Phone numbers in Grandview, Washington
Grandview has 4 phone prefixes in area code 509.
Biggest holders: Level 3 (Lumen), Onvoy, Voip Innovations. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 25%
- Internet / business phone carrier 75%
Every prefix in Grandview
Search the first six digits of a number in this list. If it's here, the number started in Grandview with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-203 | Level 3 (Lumen) | Internet / business phone carrier | 2003 |
| 509-402 | Onvoy | Internet / business phone carrier | – |
| 509-791 | Voip Innovations | Internet / business phone carrier | 2023 |
| 509-882 | CenturyLink / Lumen | 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.