United States Statistical Sources

Fedstats
Statistical Universe (State University System only)
United States Statistical Abstract 2011 (Previous years HERE)

Agriculture

Agricultural Publications (USDA) (Outlook Reports)
Agricultural Statistical Indicators
Agricultural Statistics (Annual - 1994-2010)
Agricultural Statistics Service
Commodity Forecasts
Census of Agriculture
Economic Research Service
U.S. Statistical Abstracts (2011) ( Earlier Editions)

Computers

Digital Nation: Expanding Internet Use (Feb, 2011 National Telecommunications and Information Administration Report)

Crime

Bureau of Justice Statistics
Criminal Offenders
    Drugs and Crime
    Key Facts
    Firearms and Crime
    Victimization
Bureau of Prisons
Quick Facts
Publications
Death Penalty
    Capital Punishment (Bureau of Justice Statistics, 2009)
   
Schools & Colleges
    Campus Crime (Office of Secondary Education)
    School Crime (National Center for Education Statistics)
Uniform Crime Reports 2010 - 1995 (FBI)
US Statistical Abstract 2011 (Previous Years HERE)
 

Economy

Bureau of Economic Analysis
Federal Reserve Board
Economic Research & Data
Statistical Releases

Education

National Center for Education Statistics
NCES Annual Reports
Briefing Room - Education (White House)

Elections

Federal Election Commission
2008 Results (Presidential)
Federal Election Statistics (Clerk of the House of Representatives, 2008 - 1920)

Energy

Energy Information Administration
Monthly Energy Review

Environment

Air Data (EPA)
National Park Useage
Water Resources (USGS)

Government

Federal, State, and Local Governments (U.S. Census Bureau)
Census of Governments (U.S. Census Bureau)
  

Health

National Cancer Institute Mortality Data
Center for Disease Control Scientific Data
Community Health Status Indicators
CDC Workplace Safety & Health Information
Health Care Financing Administration
National Center for Health Statistics
Morbidity & Mortality Weekly Report
Statistical Information (Centers for Disease Control)

Housing

Census Bureau (Choose "Housing" under the Topics Menu)
HUD Data Sets

Labor

Bureau of Labor Statistics
    BLS Data
Davis-Bacon Wage Determinations

Libraries

Library Statistics Program (National Center for Education Statistics)
    Academic Libraries
2008 (Initial Report) | 2006 | 2004

Public Library Usage Statistics, 2008-1992 (Institute of Museum & Library Services)

State Library Statistics, 2009-1994 (Institute of Museum & Library Studies)

Military

National Income and Products Accounts Tables
U.S. Statistical Abstract 2011 Report (Previous years HERE)

Population and Demographics

Census Bureau
    American Factfinder
    Census Publications
    Historical Census (totals by race, 1990 - 1790)
    Population
Historical Census (Univ. VA)

Social

Aging
Child & Family
Fertility (Census Bureau, 2008- 1976)
Immigration and Naturalization
Social Security

Taxes

Federal Taxes (Internal Revenue Service)
State Tax Collections (U.S. Census Bureau, 2010 Data)

Trade

ITA Statistics (U.S. International Trade Administration)
Trade DataWeb (U.S. International Trade Commission. You must first create a free account)
Trade Statistics (U.S. Customs)
Global Agricultural Trade System Statistics

Transportation

Bureau of Transportation Statistics (U.S. Transportation Department)
    Government Transportation Financial Statistics (2010-1994)
    National Transportation Data Archive
    Transportation Studies
    TranStats
National Center for Statistics and Analysis (National Highway Traffic Safety Administration)