
Hillsdale
- County:
- St. Louis County
- County Seat:
- No
- Area (mi²):
- 0.342
- State:
- Missouri
Hillsdale is a village located in St. Louis County, Missouri. Hillsdale has a 2025 population of 1,159. Hillsdale is currently declining at a rate of -0.94% annually and its population has decreased by -4.45% since the most recent census, which recorded a population of 1,213 in 2020.
The average household income in Hillsdale is $42,763 with a poverty rate of 27.32%. The median age in Hillsdale is 26.6 years: 24.3 years for males, and 30.3 years for females.