Oskaloosa township
- County:
- Clay County
- County Seat:
- No
- Area (mi²):
- 37.398
- State:
- Illinois
Oskaloosa township is located in Clay County, Illinois. Oskaloosa township has a 2026 population of 332. Oskaloosa township is currently declining at a rate of -0.9% annually and its population has decreased by -2.92% since the most recent census, which recorded a population of 342 in 2020.
The median household income in Oskaloosa township is $71,750 with a poverty rate of 32.29%. The median age in Oskaloosa township is 29.8 years: 30 years for males, and 23.8 years for females. For every 100 females there are 101.8 males.