Phone numbers in Williamstown, Kentucky
Williamstown has 8 phone prefixes in area code 859.
Biggest holders: Cincinnati Bell, Onvoy, Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 38%
- Internet / business phone carrier 50%
Every prefix in Williamstown
Search the first six digits of a number in this list. If it's here, the number started in Williamstown with the carrier shown. If it isn't, check the Kentucky page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 859-242 | Verizon Wireless | Mobile carrier | 2002 |
| 859-428 | Cincinnati Bell | Local phone company | – |
| 859-666 | Onvoy | Internet / business phone carrier | 2017 |
| 859-813 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 859-823 | Cincinnati Bell | Local phone company | – |
| 859-824 | Cincinnati Bell | Local phone company | – |
| 859-903 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 859-997 | Onvoy | Internet / business phone carrier | 2001 |
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.