U.S. Agency for International Development
Agriculture, Department of
Air Force
Army
Bureau of Economic Analysis
Bureau of Indian Affairs
Bureau of Labor Statistics
Census Bureau
Centers for Disease Control
Central Intelligence Agency
Coast Guard
Commerce, Department of
Consumer Product Safety Commission
Council on Environment Quality
Defense, Department of, DefenseLINK
Education, Department of
Energy, Department of
U.S. Environmental Protection Agency
Federal Bureau of Investigation
Federal Communications Commission
Federal Deposit Insurance Corporation (FDIC)
Federal Emergency Management Agency
U.S. Fish and Wildlife Service
Food and Drug Administration
General Services Administration
U.S. Geological Survey
Health and Human Services, Department of
U.S. House of Representatives
Housing and Urban Development, Department of
U.S. Information Agency
Interior, Department of the
Internal Revenue Service (IRS)
Tax Forms and Publications
International Trade Commission
Joint Chiefs of Staff
Justice, Department of
Library of Congress
Marine Corps
National Aeronautics and Space Administration (NASA)
National Archives and Records Administration
National Institutes of Health
National Marine Fisheries Service
National Oceanic and Atmospheric Administration (NOAA)
National Park Service
National Science Foundation
Navy
Nuclear Regulatory Commission
Occupational Safety and Health Administration (OSHA)
Patent and Trademark Office
U.S. Postal Service
Securities and Exchange Commission
U.S. Senate
Small Business Administration
Smithsonian Institution
Social Security Administration
State, Department of
Transportation, Department of
Treasury, Department of the
Veterans Affairs, Department of
White House

You might also benefit from looking at the homepages of other depository libraries from around the country. The University of Idaho has a great site which allows you to do just that.