BING BING - you hit it on thee nose, Dennis; rules are such as this to try to keep from individuals being "counted twice", in two places; which on rare occasions you WILL find on older Census' - especially when "Daddy was a Carpet-bagger", (traveling Salesman). Sometimes in older Census you'll find "Dad" listed as a *boarder* at a residence in another Town, even State, it doesn't always mean divorce &/or separation; just that life keeps on moving, even when you're trying to *count* everybody..