# List of auxiliary Interstate Highways

(Redirected from Three-digit Interstate)
Dwight D. Eisenhower National System of Interstate and Defense Highways
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)

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 in each 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 there are none available, causing a "non-standard" number to be used.

### Spur route

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

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

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 are listed 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
H-201 4.10 6.60 H-1 in Halawa H-1 in Honolulu 1989[4] current Signed as Route 78 until 2004
I-105 17.32 27.87 SR 1 in El Segundo I-605 in Norwalk 1963 current Replaced segments of SR 42
I-205 12.97 20.87 I-580 near Tracy I-5 near Tracy 1970 current
I-305 6.00 9.66 I-80 in West Sacramento I-80 Bus/US 50/SR 99 in Sacramento 1981 current Unsigned
I-405 72.15 116.11 I-5 in Irvine I-5 in Mission Hills 1964 current
I-505 32.98 53.08 I-80 in Vacaville I-5 in Dunnigan 1977 current Originally part of Interstate I-5W
I-605 27.40 44.10 I-405 in Seal Beach I-210 in Irwindale 1964 current
I-805 28.02 45.09 I-5 in San Ysidro I-5 in Sorrento Valley 1959 current
I-905 8.96[5] 14.42 I-5 in San Ysidro Fed. 2 at the United States-Mexico border in Otay Mesa proposed Currently SR 905, proposed to be signed as an Interstate
I-105 3.49 5.62 OR 99 in Eugene I-5 in Springfield 2011 current
I-405 3.53 5.68 I-5 in Portland I-5 in Portland
I‑205 36.64 58.97 I-5 in Tualatin, OR I-5 in Salmon Creek, WA 1975 current
I‑405 30.30 48.76 I-5/SR 518 in Tukwila I-5/SR 525 in Lynnwood 1964 current
I‑605 proposed Proposed to bypass Seattle
I‑705 1.50 2.41 I-5/SR 7 in Tacoma 1990 current Schuster Parkway in Tacoma
I-110 20.43 32.88 SR 47 in San Pedro, Los Angeles I-10/SR 110 in Los Angeles 1978 current Originally part of US 66, then signed as SR 11
I-210 48.72 78.41 I-5 in Sylmar SR 57/SR 210 in Glendora 1964 current Segment from SR 57 east to I-10 is still signed as the state highway SR 210, formerly SR 30 prior to 2007.
I-710 19.66 31.64 Terminal Island in Long Beach Valley Boulevard in Alhambra 1983 current Originally signed as SR 7
I-110 6.94 11.17 US 98 Bus near Pensacola I-10 near Pensacola 1969 current
I-110 8.89 14.31 I-10 in Baton Rouge US 61 in Baton Rouge 1965 current
I-210 12.40 19.96 I-10 near Sulphur I-10 in Lake Charles 1962 current
I-310 11.25 18.11 US 90 in Boutte I-10 near Kenner 1993 current
I-510 5.10 8.21 LA 47 in New Orleans I-10 in New Orleans 1992 current
I-610 4.52 7.27 I-10 at the Orleans-Jefferson Parish I-10 in New Orleans 1956 current
I-910 9.70 15.61 US 90 Bus in Marrero I-10 in New Orleans 1999 current Unsigned
I-110 4.10 6.60 US 90 in Biloxi I-10 in D'Iberville 1988 current
I-310 US 90 near the Port of Gulfport I-10 in Gulfport proposed Future spur into Gulfport, MS
I-110 0.92 1.48 Av Abraham Lincoln at the United States-Mexico border in El Paso I-10 in El Paso 1967 current Shortest signed Interstate in the country
I-410 49.49 79.65 Beltway around San Antonio 1959 current
