Phone numbers in Oelwein, Iowa
Oelwein has 7 phone prefixes in area code 319.
Biggest holders: Onvoy, UScellular, CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 43%
- Local phone company 14%
- Internet / business phone carrier 29%
- Phone company 14%
Every prefix in Oelwein
Search the first six digits of a number in this list. If it's here, the number started in Oelwein with the carrier shown. If it isn't, check the Iowa page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 319-238 | Onvoy | Internet / business phone carrier | 2004 |
| 319-264 | UScellular | Mobile carrier | 2017 |
| 319-283 | CenturyLink / Lumen | Local phone company | – |
| 319-284 | Bandwidth | Internet / business phone carrier | – |
| 319-323 | AT&T Mobility | Mobile carrier | 2020 |
| 319-410 | Aureon Communications | Phone company | 2021 |
| 319-509 | T-Mobile (including Sprint) | 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.