The Statistical Abstract of the United States, published since 1878, is the authoritative and comprehensive summary of statistics on the social, political, and economic organization of the United States. Sources of data include the Census Bureau, Bureau of Labor Statistics, Bureau of Economic Analysis, and many other Federal agencies and private organizations.
The State Data Center (SDC) program is a state/Census Bureau cooperative program that disseminates census and other data to the public through a network of over 1,800 state and local agencies, libraries, universities, chambers of commerce, and others.
Includes a massive collection of free databases from the United Nations (UN). You may target a specific dataset or do a mass search. Types of information available relate to economic development, human rights, energy resources, commodities, labor, gender issues and more.