I-610 37.97 61.11 Beltway around Houston 1975 current
I-215 54.50 87.71 I-15 in Murrieta I-15 in Devore 1982 current Originally signed as I-15E, then SR 215
I‑115 1.19 1.92 I-15/I-90 in Butte Iron Street in Butte 1971 current
I‑315 0.83 1.34 I-15 in Great Falls I-15 Bus/US 89 in Great Falls 1960 current Unsigned
I‑215 11.10 17.86 I-15/Clark County Route 215 near Paradise I-515/US 93/SR 564 in Henderson 1996 current
I‑515 20.54 33.06 US 93/US 95 in Henderson I-15/US 93/US 95 in Las Vegas 1976 current Not signed until 1994
I-215 29.02 46.70 I-80 in Salt Lake City I-15 in North Salt Lake 1963 current
I‑516 6.49 10.44 SR 21/SR 204 in Savannah SR 21 in Garden City 1985 current
I‑520 16.14 25.97 I-20 in Augusta, GA I-20 in North Augusta, SC 1980 current
I-220 17.62 28.36 I-20 in Shreveport I-20 in Bossier City 1991 current
I-220 12.01 19.33 I-20 in Jackson I-55 in Ridgeland 1981 current
I-820 35.17 56.60 I-20 in Fort Worth I-20 / US 287 in Fort Worth 1959 current
I‑222 I-22 near Birmingham, AL Interstate 422 near Birmingham, AL proposed
I‑422 I-20/I-59/I-459/US 11 in Bessemer I-59 in Argo proposed
I-124 1.97 3.17 I-24 in Chattanooga US 27 in Chattanooga 1960 current Unsigned
I-225 12.00 19.31 I-25 in Denver I-70 in Aurora 1976 current
I-126 3.68 5.92 I-26 in Columbia US 21/US 76/US 176/US 321 in Columbia 1961 current
I-526 19.26 31.00 US 17 in Charleston I-526 Bus/US 17 in Mount Pleasant 1989 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 1976 current
I-229 14.97 24.09 I-29 in St. Joseph I-29/US 59/US 71 in St. Joseph 1986 current
I-229 11.33 18.23 I-29 in Sioux Falls I-90 near Sioux Falls 1966 current
I-130 proposed Proposed route in Texarkana
I-430 12.93 20.81 I-30/US 67 in Little Rock I-40/US 65 in Little Rock 1980 current
I-530 46.65 75.08 US 65 in Pine Bluff I-30/I-440 in Little Rock 1999 current
I-630 7.40 11.91 I-430 near Little Rock I-30 in Little Rock 1985 current
I-235 13.78 22.18 I-35/I-80 in West Des Moines I-35/I-80 near Des Moines 1961 current
I-135 95.74 154.08 Kan. Tpk./I-35 in Wichita I-70/US 81 in Salina 1976 current
I-235 16.52 26.59 I-135/US 81 in Wichita I-135/US 81/K-15/K-254 in Wichita 1965 current
I-335 50.13 80.68 I-35/Kan. Tpk./US 50 in Emporia I-470/Kan. Tpk. in Topeka 1987 current
I-435 80.81 130.05 Beltway around Kansas City, KS and Kansas City, MO 1965 current
I-635 8.90 14.32 I-35 in Overland Park, KS I-29/US 71 in Kansas City, MO 1968 current
I-335 2.74[6] 4.41 I-94 in Minneapolis I-35W in Minneapolis 1964 1978 Cancelled
I-535 2.78 4.47 I-35/US 53 in Duluth, MN US 53/WIS 35 in Superior, WI 1971 current
I‑235 5.36 8.63 I-35/I-40 in Oklahoma City I-44 in Oklahoma City 1989 current
I-635 37.00 59.55 SH 121 in Grapevine I-20 in Balch Springs 1959 current
I-238 2.23 3.59 I-880 in San Leandro, CA I-580/SR 238 in Castro Valley, CA 1983 current Considered an auxiliary route of I-80 in California; there is no I-38
I-440 9.96 16.03 I-30/I-530 near Little Rock I-40/AR 440 near Little Rock 2003 current
I-540 15.87 25.54 US 271/AR 253 near Fort Smith US 62/US 71 in Bentonville 1965 current
I‑140 6.79 10.93 US 17/US 421 near Navassa I-40/US 17 in Wilmington 2008 current
