OAKLAND — MD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 4 |
| BANDWIDTH.COM CLEC, LLC - MD | 071F | 2 |
| USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | 4720 | 2 |
| ONVOY, LLC - MD | 876D | 2 |
| CORE COMMUNICATIONS, INC.- MD | 2593 | 1 |