Hillsdale
- County:
- Faulk County
- County Seat:
- No
- Area (mi²):
- 35.519
- State:
- South Dakota
Hillsdale is located in Faulk County, South Dakota. Hillsdale has a 2025 population of 58 . Hillsdale is currently declining at a rate of 0% annually and its population has increased by 3.57% since the most recent census, which recorded a population of 56 in 2020.
The median age in Hillsdale is 11.8 years: 12.2 years for males, and 11.7 years for females. For every 100 females there are 110.0 males.