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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 counties with a similar name, see Marion County (disambiguation). Marion County is a county in the U.S. state of West Virginia. As of the 2010 census, the population was 56,418. Its county seat is Fairmont. The county was named in honor of General Francis Marion (ca. 1732â1795), known to history as The Swamp Fox.