WSHNGTNZN4 — MD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 35 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | 10 |
| PAETEC ITEL, LLC | 829J | 7 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 4 |
| BANDWIDTH.COM CLEC, LLC - MD | 071F | 3 |