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2016-2020 American Community Survey 5-year estimates are now available, including the Public Use Microdata Sample (PUMS) Files and Variance Replicate Estimate (VRE) Tables.

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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Code Lists, Definitions, and Accuracy

Code Lists

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

Subject Definitions

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

Group Quarters Definitions

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

Comparison Guidance

Learn more about comparing the 2018 ACS with Census 2000, 2010 Census, and 5-year to 5-year estimates.

Table Shells and Table List

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

Instructions for Applying Statistical Testing

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

Worked Examples for Approximating Margins of Error

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

Statistical Testing Tool

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

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