WSHNGTNZN5 — MD
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 29 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | 6 |
| METROPCS, INC. | 5562 | 5 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 5 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | 4 |