REISTERSTN — MD
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 6 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | 3 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 2 |
| METROPCS, INC. | 5562 | 2 |
| PAETEC ITEL, LLC | 829J | 2 |