Youngstown is a city in the U.S. state of Ohio, and the county seat of Mahoning County. According to the 2010 United States Census, Youngstown had a city proper population of 66,982, making it the 9th largest city in Ohio. Youngstown is the most populous city in the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area, with a population of 565,773; this makes it the 105th-largest metropolitan area in the United States, and the 7th-largest in Ohio.
