BIG ROCK — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 2 |
| ONVOY, LLC | 224C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 1 |
| RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | 1 |