Phone numbers in Fond du Lac, Wisconsin
Fond du Lac has 34 phone prefixes in area code 920.
Biggest holders: AT&T (local phone), UScellular, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 44%
- Local phone company 26%
- Internet / business phone carrier 15%
- Paging service 6%
- Phone company 9%
Every prefix in Fond du Lac
Search the first six digits of a number in this list. If it's here, the number started in Fond du Lac with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-204 | Verizon Wireless | Mobile carrier | – |
| 920-238 | UScellular | Mobile carrier | – |
| 920-251 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-263 | Cellcom | Phone company | – |
| 920-266 | AT&T (local phone) | Local phone company | – |
| 920-273 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 920-322 | TDS Metrocom | Phone company | – |
| 920-375 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-517 | Verizon Wireless | Mobile carrier | – |
| 920-539 | Verizon Wireless | Mobile carrier | – |
| 920-579 | Verizon Wireless | Mobile carrier | – |
| 920-581 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 920-602 | AT&T Mobility | Mobile carrier | 2001 |
| 920-638 | Teleport Communications America, LLC Wi | Internet / business phone carrier | – |
| 920-736 | Spok | Paging service | – |
| 920-801 | American Messaging Services | Paging service | – |
| 920-812 | Boost / Virgin Mobile | Mobile carrier | 2021 |
| 920-904 | UScellular | Mobile carrier | – |
| 920-906 | AT&T (local phone) | Local phone company | – |
| 920-907 | AT&T (local phone) | Local phone company | – |
| 920-913 | TDS Metrocom | Phone company | – |
| 920-921 | AT&T (local phone) | Local phone company | – |
| 920-922 | AT&T (local phone) | Local phone company | – |
| 920-923 | AT&T (local phone) | Local phone company | – |
| 920-924 | AT&T (local phone) | Local phone company | – |
| 920-926 | AT&T (local phone) | Local phone company | – |
| 920-929 | AT&T (local phone) | Local phone company | – |
| 920-933 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 920-948 | UScellular | Mobile carrier | – |
| 920-952 | Teleport Communications America, LLC Wi | Internet / business phone carrier | 2007 |
| 920-957 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 920-960 | UScellular | Mobile carrier | – |
| 920-970 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 920-979 | 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.