Methodology

The American Community Survey (ACS) is a national survey that uses continuous measurement methods. In this survey, a series of monthly samples produce annual estimates for the same small areas (census tracts and block groups) formerly surveyed via the decennial census long-form sample.

Through the 2014 Design and Methodology Report, and supplemental pages, the Census Bureau provides detailed information about the methods used to collect and produce ACS estimates, including information about the following:

the history and evolution of the ACS—including an archive of past questionnaires
the ACS sample, as well as current and historical sample sizes
ACS content and the process of testing new content
data collection
data processing—including weighting, estimation, and coding operations
data product preparation and release
how data quality is measured, as well as current and historical measures
how future changes are considered and researched

Methodology Resources

Design and Methodology Report

The updated ACS Design and Methodology Report includes information on changes to the ACS program through 2013, including the new internet response mode.

Sample Size and Data Quality

ACS samples about 3.54 million addresses each year. Discover how well that sample covers the population, and how we measure the reliability of ACS estimates.

Questionnaire Archive

Browse sample American Community Survey questionnaires in English and Spanish with instruction guides - 1996 through present.

Mandatory vs. Voluntary Methods

If the ACS was not mandatory research shows reduced response rates, increased sample, more follow-up, and additional cost of more than $90 million annually.

Content Test

The Census Bureau periodically conducts a Content Test to evaluate alternative content, questions and response categories for the American Community Survey.

Methodology

Methodology

Methodology Resources

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