HOLLY OAK — DE
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON DELAWARE, INC. | 9210 | 7 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 4 |
| PAETEC ITEL, LLC | 829J | 4 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | 2 |
| ONVOY, LLC - DE | 969E | 2 |