Phone numbers in Hartford, Ohio
Hartford has 3 phone prefixes in area codes 234, 330.
Biggest holders: Onvoy, Brightspeed Of Northwest Ohio. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in Hartford
Search the first six digits of a number in this list. If it's here, the number started in Hartford with the carrier shown. If it isn't, check the Ohio page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 234-306 | Onvoy | Internet / business phone carrier | 2021 |
| 330-443 | Onvoy | Internet / business phone carrier | 2018 |
| 330-772 | Brightspeed Of Northwest Ohio | Local phone company | – |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.