I've always heard and used bathroom as an American. Restroom is also used for public facilities that don't actually have bathtubs.

It might break down like pop/soda. Are you from a pop or soda state?

Yeah, it probably depends on the region.

My state is split down the middle and I'm in the soda half.

Another lifelong American checking in with "bathroom". I've lived up and down the East coast, and "bathroom" would have been normal to hear anywhere, alongside "restroom". "Washroom" would be a very distant 3rd option.

'bathroom' is extremely common in the USA.