Osco township
- County:
- Henry County
- County Seat:
- No
- Area (mi²):
- 36.484
- State:
- Illinois
Osco township is located in Henry County, Illinois. Osco township has a 2026 population of 415. Osco township is currently declining at a rate of -0.48% annually and its population has decreased by -2.58% since the most recent census, which recorded a population of 426 in 2020.
The median household income in Osco township is $110,119 with a poverty rate of 2.59%. The median age in Osco township is 61.5 years: 56.7 years for males, and 61.8 years for females. For every 100 females there are 139.8 males.