High Quality Content by WIKIPEDIA articles! Youngstown is a city in the U.S. state of Ohio and the county seat of Mahoning County; it also extends into Trumbull County. The municipality is situated on the Mahoning River, approximately 65 miles (105 km) southeast of Cleveland and 61 miles (100 km) northwest of Pittsburgh, Pennsylvania. Youngstown has its own metropolitan area, but is often included in commercial and cultural depictions of the Pittsburgh Tri-State area and Greater Cleveland. Youngstown lies 10 miles (16 km) west of the Pennsylvania state line, midway between New York City and Chicago via Interstate 80.