Phone numbers in Ephrata, Washington
Ephrata has 8 phone prefixes in area code 509.
Biggest holders: AT&T Mobility, Verizon Wireless, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 75%
- Local phone company 12%
- Phone company 12%
Every prefix in Ephrata
Search the first six digits of a number in this list. If it's here, the number started in Ephrata with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-237 | AT&T Mobility | Mobile carrier | 2002 |
| 509-289 | T-Mobile (including Sprint) | Mobile carrier | – |
| 509-398 | AT&T Mobility | Mobile carrier | 2002 |
| 509-450 | AT&T Mobility | Mobile carrier | 2020 |
| 509-702 | Verizon Wireless | Mobile carrier | 2025 |
| 509-717 | Localtel | Phone company | 2001 |
| 509-754 | CenturyLink / Lumen | Local phone company | – |
| 509-906 | Verizon Wireless | Mobile carrier | 2018 |
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.