Gonna respond to this one because I see this repeated a lot, but that is not in fact reality.

Philly: 1.576 million

Bucks: 646k

Montco: 860k

Delco: 576k

Chester: 534k

Allegheny(Pittsburgh): 1.250 million

Total: 5.442 million / 13 million total state population = less than half

(even if you threw in the Lehigh Valley with 700k people it'd still be less than half)

I don't even care that people assume PA is like SEPA btw, I like Philly, it is still the most populated region of the state and has by far our largest city as well as largest media presence and economy. The rest of the state isn't just unpopulated tho, and that's a claim I see repeated quite often. The other subregions aren't especially similar to one another either, even the ARC parts, which is one place I will disagree with the OP.