Cornell University's Institute for Social and Economic Research maintains this guide to datasets available on the internet, data producers/distributors, and a wealth of other resources for locating and using data.

CSISS maintains a catalog of websites that "provide spatial information, tools, and research to aid spatial analysis efforts in the social sciences."

Provides access to an archive of online social science data, training facilities in basic and advanced techniques of quantitative social analysis. Provides a comprehensive list of ICPSR resources and services, information on membership and governance, links to national data archives affiliated with ICPSR, and contact information.

Provides access to data from nearly a half million questions asked on national public opinion surveys, 1935 to present. Users can search the "iPOLL Databank" which is organized at the question level or search at the dataset level using "RoperExpress" which allows immediate download of about 75% of the Center's public opinion studies conducted in the US from 1935 to present, and many recent studies from outside of the US.