United States of America - Federal Statistical Information
Official Agency for statistical information produced by the Federal Government
http://fedstats.sites.usa.gov/

United States of America - Census Bureau
Bureau of the Census
http://www.census.gov/

United States of America - Bureau of Economic Analysis
Bureau of Economic Analysis
http://www.bea.gov/

United States of America - Bureau of Justice Statistics
Bureau of Justice Statistics
http://www.ojp.usdoj.gov/

United States of America - Bureau of Labor Statistics
Bureau of Labor Statistics
http://stats.bls.gov/

United States of America - Bureau of Transportation Statistics
Bureau of Transportation Statistics
http://www.bts.gov/

United States of America - Department of Commerce
Data portal to federal business, trade, and economic information
http://www.stat-usa.gov/

United States of America - Energy Information Administration
Official energy statistics from the U.S. Government
http://www.eia.doe.gov/

United States of America - National Center for Health Statistics
National Center for Health Statistics
http://www.cdc.gov/

United States of America - National Center for Education Statistics
National Center for Education Statistics
http://www.ed.gov/