From the GPO:
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.
Lists of 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.
Browse the New Directory (114th Congress) and Previous Editions Online
Directories back to 105th Congress are available here.