I‑240 9.54 15.35 I-26/I-40/US 74 near Asheville I-40/US 74A in Asheville 1980 current
I‑440 16.77 26.99 I-40/US 1/US 64 near Cary I-40 near Raleigh 1991 current
I‑540 25.84 41.59 I-40 near Durham I-495/US 64/US 264 near Knightdale 1997 current
I‑840 5.77 9.29 I-40/I-73/US 421 in Greensboro I-40/I-85/I-785/I-85 Bus. in Greensboro 2011 current
I‑240 16.22 26.10 I-44/US 62 in Oklahoma City I-40/US 270 in Oklahoma City 1965 current
I-140 11.17 17.98 I-40 near Farragut US 129 near Alcoa 1987 current
I-240 19.27 31.01 I-40 in Memphis I-40 in Memphis 1970 current
I-440 7.64 12.30 I-40 in Nashville I-24 in Nashville 1987 current
I-640 7.03 11.31 I-40 in Knoxville I-40 in Knoxville 1982 current
I-840 77.28[7] 124.37 I-40 near Dickson I-40 near Lebanon 2016 current
I‑244 15.75 25.35 I-44 in Tulsa I-44 in Tulsa 1970 current
I‑444 2.51 4.04 I-244 in Tulsa I-244 in Tulsa 1970 current Unsigned
I-345 1.40 2.25 I-30/I-45 in Dallas, TX US 75 in Dallas, TX 1973 current Unsigned
I-555 49.8 80.1 I-55 in Turrell AR 91 in Jonesboro 2016 current
I-155 32.13 51.71 I-74 in Morton I-55 in Lincoln 1992 current
I-255 30.82 49.60 I-55/I-270 in Mehlville, MO I-270/IL 255 in Pontoon Beach, IL 1986 current
I-355 32.51 52.32 I-80 in New Lenox I-290 in Itasca 1989 current
I-155 15.93 25.64 I-55 near Hayti, MO US 51 at Dyersburg, TN 1980 current
I‑359 2.30 3.70 I-20/I-59 in southern Tuscaloosa 15th Street in downtown Tuscaloosa 1983 current
I‑459 32.80 52.79 I-20/I-59 in Bessemer I-59 in Trussville 1984 current
I‑759 4.50 7.24 I-59 in Attalla US-411/SR-759 in Gadsden 1986 current
I-164 21.39[8] 34.42 US 41/Veterans Memorial Parkway in Evansville, IN I-69 in Evansville, IN 1990 2014 Decommissioned; now part of I-69[9]
I-264 22.93 36.90 I-64 in Louisville I-71 in Louisville 1956 current
I‑264 25.07 40.35 I-64/I-664 in Chesapeake Parks Ave in Virginia Beach 1960 current
I‑464 4.71 7.58 I-64 in Chesapeake I-264 in Norfolk 1960 current
I‑564 3.03 4.88 SR 337 I-64 in Norfolk 1970 current
I‑664 20.21 32.52 I-64/I-264 in Norfolk I-64 in Hampton 1971 current
I‑165 4.90 7.89 US-43 in Mobile I-65 in Mobile 1994 current
I‑565 21.40 34.44 I-65/US-72/SR-20 in Decatur US-72 in Huntsville 1991 current
I-265 6.73 10.83 I-64 in New Albany, IN SR 62/SR 265 in Clarksville, IN 1977 current Connected with I-265 in Kentucky on December 18, 2016, with the completion of the East End Bridge
I-465 52.79 84.96 Beltway around Indianapolis 1970 current
I-865 4.72 7.60 I-65 near Indianapolis I-465 near Indianapolis 2002 current
I-265 24.48 39.40 I-65/KY 841 in Heritage Creek I-71/KY 841 in Prospect 1977 current To be connected with I-265 in Indiana in late 2016 with the completion of the East End Bridge
I-469 30.83 49.62 I-69 in Fort Wayne I-69 in Fort Wayne 1995 current
I-169 49 79 I-24 near Hopkinsville, Kentucky I-69 in Nortonville, Kentucky 2017 current New designation along the former Pennyrile Parkway
I-369 Future I-69/Pennyrile Parkway in Henderson US 60 in Owensboro proposed
I-269 4.20 6.76 I-55/I-69 in Hernando, MS I-69 in Millington, TN 2015 current Currently under construction; partially open
