Bureau of Economic Analysis
The Bureau of Economic Analysis collection information on national and international trade, accounts, industry, and economic indicators. BEA maintains a section of its website titled "The U.S. Economy at a Glance," which highlights their most influential economic indicators.
Bureau of Justice Statistics (BJS)
As the United States' principal source for criminal justice statistics, BJS collects and publishes statistics on all aspects of criminal justice in the United States at teh state, federal, and tribal levels. Crimes by type (violent, property, indenity theft, hate crime, etc.) or victim, corrections populations and facilities, and court systems are covered as well as noncriminal aspects of the justice system, including law enforcement personnel and behavior statistics.
Census Bureau
The Census Bureau is known for collecting information about the population of the United States. You can find demographic information about a state, city, county, or a zip code.
Core Documents of U.S. Democracy
Includes links to digital versions of the Bill of Rights, Declaration of Independence, Lincoln papers, major Supreme Court decisions, and more
Economic Research Service (ERS)
The second principal statistcal agency operated under the USDA, ERS, like NASS, collects information on agriculture in the United States. However, ERS collects with an eye more toward the economics of agriculture and related fields. Food safety and prices, commodity markets, the rural economy, and agricultural income are covered among other topics.
Energy Information Administration
Fossil fuels (petroleum, natural gas, coal), nuclear power, and renewable resources make up the energy production portfolio of the United States, and the EIA keeps track of them all from extraction to consumption at the state and national level, as well as international indicators.
FindLaw: Supreme Court Decisions
Searchable. Includes opinions published since 1937.
GPO
"The U.S. Government Publishing Office (GPO) is the Federal Government’s official, digital, secure resource for producing, procuring, cataloging, indexing, authenticating, disseminating, and preserving the official information products of the U.S. Government."
National Archives, The
The National Archives and Records Administration (NARA) is the nation's record keeper. The site includes historical documents and military records.
Statistical Abstract of the U.S.
This resources "contains a collection of statistics on social and economic conditions in the United States. Selected international data are also included."