The U.S. Government, unlike many foreign countries, does not have a single agency responsible for producing statistics. This is done by many federal agencies with some duplication of effort occurring. These statistics are compiled by government agencies because Congress requires such statistics to be compiled as part of its constitutional oversight & funding responsibilities. Some of these statistics may only be collected temporarily while others have been collected throughout U.S. History. This site features lists of multiple U.S. Government statistical agencies. Many of these agencies, such as the Census Bureau, date to the earliest years of the U.S., while other agencies, such as the Bureau of Transportation Statistics, are relatively recent creations.