Marion is a city in and the county seat of Marion County, Ohio, United States. The municipality is located in north-central Ohio, approximately 50 miles north of Columbus.The population was 36,837 at the 2010 census. According to the US Census 2008 estimate Ohio's Columbus–Marion–Chillicothe Combined Statistical Area has 2,002,604 people. Marion is the county's largest city and the center of the Marion Micropolitan Statistical Area. President Warren G. Harding, a former owner of the Marion Star, was a resident of Marion for much of his adult life.The city and its development were closely related to industrialist Edward Huber and his extensive business interests. The city is home to several historic properties, some listed on the National Register of Historic Places listings in Marion County, Ohio.The mayor of Marion is Scott Schertzer.