FedStats
official statistical information produced by the Federal Government

Census Bureau & American Factfinder
for demography, business, trade and housing information

Statistical Abstract of the United States
Statistics on social and economic conditions in the United States

Bureau of Justice Statistics
for criminals and victims, law enforcement & jails

Bureau of Labor Statistics
for employment, wages, consumer expenditure and inflation

Bureau of Economic Analysis
for macro-economic trends and gross domestic product

Bureau of Transportation Statistics
for air, rail, freight and passenger

Energy Information Administration
for production, comsumption and trade

Environmental Protection Agency
for air and water quality & toxic spills for individual facilities

Internal Revenue Service
for corporate and individual tax returns

National Agricultural Statistics Service
for crops and livestock

National Center for Education Statistics
for K-university schools, libraries, students, staff, test scores, outcomes of education

National Center for Health Statistics
for births, disease, deaths, behavioral risk and drug abuse

American Religion Data Archive
for county-level data on church membership

Adherents
for religion for countries of the world

Annie B. Casey Foundation
for state-by-state child welfare indicators

David Leip's U.S. Election Atlas
for historical United States election statistics

FEC Info & Center for Responsive Politics
for understandable campaign finance expenditures

The Gallup, PEW, & Zogby
for public opinion polls

Kaiser Family Foundation
for state-level health insurance data