Data: US Census Bureau (Public Law 94-171 Summary Files), Penn State Harrisburg, Pennsylvania State Data Center, Center for Rural Pennsylvania (According to the Center for Rural Pennsylvania's definition, a rural county has a population density below the statewide average of 284 people per square mile. Urban counties have a density at or above the statewide average. Density calculated from 2010 Census data).
Jonathan Cervas | Carnegie Mellon University
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