Phone numbers in Middlefield, Ohio
Middlefield has 4 phone prefixes in area code 440.
Biggest holders: Level 3 (Lumen), Windstream Western Reserve, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 25%
- Local phone company 25%
- Internet / business phone carrier 50%
Every prefix in Middlefield
Search the first six digits of a number in this list. If it's here, the number started in Middlefield with the carrier shown. If it isn't, check the Ohio page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 440-426 | Level 3 (Lumen) | Internet / business phone carrier | 2013 |
| 440-632 | Windstream Western Reserve | Local phone company | – |
| 440-705 | Onvoy | Internet / business phone carrier | 2021 |
| 440-881 | MetroPCS (T-Mobile) | Mobile carrier | 2022 |
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.