Phone numbers in Columbus, Wisconsin
Columbus has 5 phone prefixes in area codes 274, 920.
Biggest holders: T-Mobile (including Sprint), Charter / Spectrum, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 20%
- Internet / business phone carrier 40%
Every prefix in Columbus
Search the first six digits of a number in this list. If it's here, the number started in Columbus with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 274-205 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 920-350 | Charter / Spectrum | Internet / business phone carrier | 2005 |
| 920-623 | AT&T (local phone) | Local phone company | – |
| 920-626 | Teleport Communications America, LLC Wi | Internet / business phone carrier | – |
| 920-630 | UScellular | Mobile carrier | – |
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.