Marietta township
- County:
- Washington County
- County Seat:
- No
- Area (mi²):
- 14.822
- State:
- Ohio
Marietta township is located in Washington County, Ohio. Marietta township has a 2026 population of 4,185. Marietta township is currently declining at a rate of -0.26% annually and its population has decreased by -2.15% since the most recent census, which recorded a population of 4,277 in 2020.
The median household income in Marietta township is $55,765 with a poverty rate of 15.01%. The median age in Marietta township is 49.7 years: 47.7 years for males, and 52.6 years for females. For every 100 females there are 109.2 males.