I-169 Union City, TN Martin, TN proposed
I-169 1.50 2.41 I-69E/US 77/US 83 in Olmito Port of Brownsville main entrance in Brownsville 2015 current Currently under construction; partially open and co-signed with SH 550
I-369 3.50 5.63 Tenaha Texarkana, Texas 2013 current Partially completed in 2013
I-270 5.31 8.55 I-25/US 36 at Welby I-70/US 36 at Denver 1965 current
I-270 50.59 81.42 I-55/I-255 in Mehlville, MO I-55/I-70 near Troy, IL 1956 current
I-470 13.72 22.08 I-70 in Topeka I-70/Kan. Tpk. in Topeka 1960 current
I-670 2.81 4.52 I-70 in Kansas City, KS I-70 in Kansas City, MO 1968 current
I-170 2.3 3.7 I-70 US 40 1969 1983 Cancelled
I-270 34.40 55.36 I-70 near Frederick I-495 north of Bethesda 1975 current

I-270 Spur
2.10[10] 3.38 I-270 east of Potomac I-495 northwest of Bethesda 1975 current
I-370 2.54 4.09 I-270 in Gaithersburg MD 200 in Derwood 1988 current
I-170 11.17 17.98 I-64/US 40 in Richmond Heights I-270 in Hazelwood 1956 current
I-470 16.72 26.91 I-49/I-435 in Kansas City, MO I-70 in Independence, MO 1983 current
I-270 54.97 88.47 Beltway around Columbus 1964 current
I-470 6.69 10.77 I-70 near Blaine, OH I-70 in Elm Grove, WV 1976 current
I-670 9.37 15.08 I-70 in Columbus I-270 near Port Columbus International Airport 2003 current
I-271 46.06 74.13 I-71 near Medina, OH I-90 in Willoughby Hills, OH 1964 current
I-471 5.75 9.25 I-275 near Newport, KY I-71 in Cincinnati, OH 1981 current
I-172 19.69 31.69 I-72 in Quincy, IL US 24 in Quincy, IL 1995 current
I-474 14.88 23.95 I-74 in Peoria, IL I-74 in Morton, IL 1973 current
I‑274 proposed Proposed route in Winston-Salem
I-175 1.44 2.32 I-275 in St. Petersburg, FL SR 687 in St. Petersburg, FL 1980 current
I-275 60.64 97.59 I-75 near Memphis I-75 in Wesley Chapel 1973 current
I-375 1.34 2.16 I-275 in St. Petersburg US 92 in St. Petersburg 1979 current
I‑475 15.83 25.48 I-75 in Macon I-75 in Macon 1965 current
I‑575 30.97 49.84 I-75 in Kennesaw SR 5 west of Nelson 1985 current
I‑675 11.04 17.77 I-75 in Stockbridge, GA I-285 southeast of Atlanta, GA 1987 current
I-275 83.71 134.72 Beltway around Cincinnati, OH 1962 current Runs through Indiana, Ohio and Kentucky; I-75 does not run through Indiana
I-275 35.01[11][a] 56.34 I-75 near Monroe, MI I-96, I-696 & M-5 in Farmington Hills 1977 current
I-375 1.06 1.71 BS I-375 in Detroit, MI I-75 in Detroit, MI 1964 current
I-475 16.99 27.34 I-75 near Grand Blanc, MI I-75/US 23 near Mount Morris, MI 1973 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 1971 current
I-475 20.37 32.78 I-75 in Perrysburg I-75 in Toledo 1964 current
I-675 26.53 42.70 I-75 near Miamisburg I-70 near Medway 1987 current
I-275 2.98 4.80 I-40 in Knoxville I-75/I-640 in Knoxville 1982 current
I-676 6.90 11.10 I-76/US 30 in Philadelphia I-76 in Camden, NJ 1991 current
I-176 11.33 18.23 I-76/Penna Tpk. in Morgantown US 422 near Reading 1964 current
I-276 32.65 52.55 I-76 in King of Prussia Delaware River bridge (Pennsylvania-NJ state line)(current)
I-95/I-295 in Bristol Township (future)
1964 current
I-376 78.70 126.66 I-80 near Hermitage I-76/US 22 in Monroeville 1972 current
