Illinois area codes
The table below lists every active Illinois area code with its coverage, service date and prefix count. 17 of the 17 codes are overlays — added on top of existing territories as numbers ran short.
Geographically the map reads: 217 (Springfield), 618 (Collinsville), 815 (Rockford), 312 (Chicago), 773 (Chicago), 847 (Northbrook), 630 (Roselle), 708 (La Grange), with 8 more codes covering the rest of the state. Each code page lists its full coverage down to individual rate centers.
Overlay territory: 217/447, 224/847, 309/861, 312/872, 331/630 and more — same geography, several codes, ten-digit local dialing.
Recent numbering history: 447 arrived in 2021, 464 arrived in 2022, 861 arrived in 2023, 730 arrived in 2023 — overlays added as existing codes approached exhaust.
Time zone is uniform across the state's codes: Central.
Note that toll-free codes (800, 833, 844, 855, 866, 877, 888) sit outside this list — they have no geographic tie to Illinois or anywhere else, and are assigned individually from the national SMS/800 registry.
As everywhere in the NANP: these codes say where numbers were issued, not where callers are. Per-code pages break coverage down to rate centers and prefixes.
| Code | Major area | In service | Overlay complex | Prefixes |
|---|---|---|---|---|
| 217 | Springfield | 1947 | 217/447 | 786 |
| 224 | Northbrook | 2002 | 224/847 | 588 |
| 309 | Peoria | 1957 | 309/861 | 779 |
| 312 | Chicago | 1947 | 312/872 | 785 |
| 331 | Aurora | 2007 | 331/630 | 221 |
| 447 | Springfield | 2021 | 217/447 | 212 |
| 464 | Oak Forest South | 2022 | 464/708 | 103 |
| 618 | Collinsville | 1947 | 618/730 | 786 |
| 630 | Roselle | 1996 | 331/630 | 783 |
| 708 | La Grange | 1989 | 464/708 | 783 |
| 730 | Centralia | 2023 | 618/730 | 119 |
| 773 | Chicago | 1996 | 773/872 | 785 |
| 779 | Rockford | 2007 | 779/815 | 344 |
| 815 | Rockford | 1947 | 779/815 | 786 |
| 847 | Northbrook | 1996 | 224/847 | 785 |
| 861 | — | 2023 | 309/861 | — |
| 872 | Chicago | 2009 | 312/872 | 272 |
FAQ
How many area codes does Illinois have?
17 geographic area codes are currently in service: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872.
What was Illinois's first area code?
217, in service since 1947.
Will Illinois get a new area code soon?
Not soon. The earliest exhaust forecast in the state is 224 at 3Q 2033, so current codes have ample capacity.
Which time zone are Illinois numbers in?
All Illinois area codes are in the Central time zone.