Wellston
- County:
- St. Louis County
- County Seat:
- No
- Area (mi²):
- 0.932
- State:
- Missouri
Wellston is a city located in St. Louis County, Missouri. Wellston has a 2026 population of 1,590. Wellston is currently declining at a rate of 0% annually and its population has increased by 3.52% since the most recent census, which recorded a population of 1,536 in 2020.
The median household income in Wellston is $44,957 with a poverty rate of 35.44%. The median age in Wellston is 48.1 years: 43.6 years for males, and 48.3 years for females. For every 100 females there are 78.7 males.