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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.
The population density in Marion is 3994% higher than Iowa. The median age in Marion is 2% lower than Iowa. In Marion 93.61% of the population is Caucasian. In Marion 1.91% of the population is African American. In Marion 2.02% of the population is Asian.