The thing about New York and New Jersey is that even today, when authentic Mafiosi want to migrate to the states, they're more than likely going to migrate to those two states. There's still a good deal of a support system for the Mafia there compared to other cities and states. I'd say that Philadelphia is up there too, even cities like Chicago and Miami. Pretty much any city with a booming economy or a lot of buzzing activity provides opportunity for the Mafia to thrive. For some reason they don't seem to like the West Coast very much, but who knows Los Angeles may have a presence.