Phoenix, Arizona here. Well, I live over in Scottsdale, which I guess is a suburb of Phoenix (maybe?). Anywho, here are the snakes I've seen here:

Garter snakes (most likely it was a Common Garter.. I think??)
Rattlesnakes (the holy Western Diamondback)
Black Headed snake (my friend found a tiny little baby one at school and he gave it to me LOL.. he said, "Here Tiffany, I got you a new snake.")