Washington township
- County:
- Miami County
- County Seat:
- No
- Area (mi²):
- 21.039
- State:
- Ohio
Washington township is located in Miami County, Ohio. Washington township has a 2026 population of 1,523. Washington township is currently growing at a rate of 0.99% annually and its population has increased by 2.91% since the most recent census, which recorded a population of 1,480 in 2020.
The median household income in Washington township is $80,246 with a poverty rate of 2.96%. The median age in Washington township is 52.5 years: 56.2 years for males, and 52.3 years for females. For every 100 females there are 91.8 males.