CASPER — WY
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| QWEST CORPORATION | 9636 | 14 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | 6 |
| UNION TELEPHONE COMPANY | 013B | 3 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 3 |
| LEVEL 3 COMMUNICATIONS, LLC - WY | 9416 | 3 |