
Ohio Grove township
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 36.804
- State:
- Illinois
Ohio Grove township is located in Mercer County, Illinois. Ohio Grove township has a 2025 population of 270. Ohio Grove township is currently declining at a rate of 0% annually and its population has decreased by -0.74% since the most recent census, which recorded a population of 272 in 2020.
The average household income in Ohio Grove township is $169,459 with a poverty rate of 0%. The median age in Ohio Grove township is 39.1 years: 37.3 years for males, and 39.9 years for females.