
Viola township
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 35.364
- State:
- Illinois
Viola township is located in Mercer County, Illinois. Viola township has a 2025 population of 301. Viola township is currently declining at a rate of -0.33% annually and its population has decreased by -1.31% since the most recent census, which recorded a population of 305 in 2020.
The average household income in Viola township is $113,805 with a poverty rate of 13.68%. The median age in Viola township is 29 years: 29.3 years for males, and 26.9 years for females.