About 60 or 70 miles southeast of me there's a town named Olney, it is the home of the White Squirrel.
https://en.wikipedia.org/wiki/...
Pictures of the whites -
https://images.search.yahoo.co...
Saw some there years ago. Haven't really been back since.
I think there's an enclave of black squirrels in Van der Veer Botanical Gardens in Davenport, Iowa. I took a picture some year's past, but it didn't turn out, subsequently discarded. I may inquire if they've 'a black squirrel population on site. If I do, I'll let you know.
We've squirrels in my neighborhood here in central Illinois, they usually have a reddish cast (but sometimes more brown or grey).. We hear them on the roof frequently. They like to steal sunflower heads in the fall. Surprisingly, they've never raided the bulbs in the garden (and there's a lot of bulbs, a whole lot...).