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 AccuracyView the detailed codes and definitions for variables, statistical testing, and an explanation of sample design, methodology, and accuracy for the ACS.
-
Data Release RulesUnderstand American Community Survey data release rules for tabulated data products and what to do when the ACS data you need are missing.
-
Errata NotesLearn more about errors and/or corrections related to the American Community Survey.
-
Table & Geography ChangesExplanation of changes in the universe of geographic entities, changes to GEOID codes, and comparability changes.
-
Table Shells and Table ListView the layout of American Community Survey tables without the estimates or margins of error filled in.
-
User NotesLearn more about issues impacting the American Community Survey, including design, collection, production, and data release.
Page Last Revised - May 1, 2025