MARLBORO — MA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| VERIZON NEW ENGLAND INC. | 9102 | 14 |
| PAETEC ITEL, LLC | 829J | 5 |
| TC SYSTEMS, INC. | 7135 | 4 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 4 |
| LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | 3 |