Find various data sets that cover politics, science, economics, sports and more. The data is downloadable and had brief explanations on how the data was sourced.
ICPSR maintains a data archive of more than 350,000 files of research in the social and behavioral sciences. It hosts 23 specialized collections of data in education, aging, criminal justice, substance abuse, terrorism, and other fields.
Run by Cornell University, the Roper Center archive consists of over 24,000 datasets from public opinion surveys dating back to the 1930s.
Note: Many of the datasets on this website are free - others do require a paid membership.
Explore data from the United State's census. Find demographic data, surveys such as the American Community and American Housing surveys, and government statistics here.