ICPSR (Interuniversity Consortium for Political and Social Sciences Research): The largest Behavioral and Social Science data archive in the United States. ICPSR is a unit within the Universty of Michigan Institute for Social Research and its office is in Ann Arbor. UM-Dearborn is one of ICPSR's 760 member institutions.
PEW Social and Demographic Trends: Datasets from studies of behaviors and attitudes of Americans in key realms of their lives
Professor Aronson's List of Quantitative Datasets