Phone numbers in Dallas, Oregon
Dallas has 13 phone prefixes in area codes 503, 971.
Biggest holders: CenturyLink / Lumen, T-Mobile (including Sprint), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 23%
- Local phone company 38%
- Internet / business phone carrier 38%
Every prefix in Dallas
Search the first six digits of a number in this list. If it's here, the number started in Dallas with the carrier shown. If it isn't, check the Oregon page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 503-420 | T-Mobile (including Sprint) | Mobile carrier | – |
| 503-606 | CenturyLink / Lumen | Local phone company | – |
| 503-623 | CenturyLink / Lumen | Local phone company | – |
| 503-751 | CenturyLink / Lumen | Local phone company | – |
| 503-831 | CenturyLink / Lumen | Local phone company | – |
| 503-837 | Onvoy | Internet / business phone carrier | – |
| 503-838 | CenturyLink / Lumen | Local phone company | – |
| 503-917 | T-Mobile (including Sprint) | Mobile carrier | – |
| 971-289 | Peerless Network Of Oregon | Internet / business phone carrier | 2018 |
| 971-465 | Fractel | Internet / business phone carrier | 2020 |
| 971-468 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 971-539 | Onvoy | Internet / business phone carrier | 2026 |
| 971-612 | Bandwidth | Internet / business phone carrier | 2015 |
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.