HIGHLANDPK — IL
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ILLINOIS BELL TEL CO | 9329 | 8 |
| ONVOY, LLC | 224C | 1 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1 |