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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 American Community Survey.

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2021

Code Lists

Detailed codes for variables that contain a large number of coded responses, such as ancestry and occupation.

Instructions for Applying Statistical Testing

Basic instructions for obtaining the ACS standard errors needed to do manual statistical testing.

Subject Definitions

Definitions of population and housing variables to help you understand the results of the American Community Survey

Worked Examples for Approximating Margins of Error

Worked Examples on approximating standard errors for various types of ACS estimates.

Group Quarters Definitions

Definitions for classifying group living situations according to the type of housing and/or services provided

Statistical Testing Tool

Spreadsheet to quickly test whether ACS estimates are statistically different from one another.

Comparison Guidance

Learn more about comparing the 2021 ACS with 2020 Census, 2010 Census, and 5-year to 5-year estimates.

Accuracy of the Data

A basic explanation of the sample design, estimation methodology, and accuracy of the data.

Table Shells and Table List

Learn more about the layout of the tables and information about tables.

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