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.
Learn more about issues impacting the American Community Survey, including design, collection, production, and data release.
Learn more about why certain American Community Survey estimates are not available due to data suppression.
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.