I would definitely say Pennsylvania is the pinball mecca of the US. I don't know why but tons of pinheads, bars, distributors, etc. make Pennsylvania the dominant pinball location. If you look at Craigslist and the number of pinball ads it is always a top contender. The other thing I have noticed about people in PA is everyone seems to trade pinball machines like baseball cards, there seems to be no hoarders in PA. I would say Chicago is second followed by NY and other NE regions.