
Seneca township
- County:
- Monroe County
- County Seat:
- No
- Area (mi²):
- 22.46
- State:
- Ohio
Seneca township is located in Monroe County, Ohio. Seneca township has a 2025 population of 420. Seneca township is currently declining at a rate of -0.47% annually and its population has decreased by -3% since the most recent census, which recorded a population of 433 in 2020.
The average household income in Seneca township is $93,745 with a poverty rate of 2.73%. The median age in Seneca township is 11.8 years: 7.5 years for males, and 32.1 years for females.