Phone numbers in Washington, Kansas
Washington has 4 phone prefixes in area code 785.
Biggest holders: AT&T (local phone), Blue Valley Technologies, UScellular. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 25%
- Phone company 25%
Every prefix in Washington
Search the first six digits of a number in this list. If it's here, the number started in Washington with the carrier shown. If it isn't, check the Kansas page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 785-325 | AT&T (local phone) | Local phone company | – |
| 785-510 | Blue Valley Technologies | Phone company | 2009 |
| 785-541 | UScellular | Mobile carrier | – |
| 785-884 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
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.