IPUMS USA
Harmonized U.S. census microdata for research across centuries.
IPUMS USA provides cleaned and consistently documented U.S. census and American Community Survey microdata for researchers. It covers decennial census data from 1790–2010 and ACS/PRCS data from 2000 onward, with tools for selecting variables, building extracts, downloading data, and analyzing data online.
Why it stands out
- Makes census and ACS microdata comparable across time instead of leaving each census as a separate source.
- Exceptionally long historical coverage, reaching back to early U.S. census years.
- Pairs raw microdata access with detailed variable, sample, questionnaire, and revision documentation.
- Includes specialized add-ons such as linked historical census data, full-count files, mortality censuses, and GIS-oriented resources.
- Data and services are provided free of charge.
Good to know
- The core collection is limited to U.S. census and ACS/PRCS microdata, not all U.S. government statistics.
- The page lists decennial census coverage through 2010, so users needing 2020 decennial microdata should verify availability separately.
- Some older archived documents may not meet current digital accessibility standards and may require a request for an accessible version.
Photos
Social scientists, policy researchers, and public-health analysts can build comparable U.S. population datasets across long time periods. Study changes in income, education, household structure, migration, or demographics across census years. Create a custom extract with only the samples and variables needed for a statistical project. Use linked, full-count, mortality, enslaved-persons, or geography/GIS supplements for specialized historical research.
Custom dataset builder, online analysis tool, sample and variable documentation, census questionnaires and published volumes, supplemental datasets, geography and GIS resources, linked census data, user guides, FAQs, tutorials, and a support forum.
Technical Notes
- Users can create custom data extracts and download selected census/ACS microdata for analysis.
- The site also offers an online analysis tool for working with IPUMS USA data without first downloading a full extract.
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Similar sites elsewhere
- U.S. Census Bureau Data — data.census.gov
- Census ACS Public Use Microdata Sample — census.gov/programs-surveys/acs/microdata.html
- ICPSR — icpsr.umich.edu
- Social Explorer — socialexplorer.com
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