CHARLESTON — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 17 |
| ILLINOIS CONSOLIDATED TEL. CO. | 1037 | 4 |
| T-MOBILE USA, INC. | 6529 | 3 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 2 |
| ONVOY, LLC | 224C | 1 |