Census data (limit search by "Topics")
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Statistical Data (statistics, studies and reports)
Includes agricultural, business, education, government, and health data.
Pew Research Center (reports, data and polling)
"The Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping the world. [The Center] conducts public opinion polling, demographic research, content analysis and other data-driven social science research."