High Quality Content by WIKIPEDIA articles! The Youngstown Metropolitan Area is a metropolitan area centered on the American city of Youngstown, Ohio. According to the US Census Bureau, the metropolitan area includes Mahoning and Trumbull counties in Ohio and Mercer county in Pennsylvania. The CSA includes the county of Columbiana in Ohio. This area also has a strong commuter interchange with Cleveland and Pittsburgh and their metropolitan areas. Parts of Steel Valley make up the metropolitan area.