List of U.S. Highways in Illinois
| United States Numbered Highway System in Illinois | |
|---|---|
  
Standard Illinois U.S. Highway markers
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| System information | |
| Maintained by IDOT and ISTHA | |
| 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 | |
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 21 primary highways.
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