In my 15 years of doing Nuisance Wildlife Control work in Oklahoma and Texas, I have only seen 2 Albino Squirrels
How Rare Are Albino Squirrels?
The albino gene is recessive, this means that both parents would need the gene to have an albino anything. This results in a 1/4 (25%) chance of having an albino squirrel / human / whatever. As such, if you look up the total population of a given animal and multiply it by 25% and subtract that number, you get the total amount of albinos.