Use the following links to find statistical data
Bureau of Labor Statistics - Includes National Longitudinal Surveys, amongst many other statistics relating to the workforce.
Center for Disease Control (CDC) - National health statistics, including wellness, violence, and full reports.
Data and Statistics about the USA - Employment statistics, governmental stats (public policy) such as food, energy, economy, and much more.
General Social Survey - The GSS "contains a standard 'core' of demographic, behavioral, and attitudinal questions, plus topics of special interest. Many of the core questions have remained unchanged since 1972 to facilitate time-trend studies as well as replication of earlier findings."
National Center for Education Statistics (NCES) - Contains a digest of statistics, and other searchable tables and figures. This includes National Assessment of Educational Progress, Early Childhood Longitudinal Study, National Household Educational Surveys Program, Education Longitudinal Study, and Schools and Staffing Survey.
Panel Study of Income Dynamics - The "longest running longitudinal household study in the world."