[The federally–designated routes on the National Network consist of the Interstate System, except as noted, and the following additional Federal–aid Primary highways]
| Route | From | To |
|---|
| US 20 | US 20 BR W. of Rockford | I–39 Rockford. |
| US 36 | IL 100 NW. of Winchester | I–55 Springfield. |
| US 50 | US 50 BR E. of Lawrenceville | IN State Line. |
| US 51 | US 51 BR S. of Decatur | I–72 Decatur. |
| US 67 | IL 92 Rock Island | IA State Line. |
| IL 6 | I–74/474 Peoria | IL 88 N. of Peoria. |
| IL 53 | Army Trail Rd. Addison | IL 68 Arlington Heights. |
| IL 92 | I–280 Rock Island | US 67 Rock Island. |
| IL 336 | IL 57 Fall Creek | US 24 NE. of Quincy. |
| IL 394 | IL 1 Goodenow | I–80/94/294 S. Holland. |
| IL Toll Hwys | All Routes | |
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