After looking at the number of vacant homes in the United States, we turn to a measure of all houses in the country. The market size number presented below includes all single-family attached and detached units as well as apartments and condominiums, it is the total of all residential housing units.

This market size is broken out by type of housing unit in this way: Single family detached homes, 63.4%; single family attached (townhouses and the like), 5.5%; apartments and condominiums in 2 to 4 unit buildings, 7.8%; units in 5 to 9 unit buildings, 4.9%; units in buildings with 10 to 19 units, 7.4%; apartments and/or condominiums in buildings with 20 or more units, 7.4%, and manufactured/mobile homes, 6.8%.

Geographic reference: United States
Year: 2009
Market size: 130,112,000 housing units
Source: “Housing Units—Characteristics by Tenure and Region: 2009,”
Statistical Abstract of the United States: 2011, Table 983, U.S. Census Bureau, page 616.
Original source: U.S. Department of Commerce, Bureau of the Census.