U.S. Census Bureau (formerly American Fact Finder) Data from the U.S. Census Bureau..
American FactFinder (now known as U.S. Census Bureau) Data from the U.S. Census Bureau.
Infoshare Online Demographic data for New York City, New York State, and the United States. See the video tutorial.
ICPSR (Inter-university Consortium for Political and Social Research) — must create login Access to social science data and analysis tools.