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The county cornerstone. William Penn established Pennsylvania’s three original counties – Philadelphia, Bucks, and Chester – in 1682. Until the 1800s, the major function of these counties was to provide a headquarters for the court.How many counties are in the state of PA?
There are 67 counties in Pennsylvania State,details are as follows: Adams County. Allegheny County. Armstrong County. Berks County.What are the counties in Southeast Pennsylvania?
Southeastern Pennsylvania. The Greater Philadelphia Region (or District or Market Area) also extends into South Jersey and Northern Delaware (also called the " Tri-State area "). Delaware Valley includes not just Pennsylvania, but counties in Southern NJ and Northern DE (i.e., the Tri-State area), and Cecil County, MD if you go for it's broadest use.