The Ohio State University at Marion, often referred to as OSU Marion, is a regional campus of The Ohio State University located in Marion, Ohio, USA. The campus was founded in 1957. Its 180-acre campus is located 45 miles north of Columbus. There are six buildings on the campus with a seventh currently under construction. OSU Marion has baccalaureate program accreditation with NCATE. Its average class size is 22. An average age of students is 23.5.