when I-76 was I-80S
  I-280 — — — — 01958-01-011958 01964-01-011964 Now part of Pennsylvania Turnpike
  I-380 24.76 39.85 I-80 in Tunkhannock Township, PA I-81/I-84/US 6 in Dunmore, PA 01973-01-011973 current
  I-480 — — — — 01958-01-011958 01964-01-011964 Early number for I-476 when I-76 was I-80S
  I-680 — — — — 01958-01-011958 01964-01-011964 Original number for I-676 when I-76 was I-80S
  I-180 1.09 1.75 I-80 in Cheyenne, WY I-80 Bus./US 30 in Cheyenne, WY 01984-01-011984 current Built as a boulevard, not to Interstate Highway standards
  I-281 9.45 15.21 I-81 in Onondaga, NY New York State Thruway (I-90) in DeWitt, NY — 01970-01-011970 Redesignated as I-481 on January 1, 1970
  I-481 15.04 24.20 I-81 in Onondaga, NY I-81/NY 481 in North Syracuse, NY 01970-01-011970 current Will be decommissioned when I-81 is rerouted onto the freeway and the original I-81 routing becomes I-81 Business
  I-781 4.30 6.92 I-81 in Pamelia, NY Fort Drum main gate in Le Ray, NY 02012-01-012012 current
  I-381 1.67 2.69 SR 381 in Bristol, VA I-81 in Bristol, VA 01961-01-011961 current
  I-581 6.64 10.69 US 220/SR 24 in Roanoke, VA I-81 near Hollins, VA 01955-01-011955 current
  I-181 23.85 38.38 US 321/SR 67 in Johnson City, TN US 11W/SR 1 in Kingsport, TN 01985-01-011985 02007-01-012007 Now part of I-26
  I-182 15.19 24.45 I-82/US 12 near Richland, WA US 12/US 395 in Pasco, WA 01969-01-011969 current Completely concurrent with US 12
  I-283 2.91 4.68 I-76/Pennsylvania Turnpike near Highspire, PA I-83/US 322/Capital Beltway near Harrisburg, PA 01972-01-011972 current
  I-184 3.62 5.83 I-84 in Boise, ID US 20/US 26 in Boise, ID 01990-01-011990 current
  I-384 8.20 13.20 I-84/US 6 in East Hartford, CT US 6/US 44 in Bolton, CT 01984-01-011984 current
  I-684 28.47 45.82 I-287 near White Plains, NY NY 22 near Brewster, NY 01974-01-011974 current Original routing of I-87; also crosses into Connecticut
  I-685 14.00 22.53 I-65 in downtown Montgomery, AL I-85 in Montgomery, AL proposed — Future designation for I-85 in Montogomery once the Montgomery Outer Loop is completed and I-85 is routed onto it
  I-185 49.30 79.34 US 27/US 280/SR 520 in Columbus, GA I-85 near LaGrange, GA 01979-01-011979 current
  I-285 63.98 102.97 Beltway around Atlanta, GA 01969-01-011969 current
  I-485 5.9 9.5 I-75/I-85 in Atlanta, GA I-85 in Atlanta, GA 01964-01-011964 01975-01-011975 Completed section now the Freedom Parkway, was planned to relieve traffic along Downtown Connector (I-75/85) through downtown Atlanta
  I-985 24.04 38.69 I-85 near Buford, GA SR 369 near Gainesville, GA 01985-01-011985 current
  I-285 22.8 36.7 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 02018-01-012018 current An unconfirmed section of Future I-285 is to continue north of I-40 for 10 miles (16 km) along US 52, through downtown Winston-Salem, to the proposed Winston-Salem Northern Beltway.[15][16]
  I-485 66.68 107.31 Beltway around Charlotte, NC 01988-01-011988 current
  I-685 — — Greensboro, NC Dunn, NC proposed — Future designation that will run concurrently with US 421 once the latter route is upgraded to interstate standards
  I-785 7.00 11.27 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
  I-885 8.566 13.786 I-40/NC 885 in Research Triangle Park, NC I-85/US 70/US 15 in Durham, NC 02022-01-012022 current
  I-185 17.70 28.49 I-385 near Mauldin, SC US 29 in Greenville, SC 01955-01-011955 current
  I-385 42.16 67.85 I-26 near Clinton, SC US 276 in Greenville, SC 01962-01-011962 current
  I-585 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 Does not connect to I-85
  I-587 55.9 90.0 I-87/US 64 near Zebulon, NC US 264 near Greenville, NC 02022-01-012022[17] current Former section of US 264; does not currently connect to I-87
  I-287 98.72 158.87 I-95/New Jersey Turnpike/Route 440 in Edison, NJ I-95 in Rye, NY 01961-01-011961 current
  I-187 — — I-287/New York State Thruway in Greenburgh, NY I-95 in Rye, NY 01957-01-011957 01958-01-011958 Original designation for the Cross-Westchester Expressway; it was signed as I-487 when it opened
