QUEENSTOWN — MD
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| IDT AMERICA, CORP. - MD | 228C | 1 |
| TON80 COMMUNICATIONS, LLC | 516J | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | 1 |
| VERIZON MARYLAND, INC. | 9212 | 1 |