WESTMINSTR — MD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | 6 |
| VERIZON MARYLAND, INC. | 9212 | 6 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 3 |
| METROPCS, INC. | 5562 | 2 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | 2 |