Phone numbers in Williamstown, West Virginia
Williamstown has 4 phone prefixes in area codes 304, 681.
Biggest holders: T-Mobile (including Sprint), Frontier, Csc Voice. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 25%
- Local phone company 25%
- 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 West Virginia page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 304-200 | T-Mobile (including Sprint) | Mobile carrier | – |
| 304-375 | Frontier | Local phone company | – |
| 304-850 | Csc Voice | Internet / business phone carrier | – |
| 681-449 | Level 3 (Lumen) | Internet / business phone carrier | 2023 |
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.