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View All Topics and Subtopics Index A to Z

Age and Sex Business and Economy Education Emergency Management / Disasters Employment Families and Living Arrangements Geography Health Hispanic Origin Housing Income and Poverty International Trade Migration/Geographic Mobility Population Population Estimates Public Sector Race Redistricting Research Voting and Registration

Explore data on data.census.gov View all data resources

Census Academy Combining Data Data Tools and Apps Datasets Developers Experimental Data Products Interactive Maps Mapping Files Profiles Related Sites Software Tables Training and Workshops Visualizations

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2020 Census 2026 Census Test 2030 Census American Community Survey (ACS) American Housing Survey (AHS) Annual Business Survey (ABS) Annual Integrated Economic Survey (AIES) County Business Patterns (CBP) Current Population Survey (CPS) Economic Census Household Pulse Survey International Programs Metro and Micro Areas Population Estimates Population Projections Small Area Income and Poverty Statistics of U.S. Businesses Survey of Income and Program Participation (SIPP)

View all library resources Glossary

America Counts: Stories Audio Blogs By the Numbers Facts for Features Fact Sheets Infographics and Visualizations Photos Publications Spotlights Stats for Stories Training (Census Academy) Videos Working Papers

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Leading up to the annual release of new datasets, the Census Bureau publishes a schedule, notes about new estimates or new guidance, and technical information about geography and product changes. Users can also browse the notes from previous years using the tabs below.

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2011

Details About the 2011 Release

2011 New & Notable

Learn more about items of interest related to the 2011 ACS release.
2011 Release Schedule

Review the dates and components of the 2011 ACS release.
Table & Geography Changes

Explanation of changes in the universe of geographic entities, changes to GEOID codes, and comparability changes.

Geographic Notes

The 2007-2011 ACS 5-year data release marks the first time estimates for ZIP Code Tabulation Areas (ZCTAs) are available. Learn how ZCTAs are different from ZIP Codes.
ACS Estimates for Urban Areas and PUMAs continue to use Census 2000 definitions. These geographies will use 2010 Census definitions in the 2012 ACS data release planned for 2013.