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    Mercer County,


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      Mercer County is a county located in the U.S. state of Pennsylvania. As of the 2020 census, the population was 110,652. 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.
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