List of Interstate Highways in Illinois

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Interstate Highway System in Illinois
Interstate 39 markerInterstate 255 marker
Standard Illinois Interstate Highway markers
System information
Maintained by IDOT, ISTHA, and SCC
Formed: June 29, 1956 (1956-06-29)[1]
Highway names
Interstates: Interstate X (I-X)
US Routes: U.S. Route X (US X)
State: Illinois Route X (IL X)
System links

This is a list of Interstate Highways in Illinois, all of which are owned and maintained by the U.S. state of Illinois.[2] The Illinois Department of Transportation (IDOT) is responsible for maintaining the Interstate Highways in Illinois. The Interstate Highway System in Illinois consists of twelve primary highways and eleven auxiliary highways which cover 2,169.53 miles (3,491.52 km).[3] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest Interstate Highway in Illinois is Interstate 190 at 3.07 miles (4.94 km).

Primary Interstate Highways[edit]

Number Length (mi)[3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-24 38.73 62.33 I-57 in Williamson County I-24 at Metropolis 1977 current
I-39 140.82 226.63 I-55 in Normal I-39 / I-90 in South Beloit 1989 current
I-41 0.90 1.45 I-94 / US 41 in Russell I-41 / I-94 near Russell proposed Will overlap I-94 from the US 41 split north to the state line
I-55 313.08 503.85 I-55 / I-64 in East St. Louis US 41 (Lake Shore Drive in Chicago 1960 current
I-57 364.16 586.06 I-57 near Cairo I-94 in Chicago 1969 current
I-64 128.12 206.19 I-55 / I-64 in East St. Louis I-64 in Grayville 1974 current
I-70 135.94 218.77 I-70 in East St. Louis I-70 in Clark County
I-72 177.25 285.26 I-72 / US 36 in Pike County I-57 in Champaign 1970 current
I-74 220.34 354.60 I-74 / US 6 in Moline I-74 in Danville
I-80 163.52 263.16 I-80 in Rock Island County I-80 / I-94 in Lansing 1967 current
I-88 140.60 226.27 I-80 in Silvis I-290 in Hillsdale 1987 current
I-90 123.89 199.38 I-39 / I-90 in South Beloit I-90 in Chicago
I-94 61.53 99.02 I-94 / US 41 near Russell I-80 / I-94 in Lansing

Auxiliary Interstate Highways[edit]

Number Length (mi)[3] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-155 32.13 51.71 I-55 in Logan County I-74 in Morton 1992 current
I-172 19.69 31.69 I-72 in Fall Creek US 24 in Fowler 1995 current
I-180 13.19 21.23 IL 71 in Hennepin I-80 in Bureau County
I-190 3.07 4.94 O'Hare International Airport I-90 in Chicago
I-255 27.05 43.53 I-255 in Columbia I-270 / IL 255 in Pontoon Beach
I-270 14.97 24.09 I-270 in Madison County I-70 in Troy
I-280 8.21 13.21 I-280 in Rock Island I-74 / I-80 in Colona
I-290 29.84 48.02 I-90 in Schaumburg I-90 / I-94 in Chicago
I-294 48.10 77.41 I-94 in Northbrook I-80 / I-94 in South Holland
I-355 32.5[4] 52.3 I-80 in New Lenox I-290 in Itasca 1989 current
I-474 14.88 23.95 I-74 / IL 6 in Peoria I-74 in Tazewell County

Business loops[edit]

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-55 Bus. 13.9 22.4 I-55 / I-72 / US 36 in Springfield I-55 in Williams Township
I-55 Bus. 0 0
I-55 Bus. 0 0
I-72 Bus. 9.5 15.3 I-72 / US 36 / US 67 southwest of Jacksonville I-72 in Jacksonville

See also[edit]

References[edit]

  1. ^ McNichol, Dan (2006). The Roads that Built America. New York: Sterling. p. 106. ISBN 1-4027-3468-9. 
  2. ^ Staff. "Interstate Frequently Asked Questions". Federal Highway Administration. Retrieved February 25, 2008. 
  3. ^ a b c Staff (October 31, 2002). "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 March 17, 2008. 
  4. ^ I-355 originally ran 20.01 miles (32.20 km) from I-55 to I-290, according to Illinois' 2005 GIS data. The southern extension added 12.5 miles (20.1 km) to this length, according to the Illinois State Toll Highway Authority.