Back Liste der State-, U.S.- und Interstate-Highways in Illinois German Anexo:Carreteras estatales de Illinois Spanish Liste des routes d'État en Illinois French
| Illinois Routes | |
|---|---|
   Standard Illinois route markers | |
| System information | |
| Maintained by IDOT, ISTHA, and CDOT | |
| Formed | November 5, 1918[1] |
| Highway names | |
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Route X (US X) |
| State | Illinois Route X (IL X) |
| System links | |
The Illinois Routes are the highways in the State Highway System of the U.S. state of Illinois that are not simultaneously part of the Interstate Highway System or the United States Numbered Highway System. These highways are maintained by the Illinois Department of Transportation (IDOT), with the exception of Illinois Route 390 and parts of Illinois Route 56 and Illinois Route 110, which are maintained by the Illinois State Toll Highway Authority (ISTHA), and all routes that enter the Chicago City Limits are maintained by the Chicago Department of Transportation.
- ^ Carlson, Miriam C. (April 2002). "Out of the Mud: Illinois' Good Roads Movement". Illinois History. 55 (3). Illinois Historic Preservation Agency: 47–9. ISSN 0019-2058. Archived from the original on June 9, 2013. Retrieved April 25, 2014 – via Illinois Periodicals Online.