Washington County Flag

Washington County

State:
Ohio
County Seat:
Marietta

Washington County's estimated 2026 population is 57,970 with a growth rate of -0.31% 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 -6.07% since that time.

57,970
Total Population
92
Population Density (mi²)
45
Population Rank (State)
-181 -0.31%
Annual Population Growth

Washington County Population

Demographics

Economics and Income Statistics