The Government Printing Office (GPO) recently made the official directory of the 114th U.S. Congress available on its govinfo website. The directory includes room and telephone numbers for members of the House and Senate, as well as committee memberships, district descriptions, and biographical information. It also contains personnel listings and contact information for executive agencies, federal courts, international organizations, foreign diplomatic offices, and press galleries. Previous editions of the directory going back to the 105th Congress (1997-1998) are available as well.
Govinfo is the GPO’s beta website, and will eventually replace the Federal Digital System (FDSys). You can learn more about govinfo and what’s available there on the Q&A page.