DOWNERSGRV — IL
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 29 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 12 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 7 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 5 |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 4 |