Phone numbers in Rosalia, Washington
Rosalia has 3 phone prefixes in area code 509.
Biggest holders: Ziply Fiber. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 100%
Every prefix in Rosalia
Search the first six digits of a number in this list. If it's here, the number started in Rosalia with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-478 | Ziply Fiber | Local phone company | – |
| 509-523 | Ziply Fiber | Local phone company | – |
| 509-569 | Ziply Fiber | 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.