BALTIMORE — MD
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 128 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | 97 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | 85 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 38 |
| PAETEC ITEL, LLC | 829J | 15 |