
Hillsdale
- County:
- Rock Island County
- County Seat:
- No
- Area (mi²):
- 0.648
- State:
- Illinois
Hillsdale is a village located in Rock Island County, Illinois. Hillsdale has a 2025 population of 403. Hillsdale is currently declining at a rate of -0.49% annually and its population has decreased by -2.42% since the most recent census, which recorded a population of 413 in 2020.
The average household income in Hillsdale is $100,277 with a poverty rate of 16.97%. The median age in Hillsdale is 38.5 years: 38.7 years for males, and 37.5 years for females.