Putnam County
Also known as Putnam County, Ohio, Putnam County, OH
county in Ohio, United States
Key facts
- Country
- United States
- State
- Ohio
- Founded
- January 3, 1834
- Named after
- Israel Putnam
- Seat
- Ottawa
- Largest village
- Ottawa
- Total
- 484 sq mi (1,250 km )
- Land
- 483 sq mi (1,250 km )
- Water
- 1.8 sq mi (4.7 km ) 0.4%
- Estimate 2025
- 34,380
- Density
- 71/sq mi (27/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
Article
Putnam County is a county located in the northwestern part of the U.S. state of Ohio. As of the 2020 United States census, the population was 34,451. Its county seat is Ottawa. The county was created in 1820 and later organized in 1834. Its name is in honor of Israel Putnam, a colonial officer in the French and Indian War, who served as a general in the American Revolutionary War. The Blanchard River, which passes through the county, was a key transportation route for early European-American settlers.
Geography