In this year’s edition of the always useful Statistical Abstract of the United States, a publication we turn to often in our work, we found the number of vacant housing units (single-family attached and detached units as well as apartments, all capable of occupancy year-round).

Geographic reference: United States
Year: 2009
Market size: 13,688,000 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.