The Youngstown metropolitan area, typically known as the Steel Valley as well as Mahoning Valley, is a metropolitan area in Northeast Ohio in the United States, with the city of Youngstown, Ohio at its center. According to the US Census Bureau, the metropolitan statistical area (MSA) includes Mahoning and Trumbull counties in Ohio and Mercer county in Pennsylvania. As of the 2010 census, the MSA had a population of 565,773.