All of them! It's true! Often restroom if I'm at a restoraun, washroom at school, and bathroom at hom.
Same here! :'D Actually, I tend to alternate the most between bathroom and washroom/toilet. I mean.... whenever someone says the word bathroom, I get visions in my mind of a place where you can wash up and all AND take a shower/bath. Because of that, it feels odd to call the toilet/washroom a bathroom in a place like.... a restaurant, airport, random hotel lobby place, or something. :'D Nu showers installed as far as I can see! (Or bathtubs! X'D)
Yep, I say bathroom too. Though, I have thought of what Yakra said as well, before she said it -- how can it be a BATH room if it doesn't have a bath?! It should be a "toilet room" or something. Granted you DO wash your hands after, so "washroom" makes a little bit of sense, though it's not exclusively made for washing. They have shower rooms, so that makes sense!
Bathroom's pretty much a cover-all statement for me. Unless I explicitly state my intention... which is pretty much only the case when I'm trying to be vulgar... or if I'm gonna take a shower. Which isn't that vulgar.