Philadelphia County, Pennsylvania

county in Pennsylvania, United States

Philadelphia County is the most populous county in the U.S. state and Commonwealth of Pennsylvania. As of 2017, Philadelphia County had a population of 1,580,863 residents.[1] The county is the second smallest county in Pennsylvania by land area, but the largest in population.

Philadelphia County is one of the three original counties, along with Chester and Bucks counties, created by William Penn during November 1682.


  1. "State & County QuickFacts". United States Census Bureau. Retrieved June 18, 2018. CS1 maint: discouraged parameter (link)