-Billie lives in the back of Ollivander's Wand Shop on High Street.
-Clem lives at the Home for Inconvenient Children.
-Jon lives in the Slums in Hogsmeade. Likely on the Eastern side, somewhere in the maze of homes off of Scratching Turn.
-I don't know which street the Lupins would live on in Wellingtonshire? Leo likely thinks he owns it all, either way.
-Zachariah lives above his shop, Whizzhard Books. If he ever settled down, he'd likely move to a real house.