Illinois ZIP codes
Main ZIP codes for the largest cities in Illinois. Format: 5-digit ZIP code (ZIP+4 optional).
Cities
| City | Code |
|---|---|
| Chicago | 60601 |
| Springfield | 62701 |
| Aurora | 60505 |
| Naperville | 60540 |
| Peoria | 61602 |
| Rockford | 61101 |
Large cities have many codes; the code shown is the main/central one. All states & countries →