I can't say for anywhere else, but in Southeast Missouri, there are 5 Nitrogen fixing trees.
Well, we only studied 5 in my dendrology class. I'm sure there are more.
Mimosa (Albizia julibrissan)
Honey Locust (Gleditsia triacanthos)
Black Locust (Robinia pseudo-acacia)
Red Bud (Cercis canadensis)
Kentucky coffee tree (Gymnocladus diocus)