I can confirm what others have said: two windows open, line out the door. This place is slow, slow, slow. If you can avoid it, go to a different post office. Their large mail deposit doesn't seem to work too well and they are dreadfully understaffed. This leads to many customers getting angry and trying to cut the lines--which pisses off the rest of us. It's not a happy place.
Update: with two lines going out the door, one of the workers decided to take a break and close his window. Now there is one window open.
I'm also trying to figure out why the dedication plaque has George W Bush's name blacked out. I've never seen the president's name blacked out before on any dedication plaque.