Phone numbers in Issaquah, Washington
Issaquah has 34 phone prefixes in area code 425.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 24%
- Internet / business phone carrier 47%
Every prefix in Issaquah
Search the first six digits of a number in this list. If it's here, the number started in Issaquah with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 425-200 | Verizon Wireless | Mobile carrier | 2001 |
| 425-270 | Allstream | Internet / business phone carrier | – |
| 425-281 | AT&T Mobility | Mobile carrier | – |
| 425-295 | Allstream | Internet / business phone carrier | 2001 |
| 425-313 | CenturyLink / Lumen | Local phone company | – |
| 425-331 | Verizon Wireless | Mobile carrier | 2020 |
| 425-340 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 425-369 | CenturyLink / Lumen | Local phone company | – |
| 425-391 | CenturyLink / Lumen | Local phone company | – |
| 425-392 | CenturyLink / Lumen | Local phone company | – |
| 425-394 | CenturyLink / Lumen | Local phone company | – |
| 425-395 | Allstream | Internet / business phone carrier | 2001 |
| 425-414 | Verizon Wireless | Mobile carrier | 2018 |
| 425-416 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 425-427 | CenturyLink / Lumen | Local phone company | – |
| 425-428 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 425-465 | T-Mobile (including Sprint) | Mobile carrier | 2020 |
| 425-477 | Vonage America | Internet / business phone carrier | 2020 |
| 425-494 | T-Mobile (including Sprint) | Mobile carrier | 2020 |
| 425-507 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 425-526 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 425-557 | CenturyLink / Lumen | Local phone company | – |
| 425-571 | AT&T Mobility | Mobile carrier | 2024 |
| 425-600 | Fractel | Internet / business phone carrier | 2021 |
| 425-606 | Verizon Wireless | Mobile carrier | – |
| 425-642 | Onvoy | Internet / business phone carrier | – |
| 425-651 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-654 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 425-657 | Teleport Communications America | Internet / business phone carrier | – |
| 425-677 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 425-832 | TON80 Communications | Internet / business phone carrier | 2022 |
| 425-837 | CenturyLink / Lumen | Local phone company | – |
| 425-961 | Teleport Communications America | Internet / business phone carrier | 2001 |
| 425-996 | 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.