- Harvard-MIT Data Center -- HMDC is the principal distributor of quantitative social science data from major international data consortia for Harvard and MIT.
- Council of European Social Science Data Archives CESSDA members include major European social science data archives. Their web page has a clickable map of European archives.
- European Union Guide to Survey Data Archives and Centers
- Inter-University Consortium for Political and Social Research Data Archive -- ICPSR supplies data files for use with statistical software, such as SAS, SPSS, and Stata.
- Kaiser Network Health Poll Search – A free searchable database of question level public opinion data
- Odum Institute for Research in Social Science – The Odum Institute Contains several specialized archives of public opinion data, including many state polls.
- Polling the Nations -- (Harvard ID / PIN required)
- Roper Center for Public Opinion Research -- An archive, preserving the data from polls conducted by many leading survey research organizations for the use of researchers, students, and journalists.
- Virtual Data Center -- An operational, open-source, digital library to enable the sharing of quantitative research data.