EFFINGHAM — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS CONSOLIDATED TEL. CO. | 1037 | 3 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 3 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 2 |
| ONVOY, LLC | 224C | 1 |
| METROPCS, INC. | 5562 | 1 |