Phone numbers in Richland, Washington
Richland has 17 phone prefixes in area code 509.
Biggest holders: Ziply Fiber, Onvoy, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 18%
- Local phone company 53%
- Internet / business phone carrier 29%
Every prefix in Richland
Search the first six digits of a number in this list. If it's here, the number started in Richland with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-371 | Ziply Fiber | Local phone company | – |
| 509-372 | Ziply Fiber | Local phone company | – |
| 509-373 | Ziply Fiber | Local phone company | – |
| 509-375 | Ziply Fiber | Local phone company | – |
| 509-376 | Ziply Fiber | Local phone company | – |
| 509-392 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 509-420 | Onvoy | Internet / business phone carrier | – |
| 509-554 | AT&T Mobility | Mobile carrier | 2002 |
| 509-578 | Allstream | Internet / business phone carrier | 2013 |
| 509-604 | Verizon Wireless | Mobile carrier | 2024 |
| 509-713 | Verizon Wireless | Mobile carrier | 2008 |
| 509-827 | MCImetro (Verizon Business) | Internet / business phone carrier | 2018 |
| 509-940 | Onvoy | Internet / business phone carrier | 2001 |
| 509-942 | Ziply Fiber | Local phone company | – |
| 509-943 | Ziply Fiber | Local phone company | – |
| 509-946 | Ziply Fiber | Local phone company | – |
| 509-967 | Ziply Fiber | Local phone company | – |
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.