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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 Equity Tools Data Tools and Apps Developers Experimental Data Products Interactive Maps Mapping Files Related Sites Software Tables Training and Workshops Visualizations
Survey Help View all Surveys & Programs
2020 Census 2030 Census American Community Survey (ACS) American Housing Survey (AHS) Annual Business Survey (ABS) Annual Survey of Manufactures (ASM) Census of Governments County Business Patterns (CBP) Current Population Survey (CPS) Economic Census International Programs Metro and Micro Areas Population Estimates Population Projections Small Area Income and Poverty Statistics of U.S. Businesses Survey of Business Owners 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

Technical Documentation

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Within American Community Survey (ACS)

Technical Documentation

The American Community Survey provides various documentation to assist users with our data releases.  Click on the links below to learn more about these resources. 

Code Lists, Definitions, and Accuracy
View the detailed codes and definitions for variables, statistical testing, and an explanation of sample design, methodology, and accuracy for the ACS.
User Notes
Learn more about issues impacting the American Community Survey, including design, collection, production, and data release.
Errata Note
Errata Notes
Learn more about errors and/or corrections related to the American Community Survey.
Data Suppression
October 01, 2016
Learn more about why certain American Community Survey estimates are not available due to data suppression.
Table
Table & Geography Changes
Explanation of changes in the universe of geographic entities, changes to GEOID codes, and comparability changes.
Table Shells and Table List
View the layout of American Community Survey tables without the estimates or margins of error filled in.

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Page Last Revised - July 15, 2022
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