American Community Survey (ACS)

The American Community Survey (ACS) began full implementation of housing unit address in 2005. Since 2005, the ACS interviews samples of housing units in all counties in the United States (including the District of Columbia) and in all of the municipalities in Puerto Rico. Each year approximately 3 million housing unit addresses in the United States and Puerto Rico are selected.

In 2006 the ACS began interviewing residents in group quarter (GQ) facilities. Samples for GQ facilities and persons are selected independently within each state, including the District of Columbia and Puerto Rico. Each year approximately 2.5 percent of the expected number of residents in GQ facilities are included in the ACS.

For more information on the methods and procedures of the ACS, please see the ACS Design and Methodology paper [PDF 7.4MB].

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