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 2026 population of 266. Ohio Grove township is currently declining at a rate of -1.12% annually and its population has decreased by -2.21% since the most recent census, which recorded a population of 272 in 2020.
The median household income in Ohio Grove township is $200,000 with a poverty rate of 0%. The median age in Ohio Grove township is 37.9 years: 37.5 years for males, and 39.4 years for females. For every 100 females there are 86.2 males.