Crown molding can be put in every room of the house if you want to put the crown molding there.
But Crown Molding mostly goes in rooms such as dining rooms, living rooms, family rooms and kitchens.
Crown molding isn't usually installed in laundry rooms, bedrooms or bathrooms but you certainly can install the crown molding in those rooms if you want too.
I've seen some houses with crown molding in all rooms and other houses without the crown molding in the bathroom, bedrooms, laundry rooms but in the other rooms.