Executive Branch - President, Vice President, and Cabinet

Legislative Branch - Congress, Senate, and House of Representatives

Congressional Directory (In Library) JK1011: 1829-

Govinfo (Online) - govinfo provides free public access to official publications from all three branches of the Federal Government.

House of Representatives

Senate

Congress.gov
Provides access to legislative information from the 93rd Congress to the present. 

Judicial Branch - Supreme Court and Other Federal Courts
 

The White House - source for current information about the President's activities and programs, including press briefings and the latest presidential proclamations and directives. 

Information Sources for U.S. Presidents

A-Z Index of U.S. Government Departments and Agencies

U.S. Federal Government Agencies Directory (LSU)

Freedom of Information Act (FOIA) Offices and Resources - This research guide is made available through UC San Diego Libraries.

Ben's Guide to U.S. Government for Kids

• GPO Access - Portal to all the online publications archived by the Government Printing Office. It includes all major Congressional publications, and selected material from the Executive and Judicial branches.
   
• Govinfo - provides free public access to official publications from all three branches of the Federal Government.

• USA.gov - Official portal to U.S. government information, organized by topic.
• Google's U.S. Government Search Engine
   
• American FactFinder - Gateway to data from the decennial and economic censuses.
• Data.gov  "The purpose of Data.gov is to increase public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government."  

• Science.gov - A gateway to science information from U.S. Government agencies.

• Congress.gov - Provides access to legislative information from the 93rd Congress to the present.