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 2026 population of 1,185. Hillsdale is currently declining at a rate of -0.25% annually and its population has decreased by -2.47% since the most recent census, which recorded a population of 1,215 in 2020.
The median household income in Hillsdale is $37,583 with a poverty rate of 27.31%. The median age in Hillsdale is 30.6 years: 24.7 years for males, and 34.5 years for females. For every 100 females there are 90.6 males.