List of Interstate Highways in Illinois

Interstate Highway System in Illinois
Standard Illinois Interstate Highway markers
System information
Maintained by IDOT, ISTHA, and SCC
Length:	2,248.93 mi (3,619.30 km)
Formed:	June 29, 1956 (1956-06-29)
Highway names
Interstates:	Interstate X (I-X)
US Highways:	U.S. Route X (US X)
State:	Illinois Route X (IL X)
System links
Illinois State Highway System Interstate U.S. State Tollways

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. 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). 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).