Phone numbers in Oshkosh, Wisconsin
Oshkosh has 40 phone prefixes in area code 920.
Biggest holders: AT&T (local phone), Verizon Wireless, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 35%
- Local phone company 30%
- Internet / business phone carrier 18%
- Paging service 8%
- Phone company 10%
Every prefix in Oshkosh
Search the first six digits of a number in this list. If it's here, the number started in Oshkosh with the carrier shown. If it isn't, check the Wisconsin page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 920-203 | T-Mobile (including Sprint) | Mobile carrier | – |
| 920-216 | AT&T Mobility | Mobile carrier | 2001 |
| 920-223 | AT&T (local phone) | Local phone company | – |
| 920-230 | Northern Telephone And Data | Phone company | 2001 |
| 920-231 | AT&T (local phone) | Local phone company | – |
| 920-232 | AT&T (local phone) | Local phone company | – |
| 920-233 | AT&T (local phone) | Local phone company | – |
| 920-235 | AT&T (local phone) | Local phone company | – |
| 920-236 | AT&T (local phone) | Local phone company | – |
| 920-237 | AT&T (local phone) | Local phone company | – |
| 920-252 | Verizon Wireless | Mobile carrier | 2001 |
| 920-258 | Spok | Paging service | – |
| 920-267 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 920-279 | Verizon Wireless | Mobile carrier | – |
| 920-292 | TDS Metrocom | Phone company | – |
| 920-303 | AT&T (local phone) | Local phone company | – |
| 920-312 | Verizon Wireless | Mobile carrier | – |
| 920-376 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 920-379 | Verizon Wireless | Mobile carrier | – |
| 920-385 | Charter / Spectrum | Internet / business phone carrier | 2002 |
| 920-410 | UScellular | Mobile carrier | – |
| 920-420 | UScellular | Mobile carrier | – |
| 920-424 | AT&T (local phone) | Local phone company | – |
| 920-426 | AT&T (local phone) | Local phone company | – |
| 920-456 | AT&T (local phone) | Local phone company | 2002 |
| 920-479 | Verizon Wireless | Mobile carrier | – |
| 920-500 | Boost / Virgin Mobile | Mobile carrier | 2023 |
| 920-509 | Verizon Wireless | Mobile carrier | – |
| 920-527 | AT&T (local phone) | Local phone company | – |
| 920-573 | Verizon Wireless | Mobile carrier | 2003 |
| 920-580 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 920-642 | Cellcom | Phone company | – |
| 920-651 | TDS Metrocom | Phone company | – |
| 920-703 | American Messaging Services | Paging service | – |
| 920-718 | Onvoy | Internet / business phone carrier | – |
| 920-744 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 920-808 | Peerless Network Of Wisconsin | Internet / business phone carrier | 2018 |
| 920-891 | Teleport Communications America, LLC Wi | Internet / business phone carrier | 2007 |
| 920-902 | American Messaging Services | Paging service | – |
| 920-966 | Windstream (PAETEC) | Internet / business phone 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.