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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.
According to the U.S. Census Bureau, the county has a total area of 347 square miles (900 km 2), of which 343 square miles (890 km 2) is land and 3.9 square miles (10 km 2) (1.1%) is water. Marion County includes the geographic center of the state of Kentucky, which is located 3 miles NNW of Lebanon, just off KY 429. Marion County is Kentucky's most Catholic county. The first Catholic settlers in Kentucky came to Holy Cross in the western part of the county.