Vacant mobile homes on dealers' sales lots, at the factory, or in storage yards are excluded from the housing inventory. Vacant mobile homes are included provided they are intended for occupancy on the site where they stand. Boats, recreational vehicles (RVs), vans, tents, railroad cars, and the like are included only if they are occupied as someone's current place of residence. Both occupied and vacant housing units are included in the housing unit inventory. If that information cannot be obtained, the criteria are applied to the previous occupants. For vacant units, the criteria of separateness and direct access are applied to the intended occupants whenever possible. Separate living quarters are those in which the occupants live separately from any other individuals in the building and which have direct access from outside the building or through a common hall. For subject definitions from previous years, visit A housing unit may be a house, an apartment, a mobile home, a group of rooms or a single room that is occupied (or, if vacant, intended for occupancy) as separate living quarters.Beginning in 2009, the weighting methodology has changed to include the use of controls for total population for incorporated places and minor civil divisions. For more information on the 2006 weighting methodology changes, see User Notes on the ACS website ( There were no significant changes to the 2007 or 2008 weighting methodology. Weighting Methodology: The weighting methodology in the 2006 ACS was modified in order to ensure consistent estimates of occupied housing units, households, and householders.Historical Census Comparability: For additional information about the data in previous decennial censuses, see Appendix B and subject definitions for American Community Survey years prior to 2005.
Beginning in 2006, the population in group quarters is included in the data tabulations. References about comparability to the previous ACS years refer only to the ACS in the United States. The text specifically notes any differences. Scope: These definitions apply to the data collected in both the United States and Puerto Rico.Contact List: To obtain additional information on these and other American Community Survey (ACS) subjects, see the list of Census 2000/2010 Contacts on the Internet at.
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