Phone numbers in Maple Valley, Washington
Maple Valley has 11 phone prefixes in area code 425.
Biggest holders: Level 3 (Lumen), CenturyLink / Lumen, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 27%
- Internet / business phone carrier 73%
Every prefix in Maple Valley
Search the first six digits of a number in this list. If it's here, the number started in Maple Valley with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 425-310 | Teleport Communications America | Internet / business phone carrier | – |
| 425-358 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 425-413 | CenturyLink / Lumen | Local phone company | – |
| 425-432 | CenturyLink / Lumen | Local phone company | – |
| 425-433 | CenturyLink / Lumen | Local phone company | – |
| 425-437 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-569 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-578 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 425-584 | Onvoy | Internet / business phone carrier | – |
| 425-660 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-906 | Onvoy | Internet / business phone carrier | – |
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.