MT VERNON — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 4 |
| T-MOBILE USA, INC. | 6529 | 3 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 3 |
| DELTA COMMS, LLC DBA CLEARWAVE COMMUNICATIONS - IL | 075A | 1 |
| METROPCS, INC. | 5562 | 1 |