Williamsville
- County:
- Wayne County
- County Seat:
- No
- Area (mi²):
- 0.323
- State:
- Missouri
Williamsville is a city located in Wayne County, Missouri. Williamsville has a 2026 population of 272. Williamsville is currently declining at a rate of 0% annually and its population has decreased by -1.09% since the most recent census, which recorded a population of 275 in 2020.
The median household income in Williamsville is $30,625 with a poverty rate of 38.03%. The median age in Williamsville is 40.7 years: 44 years for males, and 40.1 years for females. For every 100 females there are 105.8 males.