I-476 129.61 208.59 I-95 near Chester, PA I-81 near Clarks Summit, PA 1992 current Longest Auxiliary Interstate in the country
I-576 proposed Proposed Southern Beltway route from Pittsburgh International Airport to I-376
I‑277 4.46 7.18 Beltway around uptown Charlotte, NC 1981 current
I-277 4.14 6.66 I-76 in Akron I-77 in Akron 1970 current
I-278 35.62 57.32 US 1/9 in Linden, New Jersey Bruckner Interchange in Bronx, New York 1961 current
I-478 2.14 3.44 I-278 in Brooklyn, New York NY 9A in Manhattan, New York 1971 current Unsigned
I-678 14.33 23.06 John F. Kennedy International Airport in Queens, New York Bruckner Interchange in Bronx, New York 1965 current
I-878 0.70 1.13 I-678 in Queens, New York near JFK Airport JFK Expressway in Queens, New York near JFK Airport 1970 current Unsigned
I-279 13.32 21.44 I-376/US 22/US 30 in Pittsburgh I-79 in Franklin Park 1972 current
I-579 1.57 2.53 PA 885 in Pittsburgh I-279/PA 28 in Pittsburgh 1962 current
I-180 US 101 in San Rafael I-80 near Berkeley 1978 1991 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 King Street in San Francisco 1964 current
I-380 1.671 2.689 I-280 in San Bruno US 101 1964 current
I-480 I-80 in San Francisco Sansome Street in San Francisco 1957 1968 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 I-5 near Westley 1964 current Segments were originally part of I-5W
I-680 70.52 113.49 I-280/US 101 in San Jose I-80 in Cordelia 1955 current Originally SR 21
I-780 6.50 10.46 I-80 in Vallejo I-680 in Benicia 1955 current Originally part of I-680
I-880 47.22 75.99 I-280/SR 17 in San Jose I-80/I-580 in Oakland 1983 current Originally part of SR 17
I-980 2.03 3.27 I-880 in Downtown Oakland I-580/SR 24 in Oakland 1981 current
I‑580 30.09 48.43 US 50 in Carson City I-80 in Reno 2012 current Runs concurrently with US 395
I-180 13.19 21.23 IL 26/IL 71 in Hennepin, Illinois I-80 near Princeton, Illinois 1969 current
I-280 26.98 43.42 I-80 near Davenport, IA I-74/I-80 near Colona, IL 1990 current
I-380 73.05 117.56 I-80 near Iowa City US 218 in Waterloo 1985 current Connects Cedar Rapids with I-80
I-480 4.90 7.89 I-80/US 75 in Omaha, NE I-29/US 6 in Council Bluffs, IA 1966 current
I-680 42.86 68.98 I-80 in Omaha, NE I-80 near Neola, IA 1966 current
I-180 3.18 5.12 US 34 (9th St. / 10th St.) in Lincoln I-80 / US 34 / US 77 in Lincoln 1964 current
I-580 1.60 2.57 I-480 in Omaha Lake Street in Omaha 1976 1982 Now part of US 75
I-280 17.85 28.73 I-80 in Parsippany-Troy Hills I-95/NJ Tpk. in Kearny 1958 current
I-280 12.41 19.97 I-75 in Toledo, OH I-80/I-90/Ohio Tpk. in Lake Township, OH 1959 current
I-480 41.77 67.22 I-80/Ohio Tpk. in North Ridgeville, OH I-80/Ohio Tpk. in Streetsboro, OH 1971 current
I-680 16.43 26.44 I-76/Ohio Tpk. in North Lima, OH I-80/SR 11 near Mineral Ridge, OH 1964 current
I-180 28.85 46.43 US 15/US 220 in Williamsport, PA I-80/PA 147 near Milton, PA 1984 current
I-380 24.76 39.85 I-80 in Tunkhannock Township. PA I-81/I-84/US 6 in Dunmore, PA 1973 current
I-180 1.09 1.75 I-80 in Cheyenne, WY I-80 Bus/US 30 in Cheyenne, WY 1984 current Not built to Interstate Highway standards
