Phone numbers in Oakfield, Wisconsin
Oakfield has 3 phone prefixes in area codes 274, 920.
Biggest holders: Terra Nova Telecom, Frontier, UScellular. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 33%
- Internet / business phone carrier 33%
Every prefix in Oakfield
Search the first six digits of a number in this list. If it's here, the number started in Oakfield with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 274-226 | Terra Nova Telecom | Internet / business phone carrier | 2025 |
| 920-583 | Frontier | Local phone company | – |
| 920-937 | UScellular | Mobile carrier | 2018 |
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.