Phone numbers in Ontario, Oregon
Ontario has 12 phone prefixes in area codes 458, 541.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 42%
- Internet / business phone carrier 25%
Every prefix in Ontario
Search the first six digits of a number in this list. If it's here, the number started in Ontario with the carrier shown. If it isn't, check the Oregon page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 458-224 | Verizon Wireless | Mobile carrier | – |
| 458-251 | Onvoy | Internet / business phone carrier | 2020 |
| 458-276 | Skyetel | Internet / business phone carrier | 2021 |
| 458-289 | Farmers Mutual Telephone | Local phone company | 2022 |
| 458-446 | Onvoy | Internet / business phone carrier | 2021 |
| 541-212 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 541-216 | UScellular | Mobile carrier | 2004 |
| 541-235 | Farmers Mutual Telephone | Local phone company | – |
| 541-709 | Verizon Wireless | Mobile carrier | 2004 |
| 541-823 | CenturyLink / Lumen | Local phone company | – |
| 541-881 | CenturyLink / Lumen | Local phone company | – |
| 541-889 | CenturyLink / Lumen | 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.