I-481 15.04 24.20 I-81 in Onondaga, NY I-81/NY 481 in North Syracuse 1970 current
I-781 4.30 6.92 I-81 in Pamelia, NY Fort Drum main gate in Le Ray, NY 2012 current
I‑381 1.67 2.69 SR 381 in Bristol I-81 in Bristol 1961 current
I‑581 6.64 10.69 US 220/SR 24 in Roanoke I-81 near Hollins
I‑182 15.19 24.45 I-82/US 12 near Richland US 12/US 395 in Pasco 1986 current
I-283 2.91 4.68 I-76/Penna Tpk. near Highspire I-83/US 322/Capital Beltway near Harrisburg 1972 current
I-384 8.20 13.20 I-84/US 6 in East Hartford US 6/US 44 in Bolton 1984 current
I-684 28.47 45.82 I-287 near White Plains, NY NY 22 near Brewster, NY 1974 current Also crosses into Connecticut
I-184 3.62 5.83 I-84 in Boise, ID US 20/US 26 1990 current
I‑685 14.00 22.53 I-65 in downtown Montgomery, AL I-85 in Montgomery, AL proposed
I‑185 49.30 79.34 US 27/US 280/SR 520 in Columbus I-85 near LaGrange 1979 current
I‑285 63.98 102.97 Beltway around Atlanta, GA 1969 current
I‑985 24.04 38.69 I-85 near Buford, GA SR 369 near Gainesville 1985 current
I‑285 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
I‑485 66.68 107.31 Beltway around Charlotte, NC 1988 current
I‑785 2.21 3.56 I-40/I-85/I-840/I-85 Bus. in Greensboro, NC US 70 in Greensboro, NC 2013 current
I-185 17.70 28.49 I-385 near Mauldin, SC US 29 in Greenville, SC 1955 current
I-385 42.16 67.85 I-26 near Clinton, SC US 276 in Greenville, SC 1962 current
I-585 2.25 3.62 US 176/US 221/SC 9 in Spartanburg, SC I-85 Bus./US 176 near Spartanburg, SC 1962 current
I‑785 I-40/I-85/I-840 US 29/US 58/US 360/US 58 Bus. in Danville, VA proposed
I-287 98.72 158.87 I-95/NJ Tpk. in Edison, NJ I-95 in Rye, NY 1961 current
I-587 1.21 1.95 I-87/Thruway/NY 28 in Kingston, NY NY 28/NY 32 in Kingston, NY 1960 current
I‑587 Future I 87 (current US 64) near Zebulon, NC US 264 near Greenville, NC proposed[14]
I-787 10.16 16.35 I-87/Thruway in Albany, NY NY 7 in Green Island, NY 1968 current
I-189 1.49 2.40 US 7 in South Burlington, VT I-89 in South Burlington 1980 current
I-190 3.07 4.94 O'Hare International Airport in Chicago, IL I-90 in Chicago, IL 1978 current
I-290 29.84 48.02 I-90/IL 53 in Rolling Meadows, IL I-90/I-94/Congress Parkway in Chicago, IL 1972 current
I-490 I-294 I-90 proposed Proposed route number for the O'Hare West Bypass[15]
I‑190 19.26 31.00 I-290 in Worcester, MA Route 2 in Leominster, MA 1983 current
I‑290 20.16 32.44 I-395 in Auburn, MA I-495 in Marlborough, MA 1970 current
I-190 28.34 45.61 I-90/Thruway in Cheektowaga, NY Highway 405 at Lewiston, NY 1959 current
I-290 9.80 15.77 I-190 in Tonawanda, NY I-90/Thruway in Williamsville, NY 1964 current
I-390 76.06 122.41 I-86/NY 17 in Avoca, NY I-490 in Gates, NY 1973 current
I-490 37.40 60.19 I-90/Thruway in Bergen, NY I-90/Thruway in Victor, NY 1970 current
I-590 5.31 8.55 I-390 in Brighton, NY I-490/NY 590 in Rochester, NY 1980 current
I-690 14.19 22.84 I-90/Thruway/NY 690 in Van Buren, NY I-481 in East Syracuse, NY 1962 current
I-790 2.41 3.88 I-90/Thruway in Deerfield, NY NY 5A/NY 55 in Utica, NY 1961 current
I-890 9.35 15.05 I-90/Thruway in Rotterdam, NY I-90/Thruway in Guilderland, NY 1962 current
