
St. Clair township
- County:
- Columbiana County
- County Seat:
- No
- Area (mi²):
- 29.458
- State:
- Ohio
St. Clair township is located in Columbiana County, Ohio. St. Clair township has a 2025 population of 7,560. St. Clair township is currently declining at a rate of -0.51% annually and its population has decreased by -2.82% since the most recent census, which recorded a population of 7,779 in 2020.
The average household income in St. Clair township is $79,247 with a poverty rate of 7.18%. The median age in St. Clair township is 51.3 years: 44.8 years for males, and 56.3 years for females.