
Ottawa
- County:
- Putnam County
- County Seat:
- Yes
- Area (mi²):
- 4.547
- State:
- Ohio
Ottawa is a village located in Putnam County, Ohio. Ottawa has a 2025 population of 4,393. It is also the county seat of Putnam County. Ottawa is currently declining at a rate of -0.25% annually and its population has decreased by -1.28% since the most recent census, which recorded a population of 4,450 in 2020.
The average household income in Ottawa is $82,950 with a poverty rate of 10.03%. The median age in Ottawa is 41.8 years: 36.9 years for males, and 46.1 years for females.