Franklin County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 155,932. Its county seat is Chambersburg. Franklin County comprises the Chambersburg–Waynesboro, PA metropolitan statistical area, which is also included in the Washington–Baltimore combined statistical area…Franklin County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 155,932. Its county seat is Chambersburg. Franklin County comprises the Chambersburg–Waynesboro, PA metropolitan statistical area, which is also included in the Washington–Baltimore combined statistical area. The county is part of the South Central Pennsylvania region of the state.
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