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The American Community Survey (ACS) is a large continuous survey that replaces the Decennial Census long form sample. A sample for the ACS is selected in each of the 3,141 counties and county equivalents in the United States, including the District of Columbia, and each of the 78 municipios in Puerto Rico. Samples of housing unit (HU) addresses and group quarters (GQ) facilities are selected separately. The first full-implementation sample of HU addresses was selected for use in 2005. Each year the ACS samples about three million HU addresses in the United States and about 36,000 HU addresses in Puerto Rico. The first full-implementation sample of GQ facilities was selected for use in 2006 and approximately 2.5 percent of the people in GQ facilities will be included in the ACS annually.
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