I have a fundamental question. Does it really matter where you are located unless you're an international candidate? Even then - does it matter?
Never once in my life have I read anything that says that they call in a certain order. I suppose it makes sense to go east to west, but it's not even 2:45 in EST now anyway. On top of that, it's not like anyone is going to care if they get a phone call at 8:00 at night letting them know that they got into a top tier grad school.
Maybe I'm wrong, but to me it seems like it should all be random?