MIT repository for numeric datasets. Houses data from ICPSR, data produced by MIT faculty, and others. Enables online subsetting and data analysis.

Compendium of U.S. historical statistics from over 1000 sources, plus scholarly essays. Tables can be viewed in PDF/HTML and downloaded in Excel or CSV.

World's largest archive of digital social science data. Search and browse for data and related publications. Provides training in data analysis.

Database of questions from public opinion polls around the world. Search question text and get poll results. 1986 to present

Archive of data from public opinion surveys. Download data from their catalog or search IPoll, their question-level database of survey results.

Visually displays the demographic change that has occurred in the US since 1790 through the present, from country through tract level.