West Alton
- County:
- St. Charles County
- County Seat:
- No
- Area (mi²):
- 28.812
- State:
- Missouri
West Alton is a city located in St. Charles County, Missouri. West Alton has a 2026 population of 353. West Alton is currently growing at a rate of 0.28% annually but its population has decreased by -0.84% since the most recent census, which recorded a population of 356 in 2020.
The median household income in West Alton is $111,500 with a poverty rate of 1.71%. The median age in West Alton is 36.5 years: 38.2 years for males, and 31.5 years for females. For every 100 females there are 93.0 males.