American Community Survey (ACS)

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 Notes

Learn more about errors and/or corrections related to the American Community Survey.

Data Suppression

Learn more about why certain American Community Survey estimates are not available due to data suppression.

Table & Geography Changes

Learn more about changes to tables and geography for each American Community Survey data release.

Table Shells

View the layout of American Community Survey tables without the estimates or margins of error filled in.

Summary File Documentation

View technical documentation and user tools available for the American Community Survey Summary File.

PUMS Documentation

Learn more about how to work with the American Community Survey Public Use Microdata Sample (PUMS) files.

Variance Replicate Tables Documentation

View documentation available for the American Community Survey variance replicate tables.

Race/Ethnicity and American Indian & Alaska Native Documentation

View documentation for the American Community Survey Selected Population Tables and American Indian and Alaska Native Tables.