In 1990, the total number of housing units was 102,263,678. By 2000, this had grown to 115,904,641 units, an increase of about 13%. Single unit detached structures increased from 60,383,409 in 1990 to 69,865,957 in 2000, a jump of 15.7%.
The number of structures with two or more units increased over the decade in every category except those with 10 to 19 units, which saw a 5% decline. Buildings with 20 or more units rose