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United States Census
STATS America: Your Portal of U.S. Data
"STATS America is a service of the Indiana Business Research Center at Indiana University's Kelley School of Business. We obtain thousands of data items from hundreds of data sets from dozens of federal and state sources, along with some commercial or private source data. While STATS America adds value to these data through easy access and functionality, we acknowledge the direct agency source of the data on every table, profile or map."
Inter-University Consortium for Political and Social Research (ICPSR) This link opens in a new windowThis web page provides search and browsing access to abstracts and data sets in the world's largest archive of computerized social science data. Search or browse title of study, principal investigator, words in abstract, or study number. Browse major research categories
Social Explorer This link opens in a new windowIncludes data beginning with the 1940 census
IPUMS-USA This link opens in a new windowThe Integrated Public Use Microdata Series (IPUMS) consists of thirty-eight high-precision samples of the American population drawn from fifteen federal censuses and from the American Community Surveys of 2000-2004. The IPUMS assigns uniform codes across all the samples and brings relevant documentation into a coherent form to facilitate analysis of social and economic change. Registration required: users are automatically registered when they agree to all conditions for use.