Phone numbers in Silverlake, Washington
Silverlake has 17 phone prefixes in area code 425.
Biggest holders: Ziply Fiber, Level 3 (Lumen), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 6%
- Local phone company 35%
- Internet / business phone carrier 53%
- Phone company 6%
Every prefix in Silverlake
Search the first six digits of a number in this list. If it's here, the number started in Silverlake with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 425-224 | Allstream | Internet / business phone carrier | – |
| 425-225 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-316 | Ziply Fiber | Local phone company | – |
| 425-321 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-332 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 425-337 | Ziply Fiber | Local phone company | – |
| 425-338 | Ziply Fiber | Local phone company | – |
| 425-341 | Allstream | Internet / business phone carrier | 2002 |
| 425-357 | Ziply Fiber | Local phone company | – |
| 425-379 | Ziply Fiber | Local phone company | – |
| 425-385 | Ziply Fiber | Local phone company | – |
| 425-399 | Onvoy | Internet / business phone carrier | – |
| 425-552 | Onvoy | Internet / business phone carrier | 2022 |
| 425-581 | AT&T Mobility | Mobile carrier | 2025 |
| 425-585 | Wide Voice | Phone company | – |
| 425-669 | Onvoy | Internet / business phone carrier | – |
| 425-948 | Level 3 (Lumen) | 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.