Phone numbers in Williams Bay, Wisconsin
Williams Bay has 5 phone prefixes in area code 262.
Biggest holders: Onvoy, AT&T (local phone), UScellular. 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 Williams Bay
Search the first six digits of a number in this list. If it's here, the number started in Williams Bay with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 262-205 | Onvoy | Internet / business phone carrier | 2016 |
| 262-245 | AT&T (local phone) | Local phone company | – |
| 262-607 | UScellular | Mobile carrier | 2002 |
| 262-686 | Teleport Communications America, LLC Wi | Internet / business phone carrier | – |
| 262-892 | Onvoy | Internet / business phone carrier | 2021 |
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.