Boston University has institutional access to comprehensive data sets across disciplines. You can search BU's Database List for those most relevant to you. Or, evaluate a few of the many available to you below:
ICPSR Inter-University Consortium for Political and Social Research
World's largest archive of computer readable social science data in education, aging, criminal justice, and other fields.
Roper Center Public Opinion Archives
Data from polls conducted by many leading survey organizations. Most of the data are from the United States, but over 50 nations are represented.
Trends and Policy: U.S. Healthcare
This collection contains all major healthcare related public laws and Congressional hearings, legislative and executive branch reports, and statistical data series.
Gale in Context: Opposing Viewpoints
Covers opposing sides of the most current social issues, from offshore drilling to immigration.
Wharton Research Data Services
Standard Rate & Data Service (SRDS)
Provides media advertising rates, contact information, circulation information, etc. for magazine, newspaper, television, direct marketing, radio, online, and out-of-home domestic and international markets.
Contains statistics from over 200 countries including social, economic and financial indicators.
Provides access to Direction of Trade Statistics, International Financial Statistics, etc.
Current and historical directories of U.S. businesses and consumers. Search businesses by company name, geographic area, business type, SIC code, and more.
Contains detailed consumer product and media data collected from a national sample of U.S. consumers.