Love the black squirrels! They are uncommon in the east but some were brought to MA from the midwest by some scientists years back so some will be found there. There is also a group of them in the Greenwich, CT area which I have seen. Mostly they abide in OH and MI which is where I have seen the most of them. Very pretty for "tree rats".
I have not seen any around where I live. Earlier this year, when I went fishing at Grand Lake St. Marys, I saw one. I hope it sticks around for you, Chris!