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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.
217 residents are foreign born (22.9% Latin America). According to our research of Pennsylvania and other state lists there was 1 registered sex offender living in Marion, Pennsylvania as of March 28, 2017. The ratio of number of residents in Marion to the number of sex offenders is 953 to 1.