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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.
Marion, IL. Sponsored Topics. The city of Marion is the county seat of Williamson County, Illinois. The 2010 census counted 17,193 residents, making Marion the 25th most populated city outside of the Chicago Metropolitan Area, in Illinois, and the second most populous city in Southern Illinois, outside of the Metro-East, behind Carbondale.