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There are a vast number of resources - those available through the UCSD library and those that are free - that may be helpful in your research. I've listed below some of the best places to get started, but you may have to go beyond these sources. If so, I recommend reviewing the library's Data and Statistics guide, which links to a large number of databases and websites.
The Inter-University Consortium for Political and Social Research. World's largest archive of social science data. Election data, opinion polls, more. Special collections on Health, Education, Aging, Crime, Substance Abuse. Raw data; no tables. To download data, create a personal account using your ucsd.edu email address while accessing the database from a UC San Diego computer, UCSD-PROTECTED wireless, or the VPN.
1973-present. Huge database of citations to statistical publications from U.S. federal and state governments, international agencies, nonprofit and educational institutions, and private publishers including trade and industry groups. Full text of the publication or report is often included, and many tables are downloadable in Excel. Particularly good for demographic and country-level information. Previous name Statistical Universe.
1790-present. This site combines data from the U.S. Census of Population and Housing & the American Community Survey (ACS) with a user friendly interface, allowing the creation of maps & statistical tables. Census Tract boundaries are available back to 1940. Now also includes data on U.S. elections, business pattern, environmental summary, health, religion, and crime; the UK and Canadian censuses; Irish religious data; World Development Indicators, and EuroStat.