DUNDALK — MD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 5 |
| PAETEC ITEL, LLC | 829J | 4 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 3 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 3 |
| CORE COMMUNICATIONS, INC.- MD | 2593 | 1 |