CATONSVL — MD
Data last updated: October 30, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 43 |
| VERIZON MARYLAND, INC. | 9212 | 7 |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | 6 |
| PAETEC ITEL, LLC | 829J | 4 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 2 |