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The U.S. Census Bureau website is a good source for information about the U.S. population. It includes survey results arranged topically by category. The major categories include People & Households, Business & Industry, Geography, Newsroom, and Special Topics. There is also an alphabetical subject index and a site-specific search engine.
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. Formerly known as THOMAS
"GPO’s Federal Digital System (FDsys) provides free online access to official publications from all three branches of the Federal Government. Through FDsys, you are able to: 1) Search for documents and publications; 2) Browse for documents and publications 3) Access metadata about documents and publications — 4) Download documents and publications in multiple renditions or file formats"
Beta test site which will eventually replace FDSYS in 2017. This is designed to be more user friendly than FDSYS. Users can use basic, advanced, or citation searches and browse A-Z, by category, by Date, by Congressional Committee, and by Government Author (coming soon).
"Brought to you by USA.gov, Kids.gov is the official kids' portal for the U.S. government. We link kids, parents and teachers to U.S. government information and services on the web from government agencies, schools, and educational organizations, all geared to the learning level and interest of kids."