Congress.gov is the official website for U.S. federal legislative information. The site provides access to accurate, timely, and complete legislative information for Members of Congress, legislative agencies, and the public. It is presented by the Library of Congress (LOC) using data from the Office of the Clerk of the U.S. House of Representatives, the Office of the Secretary of the Senate, the Government Publishing Office, Congressional Budget Office, and the LOC's Congressional Research Service.
Congress.gov is usually updated the morning after a session adjourns. Consult Coverage Dates for Congress.gov Collections for the specific update schedules and start date for each collection.
Congress.gov supersedes the THOMAS system which was retired on July 5, 2016. Congress.gov was released in beta in September 2012. The THOMAS URL was redirected to Congress.gov in 2013. The beta label was removed in 2014.
The scope of data collections and system functionality have continued to expand since THOMAS was launched in January 1995, when the 104th Congress convened. THOMAS was produced after Congressional leadership directed the Library of Congress to make federal legislative information freely available to the public.
Congressional documents from the first 100 years of the U.S. Congress (1774-1875) can be accessed through A Century of Lawmaking.