  I-487 — — I-287/New York State Thruway in Greenburgh, NY I-95 in Rye, NY 01958-01-011958 01961-01-011961 Original signed designation for the Cross-Westchester Expressway; it was replaced by an extension of I-287
  I-487 — — I-87/I-287/New York State Thruway in Tarrytown, NY I-84 in Beacon, NY 01965-01-011965 01971-01-011971 Known as the Hudson River Expressway; the project was cancelled and the only portion to be constructed and opened is now the Croton Expressway
  I-587 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
  I-687 9.10 14.65 I-90/New York State Thruway in Colonie, NY I-90 in Albany — 01973-01-011973 Also known as the Albany Airport Connector; the project was cancelled in the face of local opposition
  I-787 10.16 16.35 I-87/New York State Thruway in Albany, NY NY 7 in Green Island, NY 01968-01-011968 current
  I-189 1.49 2.40 US 7 in South Burlington, VT I-89 in South Burlington, VT 01980-01-011980 current
  I-190 3.07 4.94 O'Hare International Airport in Chicago, IL I-90 in Chicago, IL 01978-01-011978 current
  I-290 29.84 48.02 I-90/IL 53 in Rolling Meadows, IL I-90/I-94/Ida B. Wells Drive in Chicago, IL 01972-01-011972 current
  I-490 — — I-294 in Franklin Park, IL I-90 in Des Plaines, IL proposed — Proposed route number for the O'Hare West Bypass[18]
  I-190 19.26 31.00 I-290 in Worcester, MA Route 2 in Leominster, MA 01983-01-011983 current
  I-290 20.16 32.44 I-395 in Auburn, MA I-495 in Marlborough, MA 01970-01-011970 current
  I-190 28.34 45.61 I-90/New York State Thruway in Cheektowaga, NY Highway 405 at Lewiston, NY 01959-01-011959 current
  I-290 9.80 15.77 I-190 in Tonawanda, NY I-90/New York State Thruway in Williamsville, NY 01964-01-011964 current
  I-390 76.06 122.41 I-86/NY 17 in Avoca, NY I-490 in Gates, NY 01973-01-011973 current
  I-490 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
  I-590 5.31 8.55 I-390 in Brighton, NY I-490/NY 590 in Rochester, NY 01980-01-011980 current
  I-690 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
  I-790 2.41 3.88 I-90/New York State Thruway in Deerfield, NY NY 5A/NY 55 in Utica, NY 01961-01-011961 current
  I-890 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
  I-990 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
  I-490 2.43 3.91 I-71/I-90 in Cleveland, OH East 55th Street in Cleveland, OH 01990-01-011990 current
  I-190 1.72 2.77 I-90 in Rapid City, SD US 16 in Rapid City, SD 01962-01-011962 current
  I-291 6.02 9.69 I-91 in Windsor, CT I-84 in Manchester, CT 01994-01-011994 current
  I-691 8.38 13.49 I-84 at the Southington-Cheshire, CT town line I-91 in Meriden, CT 01988-01-011988 current
  I-291 5.44 8.75 I-91 in Springfield, MA I-90/Massachusetts Turnpike in Chicopee, MA 01972-01-011972 current
  I-391 4.46 7.18 I-91 in Chicopee, MA High Street in Holyoke, MA 01970-01-011970 current
  I-293 11.18 17.99 I-93/NH 101 in Manchester, NH I-93/Everett Turnpike in Hooksett, NH 01976-01-011976 current
  I-393 4.60 7.40 I-93 in Concord, NH NH 9 in Pembroke, NH 01979-01-011979 current
  I-294 53.42 85.97 I-80/I-94 in South Holland, IL I-94 in Deerfield, IL 01968-01-011968 current
  I-194 3.38 5.44 I-94 in Battle Creek, MI M-66 in Battle Creek, MI 01961-01-011961 current
  I-394 9.75 15.69 I-494/US 12 in Minnetonka, MN 4th Street in Minneapolis, MN 01991-01-011991 current
  I-494 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
  I-694 30.77 49.52 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
  I-194 1.20 1.93 McKenzie Drive near Bismarck, ND I-94 near Mandan, ND 01958-01-011958 current Unsigned
  I-794 3.75 6.04 I-43/I-94 in Milwaukee, WI WIS 794 in Milwaukee, WI 01980-01-011980 current
  I-894 9.92 15.96 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
  I-395 66.60 107.18 I-95 in East Lyme, CT I-290 in Auburn, MA 01983-01-011983 current
  I-295 92.30 148.54 I-95/I-495 in New Castle, DE I-95 in Bristol Township, PA 01994-01-011994 current Extended into Pennsylvania in 2018
  I-495 11.47 18.46 I-95/I-295 in Newport, DE I-95 in Lower Chichester Township, PA 01977-01-011977 current
  I-895 10.78 17.35 Newport, Delaware Claymont, Delaware 01979-01-011979[19] 01980-01-011980[20] Now part of I-95
