Phone numbers in Kennewick, Washington
Kennewick has 42 phone prefixes in area code 509.
Biggest holders: Ziply Fiber, T-Mobile (including Sprint), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 45%
- Local phone company 33%
- Internet / business phone carrier 21%
Every prefix in Kennewick
Search the first six digits of a number in this list. If it's here, the number started in Kennewick with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-205 | T-Mobile (including Sprint) | Mobile carrier | 2003 |
| 509-212 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 509-221 | Ziply Fiber | Local phone company | 2013 |
| 509-222 | Ziply Fiber | Local phone company | – |
| 509-231 | Onvoy | Internet / business phone carrier | – |
| 509-308 | T-Mobile (including Sprint) | Mobile carrier | – |
| 509-366 | UScellular | Mobile carrier | – |
| 509-374 | Ziply Fiber | Local phone company | – |
| 509-378 | Verizon Wireless | Mobile carrier | – |
| 509-396 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 509-405 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 509-438 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 509-440 | T-Mobile (including Sprint) | Mobile carrier | 2009 |
| 509-460 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 509-491 | Teleport Communications America | Internet / business phone carrier | 2012 |
| 509-518 | Onvoy | Internet / business phone carrier | – |
| 509-551 | AT&T Mobility | Mobile carrier | 2002 |
| 509-572 | Verizon Wireless | Mobile carrier | – |
| 509-579 | CenturyLink / Lumen | Local phone company | – |
| 509-581 | Onvoy | Internet / business phone carrier | 2001 |
| 509-582 | Ziply Fiber | Local phone company | – |
| 509-585 | Ziply Fiber | Local phone company | – |
| 509-586 | Ziply Fiber | Local phone company | – |
| 509-591 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 509-614 | Verizon Wireless | Mobile carrier | 2024 |
| 509-619 | Charter / Spectrum | Internet / business phone carrier | 2007 |
| 509-627 | Ziply Fiber | Local phone company | – |
| 509-628 | Ziply Fiber | Local phone company | – |
| 509-706 | AT&T Mobility | Mobile carrier | 2025 |
| 509-727 | T-Mobile (including Sprint) | Mobile carrier | – |
| 509-734 | Ziply Fiber | Local phone company | – |
| 509-735 | Ziply Fiber | Local phone company | – |
| 509-736 | Ziply Fiber | Local phone company | – |
| 509-737 | Ziply Fiber | Local phone company | – |
| 509-783 | Ziply Fiber | Local phone company | – |
| 509-802 | Skyetel | Internet / business phone carrier | – |
| 509-820 | Verizon Wireless | Mobile carrier | 2014 |
| 509-870 | Onvoy | Internet / business phone carrier | – |
| 509-873 | AT&T Mobility | Mobile carrier | 2018 |
| 509-947 | UScellular | Mobile carrier | – |
| 509-948 | UScellular | Mobile carrier | – |
| 509-987 | UScellular | Mobile 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.