IPUMS USA: Version 9.0

Steven Ruggles, Sarah Flood, Ronald Goeken, Josiah Grover, Erin Meyer, Jose Pacas, and Matthew Sobek. Integrated Public Use Microdata Series: Version 9.0 [dataset]. Minneapolis: University of Minnesota, 2019. http://doi.org/10.18128/D010.V9.0


IPUMS USA contains harmonized census and American Community Survey (ACS) data from 1790 to the present. For the period 1850 to 1940, IPUMS includes 100% of individuals in the decennial censuses. For the period 1950 to 2010, we have public use samples of decennial censuses. For the period since 2000, IPUMS provides annual ACS public use samples. The available information in the censuses and ACS varies by year, but generally includes basic housing data (type of housing, household appliances, and housing characteristics), demographic data (age, race, sex, marital status, and relationship to the head of household), economic data (occupation, industry, income, work status), and other individual characteristics (migration, disability, veteran status). For the period 1790 to 1840, IPUMS includes household level records for 100% of households. IPUMS USA is available through an online data access system free of charge to registered users at usa.ipums.org.


Data are available by request to registered IPUMS-USA users. Please contact ipums@umn.edu. Archived versions of the data have been stored in fixed format files with accompanying documentation and set-up files. The full data set has been broken into appropriate subsets reflecting the content and usage of the data.

Revision history

IPUMS-USA data are continually revised. We archive annual snapshots and document changes between snapshots. The changes made to Version 9.0 before we archived Version 10.0 occurred between 3-26-2019 and 5-13-2020 on the current revisions page.