Canadian, grew up small town, live in the city for the last 25 or so years.
In public, washroom or restroom. At home, the 2 piece is the washroom, the 3 piece is the bathroom. When I'm out at friends, it's the washroom, the can, the loo, the facilities.
A friend was working a receptionist type position. If she left her desk, someone had to cover for her. So she'd say to one of her coworkers, 'Can you watch the desk for a minute? I've got to go check my hair.' I liked that one so I started using it.