Inter-University Consortium for Political and Social Research (ICPSR)
The Inter-University Consortium for Political and Social Research (ICPSR) is a network of approximately 700 universities, government agencies, and other institutions. Faculty, staff, and students of member institutions have full direct access to the data archive and to all of ICPSR's services. Some data are available to all researchers. The ICPSR data collections cover mainly the USA, but the catalog includes a section for international.data.
Mainly USA, but also international
ICPSR (University of Michigan, Ann Arbor)