The Official Congressional Directory, 1999-2000, serves as a comprehensive reference for the United States government during that period. It provides detailed biographical information on Senators, members of Congress, and the Judiciary, offering insights into the individuals shaping national policy. The directory also meticulously lists committee assignments, maps of congressional districts, and contact details for officials within executive agencies, including addresses, telephone and fax numbers, and web addresses.

This directory is a factual compilation intended for reference purposes, providing essential contact and biographical information for government officials. Its value lies in its comprehensive and organized presentation of data relevant to the legislative and executive branches of the U.S. government for the 1999-2000 period. As a government publication, it is expected to be a reliable source for researchers, journalists, and citizens seeking to understand the structure and personnel of government.