Phone numbers in Seymour, Wisconsin
Seymour has 5 phone prefixes in area code 920.
Biggest holders: Cellcom, T-Mobile (including Sprint), Charter / Spectrum. 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 20%
- Phone company 20%
Every prefix in Seymour
Search the first six digits of a number in this list. If it's here, the number started in Seymour with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-228 | Cellcom | Phone company | – |
| 920-259 | T-Mobile (including Sprint) | Mobile carrier | 2008 |
| 920-504 | Charter / Spectrum | Internet / business phone carrier | 2005 |
| 920-595 | Verizon Wireless | Mobile carrier | 2003 |
| 920-833 | Brightspeed Of Central Wisconsin | 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.