Phone numbers in Pasco, Washington
Pasco has 26 phone prefixes in area code 509.
Biggest holders: AT&T Mobility, CenturyLink / Lumen, MetroPCS (T-Mobile). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 23%
- Internet / business phone carrier 27%
Every prefix in Pasco
Search the first six digits of a number in this list. If it's here, the number started in Pasco with the carrier shown. If it isn't, check the Washington page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 509-302 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 509-316 | Bandwidth | Internet / business phone carrier | 2014 |
| 509-380 | Charter / Spectrum | Internet / business phone carrier | 2007 |
| 509-410 | Onvoy | Internet / business phone carrier | 2020 |
| 509-412 | MetroPCS (T-Mobile) | Mobile carrier | 2011 |
| 509-416 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 509-430 | AT&T Mobility | Mobile carrier | – |
| 509-492 | AT&T Mobility | Mobile carrier | – |
| 509-521 | AT&T Mobility | Mobile carrier | – |
| 509-528 | AT&T Mobility | Mobile carrier | – |
| 509-531 | AT&T Mobility | Mobile carrier | – |
| 509-537 | Onvoy | Internet / business phone carrier | 2001 |
| 509-539 | AT&T Mobility | Mobile carrier | – |
| 509-542 | CenturyLink / Lumen | Local phone company | – |
| 509-543 | CenturyLink / Lumen | Local phone company | – |
| 509-544 | CenturyLink / Lumen | Local phone company | – |
| 509-545 | CenturyLink / Lumen | Local phone company | – |
| 509-546 | CenturyLink / Lumen | Local phone company | – |
| 509-547 | CenturyLink / Lumen | Local phone company | – |
| 509-567 | Charter / Spectrum | Internet / business phone carrier | 2013 |
| 509-709 | AT&T Mobility | Mobile carrier | 2025 |
| 509-792 | Verizon Wireless | Mobile carrier | 2013 |
| 509-845 | AT&T Mobility | Mobile carrier | 2002 |
| 509-851 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 509-905 | Level 3 (Lumen) | Internet / business phone carrier | 2019 |
| 509-975 | Verizon Wireless | Mobile carrier | 2019 |
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.