CARDIFF — MD
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| BANDWIDTH.COM CLEC, LLC - MD | 071F | 1 |
| CORE COMMUNICATIONS, INC.- MD | 2593 | 1 |
| CORETEL MARYLAND, INC. - MD | 469J | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 7325 | 1 |