I live in the suburbs outside of Philadelphia and it is known as the Mainline. (Places like Villanova, Bryn Mawr, Ardmore, Haverford are all in this region).
As for Philly, I've heard it called Filth-adelphia.
Also, some parts of PA are pretty rural, so sometimes the state can be referenced as Pennsyl-tucky, but I haven't heard that too often.
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