Illinois ZIP Codes
- ZIP codes
- 1,575
- Cities & towns
- 1,286
- Counties
- 102
- Area codes
- 17
How Illinois ZIP codes are numbered
The first three digits identify the sectional center facility that processes mail for a region, so an Illinois ZIP code can be placed geographically from its prefix alone. Each row names the city holding the most codes in that prefix.
| Prefix | ZIP codes | Main area |
|---|---|---|
| 600xx | 82 | Palatine |
| 601xx | 89 | Schaumburg |
| 602xx | 6 | Evanston |
| 603xx | 6 | Oak Park |
| 604xx | 83 | Joliet |
| 605xx | 65 | Aurora |
| 606xx | 83 | Chicago |
| 607xx | 5 | Chicago |
| 608xx | 4 | Alsip |
| 609xx | 57 | Aroma Park |
| 610xx | 66 | Apple River |
| 611xx | 19 | Rockford |
| 612xx | 47 | Rock Island |
| 613xx | 62 | Amboy |
| 614xx | 73 | Galesburg |
| 615xx | 48 | Pekin |
| 616xx | 33 | Peoria |
| 617xx | 60 | Bloomington |
| 618xx | 62 | Champaign |
| 619xx | 30 | Arcola |
| 620xx | 78 | Edwardsville |
| 622xx | 79 | East Saint Louis |
| 623xx | 54 | Quincy |
| 624xx | 61 | Allendale |
| 625xx | 53 | Decatur |
| 626xx | 62 | Jacksonville |
| 627xx | 35 | Springfield |
| 628xx | 90 | Albion |
| 629xx | 83 | Carbondale |
Where Illinois's communities sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Illinois cities by ZIP code count
Area codes serving Illinois
- 217 Springfield
- 224 Chicago
- 309 Peoria
- 312 Chicago
- 331 Chicago
- 447 Springfield
- 464 Chicago
- 618 Belleville
- 630 Chicago
- 708 Chicago
- 730 Belleville
- 773 Chicago
- 779 Joliet
- 815 Joliet
- 847 Chicago
- 861 Peoria
- 872 Chicago
Scope every ZIP code recorded in Illinois. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . The map outline is a convex envelope of published places, not a state boundary.