Illinois Area Codes
12 area codes in Illinois, United States. Country code: +1. Find area codes by city and region.
All Illinois Area Codes
| Area Code | Major Cities | Region |
|---|---|---|
| 217 | Springfield, Champaign | Central |
| 224 | Chicago North Suburbs (overlay) | Northeast |
| 309 | Peoria, Moline | West Central |
| 312 | Chicago (downtown) | Chicago |
| 331 | Chicago West Suburbs (overlay) | Chicago |
| 618 | East St. Louis, Carbondale | South |
| 630 | Chicago West Suburbs | Chicago |
| 708 | Chicago South Suburbs | Chicago |
| 773 | Chicago (outer) | Chicago |
| 815 | Rockford, Joliet | North |
| 847 | Chicago North Suburbs | Northeast |
| 872 | Chicago (overlay) | Chicago |
About Illinois Area Codes
Illinois uses 12 area codes under the North American Numbering Plan (NANP). When calling within Illinois, dial the 3-digit area code followed by the 7-digit phone number. From abroad: exit code + 1 + area code + number.