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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.
For the community in Shelby County, see Marion, Shelby County, Indiana. Marion is a city in Grant County, Indiana, United States. The population was 29,948 as of the 2010 census. The city is the county seat of Grant County. It is named for Francis Marion, a Brigadier General from South Carolina in the American Revolutionary War.