Washington County Flag

Washington County

State:
Ohio
County Seat:
Marietta

Washington County's estimated 2025 population is 57,995 with a growth rate of -0.5% in the past year according to the most recent United States census data. Washington County is the 45th largest county in Ohio. The 2010 population was 61,714 and has seen a growth of -6.03% since that time.

57,995
Total Population
92
Population Density (mi²)
45
Population Rank (State)
-291 -0.5%
Annual Population Growth

Washington County Population

Demographics

Economics and Income Statistics