U.S. GOVERNMENT

Commerce Department- has an aquarium with a shark on the basement level!
EPA- Environmental Protection Agency
Department of Education
Department of Energy
Interior Department has a branch office in Herndon, VA
Justice Department-
Health & Human Services Department
Veterans Affairs Department

SMALLER OR INDEPENDENT AGENCIES

FBI-Federal Bureau of Investigation
FAA- Federal Aviation Administration
Fish and Wildlife Service
GSA- General Services Administration
Library of Congress World Wide Web
FCC- Federal Communications Commission
NASA-National Aeronautics and Space Administration
NOAA- National Oceanic and Atmospheric Administration
NIH- National Institutes of Health
National Institute of Standards and Technology-located in Springfield, VA
National Library of Medicine
Patent and Trademark Office located in Crystal City, Arlington, VA
U.S.G.S.- U.S. Geological Survey- located in Reston, VA- Exhibits, slide shows and more. Worth a visit!
U.S. Naval Observatory
SBA- Small Business Administration
Social Security Administration

OTHER U.S. GOVERNMENT SOURCES

FedWorld Information Network- source of federal government information
Income Tax Forms and Publications