I-990 6.35 10.22 I-290 in Amherst, NY NY 263 near Lockport, NY 1985 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 1990 current
I-190 1.72 2.77 I-90 in Rapid City, SD US 16 in Rapid City, SD 1962 current
I-291 6.02 9.69 I-91 in Windsor, CT I-84 in Manchester, CT 1994 current
I-691 8.38 13.49 I-84 at the Southington-Cheshire town line, CT I-91 in Meriden, CT 1988 current
I‑291 5.44 8.75 I-91 in Springfield, MA I-90/Mass Pike in Chicopee, MA 1972 current
I‑391 4.46 7.18 I-91 in Chicopee, MA High Street in Holyoke, MA 1970 current
I‑293 11.18 17.99 I-93/NH 101 in Manchester, NH I-93/Everett Tpke in Hooksett, NH 2008 current
I‑393 4.60 7.40 I-93 in Concord, NH NH 9 in Pembroke, NH 1979 current
I-294 53.42 85.97 I-80/I-94 in South Holland, Illinois I-94 in Deerfield, Illinois 1968 current
I-194 3.38 5.44 I-94 in Battle Creek. MI M-66 in Battle Creek, MI 1961 current
I-394 9.75 15.69 I-494/US 12 in Minnetonka, MN 4th Street in Minneapolis, MN 1991 current
I-494 42.94 69.11 I-94/I-694 in Maple Grove, MN I-94/I-694 in Woodbury, MN 1985 current Western and southern half of the Minneapolis–St. Paul beltway
I-694 22.62 36.40 I-94/I-494 in Maple Grove, MN I-94/I-494 in Woodbury, MN 1970 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 Unsigned
I-794 3.75 6.04 I-43/I-94 in Milwaukee, WI WIS 794 in Milwaukee, WI 1980 current
I-894 4.70 7.56 I-94 in Milwaukee, WI I-43/I-94 in Milwaukee, WI 1966 current
I-395 54.69 88.02 I-95 in East Lyme, CT I-290 in Auburn, MA 1983 current
I‑295 73.77 118.72 I-95/I-495 in New Castle, DE I-95/US 1 in Lawrence Township, NJ 1994 current
I‑495 11.47 18.46 I-95/I-295 in Newport, DE I-95 in Claymont, DE 1977 current
I‑295 6.00 9.66 I-95/I-495 near Forest Heights, MD I-695 in Washington, DC 1964 current
I‑395 13.39 21.55 I-95/I-495 in Springfield, VA US 50 in Washington, DC 1977 current Original route of I-95 that was proposed to continue through Washington, DC
I‑495 31.41 50.55 Beltway around Washington, DC 1961 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[16] 1958 current
I-195 4.42 7.11 I-95/SR 112 in Miami, FL SR 905 in Miami Beach, FL 1961 current
I-295 61.04 98.23 Beltway around Jacksonville 1970 current
I-395 1.29 2.08 I-95 MacArthur Causeway at Watson Island, Miami, FL 1971 current
I-595 12.86 20.70 I-75/SR 869 in Weston, FL US 1 in Fort Lauderdale, FL 1990 current
I-795 Interstate 95 south of Jacksonville I-295 in Jacksonville proposed Currently under construction; partially open as SR 9B but not yet signed as I-795
I‑195 1.55 2.49 I-95/Maine Tpk. in Saco, ME SR 5 in Saco, ME 1980 current
I‑295 53.11 85.47 I-95/Maine Tpk. in Scarborough, ME I-95/Maine Tpk. in Gardiner, ME 1960 current
I‑395 4.99 8.03 I-95/US 2/SR 100 in Bangor, ME US 1A in Brewer, ME 2008 current
I‑495 3.70 5.95 I-95/Maine Tpk. in Portland, ME I-295/US 1 in Falmouth, ME 2004 current Unsigned
I-195 4.71[17] 7.58 I-95/MD 166 near Catonsville, MD Baltimore-Washington International Airport 1990 current
I-395 1.98 3.19 I-95 in South Baltimore, MD West Pratt Street in Baltimore, MD 1981 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 2011 current Unsigned designation for US 50
