Phone numbers in Watertown, Wisconsin
Watertown has 16 phone prefixes in area code 920.
Biggest holders: AT&T (local phone), UScellular, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 19%
- Internet / business phone carrier 25%
- Paging service 6%
Every prefix in Watertown
Search the first six digits of a number in this list. If it's here, the number started in Watertown with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-206 | AT&T (local phone) | Local phone company | – |
| 920-245 | Teleport Communications America, LLC Wi | Internet / business phone carrier | – |
| 920-248 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 920-253 | UScellular | Mobile carrier | – |
| 920-261 | AT&T (local phone) | Local phone company | – |
| 920-262 | AT&T (local phone) | Local phone company | – |
| 920-285 | AT&T Mobility | Mobile carrier | – |
| 920-342 | Verizon Wireless | Mobile carrier | 2001 |
| 920-390 | AT&T Mobility | Mobile carrier | – |
| 920-545 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 920-567 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 920-679 | Onvoy | Internet / business phone carrier | 2021 |
| 920-900 | UScellular | Mobile carrier | 2023 |
| 920-910 | American Messaging Services | Paging service | – |
| 920-941 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-988 | 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.