Williamson
- County:
- Mingo County
- County Seat:
- No
- Area (mi²):
- 3.275
- State:
- West Virginia
Williamson is a city located in Mingo County, West Virginia. Williamson has a 2026 population of 2,779. Williamson is currently declining at a rate of -1.77% annually and its population has decreased by -9.36% since the most recent census, which recorded a population of 3,066 in 2020.