The collective Senate membership of nearly 2,000 men and women is documented in the Biographical Directory of the United States Congress. In 2005, continuing a nearly 150-year tradition, this 2,218-page volume was reprinted.

The Biographical Directioryprint edition is complemented and enhanced by a frequently updated web edition. The web edition can be searched by name, state, position, or the year served in Congress. In addition to member biographies, the online database features extensive bibliographies and information on research collections that include papers of senators and representatives.

In addition to the Biographical Directory, the Senate website provides several other tools to help researches find out more about the men and women who have served in the Senate. Featured Biographies provide a look at the varied experiences and accomplishments of selected U.S. senators. The Statistics and Lists: Senators page provides information about senators' biographical characteristics, Senate service records, honors and accomplishments, vital statistics, and much more.