Phone numbers in Seaside, Oregon
Seaside has 10 phone prefixes in area codes 503, 971.
Biggest holders: T-Mobile (including Sprint), Verizon Wireless, CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 80%
- Local phone company 20%
Every prefix in Seaside
Search the first six digits of a number in this list. If it's here, the number started in Seaside with the carrier shown. If it isn't, check the Oregon page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 503-440 | Verizon Wireless | Mobile carrier | – |
| 503-470 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 503-717 | CenturyLink / Lumen | Local phone company | – |
| 503-738 | CenturyLink / Lumen | Local phone company | – |
| 503-739 | AT&T Mobility | Mobile carrier | – |
| 971-320 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 971-326 | Verizon Wireless | Mobile carrier | 2018 |
| 971-395 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 971-475 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 971-601 | Verizon Wireless | Mobile carrier | 2014 |
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.