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              Congressional____
          ~ Research Service






The American Community Survey



January   16, 2024


Overview

The U.S. Census Bureau's American Community Survey (ACS) is intended to measure the changing
social, economic, demographic, and housing characteristics of the U.S. population. The ACS is sent to a
sample of addresses across the 50 states and the District of Columbia on a rolling basis, with
approximately 3.5 million addresses sampled annually. The Census Bureau also operates the Puerto Rico
Community  Survey, which covers the same topics as the ACS, with relevant adjustments.
ACS  data are used to produce one-year and five-year population estimates. Five-year estimates increase
the reliability of statistics for less-populated areas and small population subgroups. One-year estimates are
intended to provide more frequent data but are not available for smaller populations because the sample
sizes are too small to produce reliable statistics. Similar to the decennial census, respondents are required
by law to complete the ACS.
Prior to the 2005 inauguration of the ACS, a subset of households responding to the decennial census
would be provided a long-form survey, which asked additional demographic characteristics questions
outside of the standard short-form survey. The Census Bureau found that a decennial collection of
detailed population characteristics did not reflect the rapid demographic changes in the United States. As
a result, the agency removed the long-form survey to implement a more frequent ACS intended to reduce
operational risks, improve accuracy, and provide more relevant data.
ACS  data are used by multiple stakeholders-including businesses, local governments, the federal
government, and private users-for economic development, government decisionmaking, and research
purposes.


Survey Content Development

Content development for the ACS relies on coordination between the U.S. Census Bureau and the Office
of Management and Budget (OMB) through an interagency committee that comprises over 30 federal
agencies. Before a new question can be added to the ACS, the Census Bureau conducts content testing.
Content tests for the ACS begin with a proposed new or changed survey question, and the overall process
lasts five years (see Table 1).

                                                                Congressional Research Service
                                                                https://crsreports.congress.gov
                                                                                     IN12303

CRS INSIGHT
Prepared for Members and
Committees of Congress

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