CASTLEROCK — AZ
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL | 2172 | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | 1 |
| ONVOY, LLC - AZ | 630E | 1 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | 1 |
| FRACTEL, LLC | 965H | 1 |