what county is mercer pa in
Mercer County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 116,638. Its county seat is Mercer, and its largest city is Hermitage. The county was created in 1800 and later organized in 1803. Mercer County is included in the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area.