The Inter-University Consortium for Political and Social Research (ICPSR) maintains the world's largest archive of computerized, numeric social science data. Topics covered include demography, economics, health care, politics, social behavior, public opinion.
The Pew Research Center is a nonpartisan fact tank which studies U.S. politics and policy; journalism and media; internet, science and technology; religion and public life; Hispanic trends; global attitudes and trends; and U.S. social and demographic trends.
KIDS COUNT is a project of the Annie E. Casey Foundation and a premier source of data on children and families. Each year, the Foundation produces a comprehensive report — the KIDS COUNT Data Book — that assesses child well-being in the United States.