The Integrated Public Use Microdata Series (IPUMS) contains U.S. Census and American Community Survey microdata from 1850 to the present. Also has microdata from the Current Population Survey (labor force), nearly 100 international censuses, Time Use surveys, and more.
The Inter-University Consortium for Political and Social Research. Gold standard of curation, cleaning, and description of datasets. Includes government data as well as researcher-created data, including election data, opinion polls, more.
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