List of Interstate Highways in Illinois

The Interstate Highways in Illinois are all segments of the Interstate Highway System that are owned and maintained by the U.S. state of Illinois.[3] The Illinois Department of Transportation (IDOT) is responsible for maintaining these highways in Illinois. The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km).[1] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest is Interstate 41 at 0.90 miles (1.45 km).

Interstate Highway System in Illinois
Standard Illinois Interstate Highway markers
System information
Maintained by IDOT, ISTHA, and SCC
Length2,248.93 mi[1] (3,619.30 km)
FormedJune 29, 1956 (1956-06-29)[2]
Highway names
InterstatesInterstate X (I-X)
US HighwaysU.S. Route X (US X)
StateIllinois Route X (IL X)
System links

Primary Interstate Highways

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-24 38.7362.33 I-57 in Williamson CountyI-24 at Metropolis 01977-01-011977current
I-39 123.42198.63 I-55 in NormalI-39 / I-90 in South Beloit 01989-01-011989current
I-41 0.901.45 I-94 / US 41 in RussellI-41 / I-94 near Russell 02015-04-072015[4]current Overlaps I-94 from the US 41 split north to the state line
I-55 313.08503.85 I-55 / I-64 in East St. LouisUS 41 (Lake Shore Drive) in Chicago 01960-01-011960current
I-57 364.16586.06 I-57 near CairoI-94 in Chicago 01969-01-011969current Longest Interstate in Illinois
I-64 128.12206.19 I-55 / I-64 in East St. LouisI-64 in Grayville 01974-01-011974current
I-70 135.74218.45 I-70 in East St. LouisI-70 in Clark County
I-72 177.25285.26 I-72 / US 36 in Pike CountyI-57 in Champaign 01970-01-011970current
I-74 220.34354.60 I-74 / US 6 in MolineI-74 in Danville
I-80 163.52263.16 I-80 in Rock Island CountyI-80 / I-94 in Lansing 01967-01-011967current
I-88 140.60226.27 I-80 in SilvisI-290 in Hillside 01987-01-011987current Overlaps IL 110 through the entire route
I-90 123.89199.38 I-39 / I-90 in South BeloitI-90 in Chicago
I-94 61.5399.02 I-94 / US 41 near RussellI-80 / I-94 in Lansing

Auxiliary Interstate Highways

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-155 32.1351.71 I-55 in Logan CountyI-74 in Morton 01992-01-011992current
I-172 19.6931.69 I-72 in Fall CreekUS 24 in Fowler 01995-01-011995current
I-180 13.1921.23 IL 71 in HennepinI-80 in Bureau County 01967-01-011967current
I-190 3.074.94 O'Hare International AirportI-90 in Chicago 01978-01-011978current Shortest auxiliary interstate in Illinois
I-255 27.0543.53 I-255 in ColumbiaI-270 / IL 255 in Pontoon Beach 01967-01-011967current
I-270 14.9724.09 I-270 in Madison CountyI-70 in Troy 01956-01-011956current
I-280 17.6028.32 I-280 in Rock IslandI-74 / I-80 in Colona
I-290 29.8448.02 I-90 in SchaumburgI-90 / I-94 in Chicago 01955-01-011955current
I-294 53.4285.97 I-94 in NorthbrookI-80 / I-94 in South Holland 01957-01-011957current Longest auxiliary interstate in Illinois
I-355 32.5152.32 I-80 in New LenoxI-290 in Itasca 01989-01-011989current
I-474 14.8823.95 I-74 / IL 6 in PeoriaI-74 in Tazewell County
I-490 I-294 in Franklin ParkI-90 in Des Plaines proposed To be opened by 2025
I-494 Proposal for Lake Shore Drive
I-494 Proposed and cancelled Crosstown Expressway
I-694 01960-01-01196001970-01-011970
  •       Former

Business loops

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-55 Bus. 13.922.4 I-55 / I-72 / US 36 in SpringfieldI-55 in Williams Township
I-55 Bus.
I-55 Bus.
I-72 Bus. 9.515.3 I-72 / US 36 / US 67 southwest of JacksonvilleI-72 in Jacksonville

See also

  • Illinois portal
  • U.S. Roads portal


  1. Adderly, Kevin (January 15, 2014). "Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico". Route Log and Finder List. Federal Highway Administration. Retrieved April 7, 2015.
  2. McNichol, Dan (2006). The Roads that Built America. New York: Sterling. p. 106. ISBN 1-4027-3468-9.
  3. Staff. "Interstate Frequently Asked Questions". Federal Highway Administration. Retrieved February 25, 2008.
  4. Srubas, Paul (April 9, 2015). "US 41 Named Officially to Interstate Highway System". Green Bay Press Gazette.
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