WSHNGTNZN5 — MD
Data last updated: August 31, 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 |
| ONVOY, LLC - MD | 876D | 5 |