1. Department of Commerce. Census Bureau. Statistical Abstract of the United States. "Comprehensive summary of statistics on the social, political, and economic organization of the United States".
   • Other statistical compendia on the Find Federal Statistics and Find Federal Statistics tabs of Government Statistics.
   • To find particular publications, statistical programs, and/or agencies, try
     • FedStats (now Data and Statistics about the U.S.), provides access to data from 100+ federal agencies.
     • Lovejoy Library's PrimoVE catalog.
     • Catalog of U.S. Government Publications.
   • or even...
     • list of agencies and publications in Statistical Abstract of the United States, Appendix I - Guide to Sources of Statistics, State Statistical Abstracts, and Foreign Statistical Abstracts.
     • list of statistical programs in Statistical Abstract of the United States, Appendix III - Limitations of the Data.
2. Department of Commerce. Census Bureau. American Community Survey and Decennial Census via American FactFinder.
   • Social Explorer. Historical and current data from the U.S. Census, the American Community Survey, the American Religious Bodies (ASARB), and data on religion from InfoGroup. 
3. Department of Health and Human Services. Centers for Disease Control and Prevention. CDC Wonder. Public health data.

For more information, consult Government Statistics.