Phone numbers in Oskaloosa, Iowa
Oskaloosa has 12 phone prefixes in area code 641.
Biggest holders: UScellular, T-Mobile (including Sprint), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 58%
- Local phone company 17%
- Internet / business phone carrier 17%
- Phone company 8%
Every prefix in Oskaloosa
Search the first six digits of a number in this list. If it's here, the number started in Oskaloosa with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 641-215 | Telnyx | Internet / business phone carrier | – |
| 641-295 | UScellular | Mobile carrier | 2002 |
| 641-504 | T-Mobile (including Sprint) | Mobile carrier | – |
| 641-517 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 641-569 | AT&T Mobility | Mobile carrier | 2001 |
| 641-638 | Verizon Wireless | Mobile carrier | – |
| 641-660 | UScellular | Mobile carrier | – |
| 641-670 | Verizon Wireless | Mobile carrier | – |
| 641-672 | CenturyLink / Lumen | Local phone company | – |
| 641-673 | CenturyLink / Lumen | Local phone company | – |
| 641-676 | Mahaska Communication Group | Phone company | 2003 |
| 641-810 | IP Horizon | Internet / business phone carrier | 2025 |
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.