List of U.S. Highways in Illinois
This is a list of U.S. Highways in Illinois, all of which are owned and maintained by the U.S. state of Illinois. The Illinois Department of Transportation (IDOT) is responsible for maintaining the U.S Highways in Illinois. The system in Illinois consists of 20 primary highways.
| United States Numbered Highway System in Illinois | |
|---|---|
Standard Illinois U.S. Highway markers | |
| System information | |
| Maintained by IDOT, ISTHA, and CDOT | |
| Formed | November 11, 1926 |
| Highway names | |
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Route X (US X) |
| State | Illinois Route X (IL X) |
| System links | |
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