Philadelphia County is in Philadelphia & Countryside Pennsylvania. Of the 67 counties in the Keystone State, 91,327-acre Philadelphia County ranks 66th by size. The total value of 1,000 acres of residential land and property recently listed for sale in Philadelphia County, Pennsylvania, was approximately $18 million. The average price of residential acreage for sale in Philadelphia County was $101,274. Browse all residential land and rural property for sale in Pennsylvania to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.