
Fostoria
- County:
- Seneca County
- County Seat:
- No
- Area (mi²):
- 7.574
- State:
- Ohio
Fostoria is a city located in Seneca County, Ohio. Fostoria has a 2025 population of 13,036. Fostoria is currently declining at a rate of -0.01% annually and its population has decreased by -0.05% since the most recent census, which recorded a population of 13,043 in 2020.
The average household income in Fostoria is $62,151 with a poverty rate of 19.55%. The median age in Fostoria is 38.8 years: 38.4 years for males, and 39 years for females.