  I-195 2.41 3.88 I-395 in Washington D.C. US 50 in Washington D.C. proposed — Currently I-395; I-395 will be rerouted onto I-695
  I-395 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
  I-495 64 103 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
  I-695 2.00 3.22 I-395 in Washington, DC I-295 in Washington, DC[21] 01958-01-011958 current Unsigned until 2011; future plans call for the route number to be replaced by an extension of I-395
  I-195 4.42 7.11 I-95/SR 112 in Miami, FL SR 905 in Miami Beach, FL 01961-01-011961 current
  I-295 61.04 98.23 Beltway around Jacksonville, FL 01970-01-011970 current
  I-395 1.29 2.08 I-95 in Miami, FL MacArthur Causeway at Watson Island, Miami, FL 01971-01-011971 current
  I-595 12.86 20.70 I-75/SR 869 in Weston, FL US 1 in Fort Lauderdale, FL 01990-01-011990 current
  I-795 7.4 11.9 I-95 south of Jacksonville, FL I-295 in Jacksonville, FL proposed — Currently signed as SR 9B pending approval of the interstate designation from the AASHTO
  I-195 1.55 2.49 I-95/Maine Turnpike in Saco, ME SR 5 in Saco, ME 01980-01-011980 current
  I-295 53.11 85.47 I-95/Maine Turnpike in Scarborough, ME I-95/Maine Turnpike in Gardiner, ME 01960-01-011960 current
  I-395 4.99 8.03 I-95/US 2/SR 100 in Bangor, ME US 1A in Brewer, ME 02008-01-012008 current
  I-495 3.70 5.95 I-95/Maine Turnpike in Portland, ME I-295/US 1 in Falmouth, ME 02004-01-012004 current Unsigned
  I-195 4.71[22] 7.58 I-95/MD 166 near Catonsville, MD Baltimore-Washington International Airport 01990-01-011990 current
  I-395 1.98 3.19 I-95 in South Baltimore, MD West Pratt Street in Baltimore, MD 01981-01-011981 current
  I-595 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
  I-695 30.57 49.20 Beltway around Baltimore, MD 01958-01-011958 current
  I-795 8.99 14.47 I-695 in Pikesville, MD MD 140 in Reisterstown, MD 01985-01-011985 current
  I-895 11.44 18.41 I-95 near Elkridge, MD I-95 in Baltimore, MD 01979-01-011979 current
  I-295 8.05 12.96 I-95/I-495 near Forest Heights, MD I-695 in Washington, DC 01964-01-011964 current
  I-195 44.55 71.70 I-95 in Providence, RI I-495/Route 25 in Wareham, MA 01958-01-011958 current
  I-295 26.58 42.78 I-95 in Warwick, RI I-95 in Attleboro, MA 01969-01-011969 current
  I-495 121.56 195.63 I-195/Route 25 in Wareham, MA I-95 in Salisbury, MA 01957-01-011957 current
  I-695 — — I-95 in Roxbury, MA I-93 in Charlestown, MA 01955-01-011955 01971-01-011971 Canceled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
  I-895 — — Route 37/I-295 in Cranston, RI I-95/I-295 in Attleboro, MA 01968-01-011968 01982-01-011982 Canceled; would have supplemented I-295 to create a full Beltway around Providence, RI
  I-195 34.17 54.99 I-295 in Hamilton Township, NJ Route 34 in Wall Township, NJ 01968-01-011968 current
  I-895 — — I-295 in Burlington, NJ I-95 in Bristol, PA 01963-01-011963 01981-01-011981 Never built
  I-295 9.79 15.76 NY 25/NY 24 in Queens, NY Bruckner Interchange in Bronx, NY 01970-01-011970 current
  I-495 71.02 114.30 Queens Midtown Tunnel in Manhattan, NY CR 58 in Riverhead, NY 01958-01-011958 current
  I-695 1.77 2.85 I-95 in Bronx, NY I-295 in Bronx, NY 01986-01-011986 current
  I-895 1.12 1.80 I-278 in Bronx, NY I-95 in Bronx, NY 01970-01-011970 02017-01-012017[23] Downgraded to a boulevard and designated as NY 895
  I-295 34.0 54.7 Cliffdale Road in Fayetteville, NC I-95 and US 13 near Eastover, NC 02019-01-012019 current Unfinished Fayetteville Outer Loop; expected to be completed in its entirety in Summer 2026
  I-495 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
  I-795 25.46 40.97 US 70/US 117 in Goldsboro, NC I-95/US 264 in Wilson, NC 02007-01-012007 current
  I-695 — — I-95 near Philadelphia International Airport I-95 in Philadelphia, PA 01964-01-011964 01977-01-011977 Never built
  I-195 3.24 5.21 SR 195 in Richmond, VA I-64/I-95 in Richmond, VA 01970-01-011970 current
  I-295 52.56 84.59 I-95 near Petersburg, VA I-64 near Short Pump, VA 01980-01-011980 current
  I-595 — — I-395 near Arlington, VA US 1 at Ronald Reagan Washington National Airport — — Now part of US 1
