Mansfield is a city in and the county seat of Richland County, Ohio, United States. Located midway between Columbus and Cleveland via Interstate 71, it is part of Northeast Ohio region in the western foothills of the Allegheny Plateau. The 2020 Census showed that the city had a total population of 47,534, making it the 21st-largest city in Ohio. It lies approximately 65 miles southwest of Cleveland, 45 miles southwest of Akron and 65 miles northeast of Columbus.