CHATHAM — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 2 |
| FRONTIER NORTH, INC. - IL | 1015 | 1 |
| TON80 COMMUNICATIONS, LLC | 516J | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 1 |
| COMMIO, LLC | 939H | 1 |