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.
Congressional Research Service (CRS) Reports
"CRS serves as nonpartisan shared staff to congressional committees and Members of Congress. It operates solely at the behest of and under the direction of Congress. Information in a CRS Report should not be relied upon for purposes other than public understanding of information that has been provided by CRS to Members of Congress in connection with CRS’s institutional role. CRS Reports, as a work of the United States Government, are not subject to copyright protection in the United States. Any CRS Report may be reproduced and distributed in its entirety without permission from CRS. However, as a CRS Report may include copyrighted images or material from a third party, you may need to obtain the permission of the copyright holder if you wish to copy or otherwise use copyrighted material. "
All non-confidential CRS Reports are now available (or becoming available) on congress.gov. Until 2019, access was limited (See this interesting Wikipedia page about the history of the CRS and its reports).
"...which automatically harvests over 1000 different sources from federal, state and local open data sources to provide a comprehensive catalog of open government data..."
Access demographic, economic and population data from the U.S. Census Bureau. Explore census data with visualizations and more.
USA.gov™ is the U.S. government's official web portal, sponsored by the General Services Administration. The site offers a search of government web pages, government web pages by topic, access to government forms, and pages for citizens, business, government personnel, and visitors to the U.S.
Federal metasites (FDLP Community, S. Beleu, 2-2011)