Directories: A Finding Guide: U.S.: Federal Government

Online, open access.
"...prepared by the Joint Committee on Printing (JCP)."
Contents include
* Short biographies of each member of the Senate and House, listed by state or district.
* Committee memberships, terms of service, administrative assistants and/or secretaries, and room and telephone numbers for Members of Congress.
* Officials of the courts, military establishments, and other Federal departments and agencies, including D.C. government officials, governors of states and territories, foreign diplomats, and members of the press, radio, and television galleries.

Online.
Subscription resource.
Print version is called The Almanac of American Politics (latest year is shelved in Olin Library Ready Reference JK 1010 .B26).
Similar to Politics in America, but from a different publisher. Includes committee assignments, staff, and caucus affiliations of all members of Congress.

In CQ Press Library.
Ceased online publication with 2018. Ceased print publication with 2014 as CQ's Politics in America.
Contact and background information for all U.S. Representatives and Senators.

Online, public access.
"...provides comprehensive information on the agencies of the legislative, judicial, and executive branches of the U.S. Federal Government. It also includes information on quasi-official agencies, selected U.S.-participating international organizations, and other Federal boards, commissions, and committees.

The online database version of the Government Manual is updated regularly to reflect changes in Government throughout the year." [Description]

Recent editions are online only.
In CQ Press Library.
Subscription.
"...contact and descriptive information on more than 10,000 federal government offices, regulatory agencies, congressional committees, judicial offices, public interest groups, nongovernmental organizations, and international organizations."