ROCKFORD — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 37 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 14 |
| T-MOBILE USA, INC. | 6529 | 13 |
| UNITED STATES CELLULAR - IL | 6265 | 11 |
| ONVOY, LLC | 224C | 8 |