Phone numbers in Walla Walla, Washington
Walla Walla has 23 phone prefixes in area code 509.
Biggest holders: CenturyLink / Lumen, T-Mobile (including Sprint), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 48%
- Local phone company 35%
- Internet / business phone carrier 13%
- Phone company 4%
Every prefix in Walla Walla
Search the first six digits of a number in this list. If it's here, the number started in Walla Walla with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-200 | T-Mobile (including Sprint) | Mobile carrier | – |
| 509-204 | Onvoy | Internet / business phone carrier | 2001 |
| 509-240 | AT&T Mobility | Mobile carrier | 2002 |
| 509-301 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 509-360 | Ziply Fiber | Local phone company | 2023 |
| 509-386 | Verizon Wireless | Mobile carrier | – |
| 509-516 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 509-520 | Verizon Wireless | Mobile carrier | – |
| 509-522 | CenturyLink / Lumen | Local phone company | – |
| 509-524 | CenturyLink / Lumen | Local phone company | – |
| 509-525 | CenturyLink / Lumen | Local phone company | – |
| 509-526 | CenturyLink / Lumen | Local phone company | – |
| 509-527 | CenturyLink / Lumen | Local phone company | – |
| 509-529 | CenturyLink / Lumen | Local phone company | – |
| 509-540 | Verizon Wireless | Mobile carrier | – |
| 509-593 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 509-629 | Inland Cellular | Mobile carrier | – |
| 509-676 | Telewise | Phone company | 2005 |
| 509-704 | AT&T Mobility | Mobile carrier | 2024 |
| 509-730 | T-Mobile (including Sprint) | Mobile carrier | 2008 |
| 509-876 | Charter / Spectrum | Internet / business phone carrier | – |
| 509-897 | CenturyLink / Lumen | Local phone company | – |
| 509-956 | MetroPCS (T-Mobile) | Mobile carrier | 2003 |
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.