Phone numbers in Beaver Dam, Wisconsin
Beaver Dam has 19 phone prefixes in area code 920.
Biggest holders: UScellular, Verizon Wireless, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 58%
- Local phone company 16%
- Internet / business phone carrier 16%
- Paging service 5%
- Phone company 5%
Every prefix in Beaver Dam
Search the first six digits of a number in this list. If it's here, the number started in Beaver Dam with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-210 | UScellular | Mobile carrier | – |
| 920-219 | Verizon Wireless | Mobile carrier | – |
| 920-296 | UScellular | Mobile carrier | – |
| 920-306 | Verizon Wireless | Mobile carrier | – |
| 920-317 | American Messaging Services | Paging service | – |
| 920-318 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-319 | AT&T Mobility | Mobile carrier | – |
| 920-344 | Verizon Wireless | Mobile carrier | 2001 |
| 920-356 | AT&T (local phone) | Local phone company | – |
| 920-382 | UScellular | Mobile carrier | 2002 |
| 920-392 | Verizon Wireless | Mobile carrier | – |
| 920-557 | Teleport Communications America, LLC Wi | Internet / business phone carrier | 2010 |
| 920-631 | AT&T Enterprises | Phone company | 2010 |
| 920-763 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 920-791 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-820 | UScellular | Mobile carrier | – |
| 920-821 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 920-885 | AT&T (local phone) | Local phone company | – |
| 920-887 | AT&T (local phone) | 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.