Marion is a city located in Marion County Ohio. It is also the county seat of Marion County. With a 2020 population of 35,267, it is the 39th largest city in Ohio and the 1120th largest city in the United States . Marion is currently declining at a rate of -0.87% annually and its population has decreased by -4.26% since the most recent census, which recorded a population of 36,837 in 2010. Marion reached it's highest population of 38,646 in 1970. Spanning over 12 miles, Marion has a population density of 2,992 people per square mile.
The average household income in Marion is $49,443 with a poverty rate of 20.41%. The median rental costs in recent years comes to $729 per month, and the median house value is $74,600. The median age in Marion is 37.1 years, 36.5 years for males, and 38.1 years for females.