Official website for the National Center for Health Statistics, a repository for numerous types of health and healthcare data. Maintained by the Centers for Disease Control and Prevention
Archive of data resources from research in the social and behavioral sciences, including 21 specialized collections of data in education, aging, criminal justice, substance abuse, terrorism, and other fields.
The U.S. Department of Health and Human Services' single-serve portal for access to health data from the federal government. Includes data from numerous federal agencies.
Official website of the Agency for Healthcare Research and Quality. Source of several important health policy data sets, including the Medical Expenditure Panel Survey and the Healthcare Cost and Utilization Project.