DEFIANCE — OH
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| BRIGHTSPEED OF NORTHWEST OHIO, INC. | 0661 | 4 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | 3 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 2 |
| QUALSTAR COMMUNICATIONS, INC. - OH | 2094 | 1 |
| OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | 1 |