WATERLO236 — MD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 19 |
| ONVOY, LLC - MD | 876D | 3 |
| BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | 2 |
| AMERICAN MESSAGING SERVICES, LLC | 9748 | 2 |
| BANDWIDTH.COM CLEC, LLC - MD | 071F | 1 |