Illinois Area Codes
Data last updated: March 10, 2026
Area Codes in Illinois
| NPA | Major Cities | Status | Exchanges | Overlay |
|---|---|---|---|---|
| 217 | Springfield, Champaign, Mattoon | Active | 786 | Yes |
| 224 | Chicago, Elgin, Riverdale | Active | 785 | Yes |
| 309 | Peoria, Bloomington, Macomb | Active | 786 | Yes |
| 312 | Chicago, Elgin, Burr Ridge | Active | 786 | Yes |
| 331 | Chicago, Elgin, Riverdale | Active | 785 | Yes |
| 447 | Champaign, Springfield, Mattoon | Active | 786 | Yes |
| 464 | Chicago, Burr Ridge, Schaumburg | Active | 786 | Yes |
| 618 | Saint Louis, Carbondale, Collinsville | Active | 786 | Yes |
| 630 | Chicago, Elgin, Riverdale | Active | 784 | Yes |
| 708 | Chicago, Elgin, Schaumburg | Active | 786 | Yes |
| 730 | Carbondale, Saint Louis, Collinsville | Active | 786 | Yes |
| 773 | Chicago, Elgin, Riverdale | Active | 786 | Yes |
| 779 | Chicago, Rockford, Dekalb | Active | 786 | Yes |
| 815 | Chicago, Rockford, Dekalb | Active | 786 | Yes |
| 847 | Chicago, Schaumburg, Elgin | Active | 787 | Yes |
| 861 | Illinois | Active | 786 | Yes |
| 872 | Chicago, Elgin, Burr Ridge | Active | 786 | Yes |
Top Carriers in Illinois
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 1915 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 997 |
| T-MOBILE USA, INC. | 6529 | 880 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 629 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 514 |
| ONVOY, LLC | 224C | 469 |
| FRONTIER NORTH, INC. - IL | 1015 | 383 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 306 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 206 |
| PAETEC ITEL, LLC | 829J | 204 |