Marion County Flag

Marion County

State:
Ohio
County Seat:
Marion

Marion County's estimated 2025 population is 65,335 with a growth rate of 0.37% in the past year according to the most recent United States census data. Marion County is the 38th largest county in Ohio. The 2010 population was 66,459 and has seen a growth of -1.69% since that time.

65,335
Total Population
162
Population Density (mi²)
38
Population Rank (State)
242 0.37%
Annual Population Growth

Marion County Population

Demographics

Economics and Income Statistics