The US government

National Institutes of Health (NIH)	United States Postal Service (USPS)	Internal Revenue Service (IRS)	National Oceanic and Atmospheric Administration (NOAA)
U.S. Department of State	Library of Congress	US Patent and Trademark Office (USTPO)	Centers for Disease Control and Prevention
ZIP Code Look-Up	U.S. Department of Education (ED)	U.S. Geological Survey (USGS)	Securities and Exchange Commission (SEC)
Voice of America (VOA)	National Park Service: Parknet	The White House	US Census Bureau
Central Intelligence Agency (CIA)	Southern Region Headquarters	Immigration and Naturalization Service (Employment)	U.S. Department of Agriculture
Food and Drug Administration	ANL Managing Contractor	U.S. Army	National Institute of Standards and Technology (NIST)
U.S. Navy	Federal Trade Commission (FTC)	USAJobs - United States Office Of Personnel Management	Environmental Protection Agency
Bureau of Consular Affairs	Office of Personnel Management (OPM)