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Illinois Area Codes
Illinois has 17 area codes in service: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861 and 872.
Largest cities
| City | Area codes |
|---|---|
| Chicago | 773, 312, 872 |
| Aurora | 630, 331 |
| Naperville | 630, 331 |
| Joliet | 815, 779 |
| Rockford | 815, 779 |
| Elgin | 224, 847 |
| Springfield | 217, 447 |
| Peoria | 309, 861 |
| Champaign | 217, 447 |
| Waukegan | 224, 847 |
| Cicero | 708, 464 |
| Bloomington | 309 |
All area codes in Illinois
| Code | Main cities | Overlay | In service since | Projected exhaust |
|---|---|---|---|---|
| 217 | Springfield, Champaign, Decatur, Urbana | 447 | 1947 | 2046 |
| 224 | Elgin, Waukegan, Schaumburg, Evanston | 847 | 2002 | 2033 |
| 309 | Peoria, Bloomington, Normal, Moline | 861 | 1957 | 2102 |
| 312 | Chicago, Buffalo Grove, Wheeling, Prospect Heights | 872 | 1947 | 2049 |
| 331 | Aurora, Naperville, Schaumburg, Bolingbrook | 630 | 2007 | 2080 |
| 447 | Springfield, Champaign, Decatur, Urbana | 217 | 2021 | 2046 |
| 464 | Cicero, Orland Park, Oak Lawn, Tinley Park | 708 | 2022 | 2053 |
| 618 | Belleville, Carpentersville, O'Fallon, Granite City | 730 | 1947 | 2040 |
| 630 | Aurora, Naperville, Schaumburg, Bolingbrook | 331 | 1996 | 2080 |
| 708 | Cicero, Schaumburg, Orland Park, Oak Lawn | 464 | 1989 | 2053 |
| 730 | Belleville, O'Fallon, Granite City, Alton | 618 | 2023 | 2040 |
| 773 | Chicago | 872 | 1996 | 2046 |
| 779 | Joliet, Rockford, Plainfield, Crystal Lake | 815 | 2007 | 2044 |
| 815 | Joliet, Rockford, Plainfield, Crystal Lake | 779 | 1947 | 2044 |
| 847 | Elgin, Waukegan, Schaumburg, Evanston | 224 | 1996 | 2033 |
| 861 | Peoria, Moline, Rock Island, Pekin | 309 | 2023 | 2102 |
| 872 | Chicago | 312, 872, 773 | 2009 | 2046 |
8,988 prefixes are in use across Illinois. Exhaust years are NANPA's 2026 forecast.