Mansfield, city, seat of Richland County, north central Ohio; incorporated as a city 1857. Electrical machinery, primary and fabricated metals, home appliances, and rubber and plastic items are produced here. The city is served by an airport and is the site of the Ohio State University at Mansfield (1958), a junior college, the Mansfield Art Center, and a restored blockhouse, originally built during the War of 1812. The farm and home of the writer Louis Bromfield are nearby, as are several outdoor-recreation areas. The city is named for the United States surveyor general Jared Mansfield. Population 53,927 (1980); 50,627 (1990); 49,346 (2000).