Empty Houses, Buffalo, New York Times
That is what the census says. Andrew Leonard in Salon notes that it is a bit misleading, that "4.7 million are for "seasonal use" only, the Census tells us -- unoccupied vacation homes, in other words. 4.1 million are for rent, 2.3 million are for sale, and the remaining 7.5 million "were vacant for a variety of other reasons."
The census also lists the total number of homeless in America as 759,101, so there are 24 empty houses for every homeless person in America. What a shocking misallocation of resources, materials and energy. ::How the World Works