Phone numbers in Horicon, Wisconsin
Horicon has 5 phone prefixes in area code 920.
Biggest holders: AT&T (local phone), Onvoy, Teleport Communications America, LLC Wi. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 20%
- Internet / business phone carrier 60%
Every prefix in Horicon
Search the first six digits of a number in this list. If it's here, the number started in Horicon with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-485 | AT&T (local phone) | Local phone company | – |
| 920-537 | Onvoy | Internet / business phone carrier | 2021 |
| 920-643 | Teleport Communications America, LLC Wi | Internet / business phone carrier | 2002 |
| 920-786 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-908 | Commio | Internet / business phone carrier | 2023 |
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.