Illinois Area Codes
14 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 |
| 464 | Chicago South Suburbs (overlay for 708) | Chicago |
| 730 | Southern Illinois (overlay for 618) | South |
About Illinois Area Codes
Illinois uses 14 area codes under the North American Numbering Plan (NANP), serving Carbondale, Champaign, Chicago (downtown), Chicago (outer), Chicago North Suburbs, Chicago South Suburbs and 7 other communities. Each code follows the 3-digit format and covers a defined geographic region within the state.
Overlay Codes in Illinois
Illinois has adopted 5 overlay code(s): 224, 331, 872, 464, 730. An overlay assigns a new area code to the same geographic region as an existing code, so both codes serve the same area. When overlay codes are active, callers must dial all 10 digits (area code + number) even for local calls within the same region.
Major Cities and Their Area Codes
Find which area code serves each major city in Illinois.
| City / Community | Area Code(s) |
|---|---|
| Carbondale | 618 |
| Champaign | 217 |
| Chicago (downtown) | 312 |
| Chicago (outer) | 773 |
| Chicago North Suburbs | 847 |
| Chicago South Suburbs | 708 |
| Chicago West Suburbs | 630 |
| East St. Louis | 618 |
| Joliet | 815 |
| Moline | 309 |
| Peoria | 309 |
| Rockford | 815 |
| Springfield | 217 |
How to Call Illinois
Within the US: dial 1 + area code + 7-digit number (10-digit dialing applies where overlays are active).
From Canada or the Caribbean: the same NANP format applies — 1 + area code + number.
From abroad: dial your country's exit code (011 from the US, 00 from most countries, or + on mobile), then 1, then the Illinois area code and number.
Example (from the UK): 00 1 217 XXX XXXX
Data source: North American Numbering Plan Administration (NANPA), ITU-T E.164. Area code assignments change with new overlays — verify with your carrier before dialing. NANPA