
Marion
- County:
- Marion County
- County Seat:
- Yes
- Area (mi²):
- 12.964
- State:
- Ohio
Marion is a city located in Marion County, Ohio. Marion has a 2025 population of 35,209. It is also the county seat of Marion County. Marion is currently declining at a rate of -0.46% annually and its population has decreased by -2.23% since the most recent census, which recorded a population of 36,013 in 2020.
The average household income in Marion is $58,224 with a poverty rate of 22.06%. The median age in Marion is 38 years: 37.8 years for males, and 38.2 years for females.