Phone numbers in Grass Valley, Oregon
Grass Valley has 3 phone prefixes in area codes 458, 541.
Biggest holders: TON80 Communications, CenturyLink / Lumen, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in Grass Valley
Search the first six digits of a number in this list. If it's here, the number started in Grass Valley with the carrier shown. If it isn't, check the Oregon page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 458-746 | TON80 Communications | Internet / business phone carrier | 2022 |
| 541-333 | CenturyLink / Lumen | Local phone company | – |
| 541-394 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
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.