  I-895 — — 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 an Interstate designation, but did not get approved by AASHTO
  I-495 — — — — 01956-01-011956 01958-01-011958 Early number of I-476
  I-196 37.07[12] 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
  I-196 80.65 129.79 I-94/US 31 near Benton Harbor, MI I-96/M-37 in Grand Rapids, MI 01963-01-011963 current
  I-296 3.43 5.52 I-196 in Grand Rapids, MI I-96/M-37 in Walker, MI 01962-01-011962 current Unsigned since 1979
  I-496 11.78 18.96 I-69/I-96 near Lansing, MI I-96 and US 127 near Lansing, MI 01970-01-011970 current
  I-696 29.39 47.30 I-96/I-275 & M-5 in Novi, MI I-94 in Roseville, MI 01989-01-011989 current
  I-197 3.44 5.54 — — — 01980-01-01c. 1980 Replaced by I-595
  I-297 — — — — — 01987-01-011987 Withdrawn from request, replaced by MD 3
  •       Former
  •       Proposed and unbuilt

See also

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Notes

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  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.[12][13][14]

References

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  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Retrieved March 16, 2012.
  2. ^ a b c DeSimone, Tony (October 31, 2002). "Interstate Route Numbering". Route Log and Finder List. Federal Highway Administration. Retrieved February 3, 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 February 6, 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 from the original (PDF) 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 February 5, 2009.
  6. ^ Cavanaugh, Patricia (October 2006). "Politics and Freeways: Building the Twin Cities Interstate System". University of Minnesota.
  7. ^ a b Humphrey, Spencer (March 7, 2024). "Multiple OKC-area highways, turnpikes to be designated as interstates in coming month". KFOR-TV. Retrieved March 10, 2024.
  8. ^ 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.
  9. ^ 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 July 8, 2007.
  10. ^ Dozier, Daniel A. (September 5, 2013). "Request for I-69 Designation for I-164 from I-64 to US 41" (PDF). Letter to Richard J. Marquis. Indianapolis: Indiana Department of Transportation. Archived from the original (PDF) on March 4, 2016. Retrieved January 9, 2015 – via American Association of State Highway and Transportation Officials.
  11. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved March 2, 2012.
  12. ^ a b c Michigan Department of Transportation (2021). Next Generation PR Finder (Map). Michigan Department of Transportation. Retrieved October 11, 2021.
  13. ^ 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.
  14. ^ "Overview Map of I-275" (Map). Google Maps. Retrieved February 24, 2010.
  15. ^ "Ask SAM: Upgrades needed before US 52 can be called I-285". Winston-Salem Journal. January 10, 2014. Retrieved January 10, 2014.
  16. ^ "NCDOT: Project U-2826". Archived from the original on October 29, 2011. Retrieved April 17, 2014.
  17. ^ "State Seeking Future Interstate Designation for US 264 to Greenville" (Press release). North Carolina Governor's Office. Archived from the original on November 10, 2016. Retrieved November 10, 2016.
  18. ^ Borggren, Erica J. (October 6, 2014). "I 490 Illinois Establish" (PDF). Archived from the original (PDF) on March 3, 2016.
  19. ^ Special Committee on U.S. Route Numbering (June 25, 1979). "Route Numbering Committee Agenda Showing Action Taken by the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 501. Retrieved November 13, 2014 – via Wikimedia Commons.
  20. ^ Special Committee on U.S. Route Numbering (November 14, 1980). "Route Numbering Committee Agenda" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 519. Retrieved November 13, 2014 – via Wikimedia Commons.
  21. ^ DeBonis, Mike (November 28, 2011). "Interstate 695 Reappears in D.C." The Washington Post.
  22. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.
  23. ^ 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. Archived from the original (PDF) on June 3, 2019. Retrieved October 21, 2017.
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