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Marion, Pennsylvania. Marion is an unincorporated community and census-designated place (CDP) in Franklin County, Pennsylvania, United States. As of the 2010 census the population was 953. It lies along U.S. Route 11 6 miles (10 km) south of Chambersburg and 5 miles (8 km) north of Greencastle.
At the turn of the century in 1900, Perry County peaked in population at 31,783 or three times the population of the county in 2010 census. In 1909, Marion became the county seat.