Plenty of squirrels in east central Indiana waiting to get in my belly, even a black one in my back yard regularly (I know....there goes the neighborhood). The chipmunk population has all but disappeared around here but I don't know anything about that.
The only time I've seen black squirrels was up in Toronto (Mississauga actually), Canada. I was like, WTH is THAT?? They're as common as fox squirrels are down here.