Policy analysts, city planners, builders, developers, and  public- and private-sector organizations study the housing inventory to gauge and analyze the housing market.  In the United States in 2010, according to the Current  Population Survey/Housing Vacancy Survey (CPS/HVS),  of the 131.8 million housing units, 75.4 million were  owner occupied, 37.4 million were renter occupied, and  18.9 million were vacant.