Washington township
- County:
- Hardin County
- County Seat:
- No
- Area (mi²):
- 35.864
- State:
- Ohio
Washington township is located in Hardin County, Ohio. Washington township has a 2026 population of 707. Washington township is currently declining at a rate of -0.14% annually and its population has decreased by -2.21% since the most recent census, which recorded a population of 723 in 2020.
The median age in Washington township is 43.1 years: 42.1 years for males, and 43.9 years for females. For every 100 females there are 120.9 males.