I-695 30.57 49.20 Beltway around Baltimore 1958 current
I-795 8.99 14.47 I-695 in Pikesville, MD MD 140 in Reisterstown, MD 1985 current
I-895 11.44 18.41 I-95 near Elkridge, MD I-95 in Baltimore, MD 1979 current
I‑295 8.05 12.96 I-95/I-495 near Forest Heights, MD I-695 in Washington, DC 1964 current
I‑195 44.55 71.70 I-95 in Providence, RI I-495/Route 25 in Wareham, MA 1958 current
I‑295 26.58 42.78 I-95 in Warwick, RI I-95 in Attleboro, MA 1969 current
I‑495 121.56 195.63 I-195/Route 25 in Wareham, MA I-95 in Salisbury, MA 1957 current
I‑695 I-93 in Roxbury, Boston I-93 in Charlestown, Boston 1955 1971 Cancelled; was to have been built in connection with a planned alignment of I-95 through downtown Boston
I-195 34.17 54.99 I-295 in Hamilton Township, NJ Route 34 in Wall Township, NJ 1968 current
I-295 7.70 12.39 Hillside Avenue (NY 25)/NY 24 in Queens, NY Bruckner Interchange in the Bronx, NY 1970 current
I-495 66.38 106.83 Queens Midtown Tunnel in Manhattan, NY CR 58 in Riverhead, NY 1958 current
I-695 1.40 2.25 I-95 in the Bronx, NY I-295 in the Bronx, NY 1986 current
I-895 1.12 1.80 I-278 in the Bronx, NY I-95 in the Bronx, NY 1970 current
I‑295 proposed Planned route around the west side of Fayetteville, NC
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 2013 current
I‑795 25.46 40.97 US 70/US 117 in Goldsboro, NC I-95/US 264 in Wilson, NC 2007 current
I‑195 3.24 5.21 SR 195 in Richmond, VA I-64/I-95 in Richmond, VA 1970 current
I‑295 52.56 84.59 I-95 near Petersburg, VA I-64 near Short Pump, VA 1980 current
I-196 37.07[11] 59.66 US 31 in Norton Shores, MI I-96/US 16 in Grand Rapids, MI 1959 1963 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 1963 current
I-296 3.43 5.52 I-196 in Grand Rapids, MI I-96/M-37 in Walker, MI 1962 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 1970 current
I-696 29.39 47.30 I-96/I-275 & M-5 in Novi, MI I-94 in Roseville, MI 1989 current
•       Former
•       Future

## 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 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 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. ^ Tabb, John R. (December 8, 1990). "Report of the Special Committee on U.S. Route Numbering to the Executive Committee" (PDF) (Report). Phoenix, AZ: American Association of State Highway and Transportation Officials.
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. ^ 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 July 17, 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. Archived from the original on July 17, 2007. Retrieved July 8, 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 January 9, 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 March 2, 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 February 6, 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 February 24, 2010.
14. ^ "State Seeking Future Interstate Designation for U.S. 264 to Greenville". North Carolina Governor's Office. Retrieved 10 November 2016.
15. ^ [1]
16. ^ Mike DeBonis (28 November 2011). "Interstate 695 reappears in D.C.". Washington Post.
17. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 24, 2012.