Mansfield is a city located in Richland County, Ohio, United States. It is the county seat of Richland County and is part of the Mansfield Metropolitan Statistical Area. The city has a population of approximately 46,825 residents as of the 2020 census. Mansfield is known for its historic downtown area, with numerous 19th-century buildings, as well as its cultural attractions such as the Renaissance Theatre and the Mansfield Art Center. The city is also home to the Ohio State Reformatory, a former prison that has been converted into a museum and event venue. Additionally, Mansfield is situated in a region with an abundance of outdoor recreational opportunities, including nearby state parks and nature preserves.