I’m guessing Allegheny County. The one in Lancaster County has no police force, as far as I know. Plus you’re more likely to run into a loaded rifle in Allegheny. A lot of Philly transplants live in northern Lancaster County.
Yes, this is at the far southern tip of Allegheny County.
Close to some former steel mill towns where civilization has basically collapsed (Clairton, Monessen, Donora....)