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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.
Population of Blair County. Last official estimated population of Blair County was 127,030 (year 2014)[1]. This was 0.04% of total US population and 1% of total Pennsylvania state population. Area of Blair County is 527.1 miÂ² (=1365.1 kmÂ²), in this year population density was 241.01 p/miÂ². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Blair County population in 2017 would be 126,986 .