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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, SD Population and Races. As of 2010-2014, the total population of Marion is 730, which is 18.16% less than it was in 2000. The population growth rate is much lower than the state average rate of 10.58% and is much lower than the national average rate of 11.61%.