Senators' and representatives' offices are housed in the Capitol Building as well as in six other buildings listed below. Despite this, constituents can write to their senators and representatives as follows:
Senator's name United States Senate Washington, DC 20510
Representative's name United States House of Representatives Washington, DC 20515
Most government departments and agencies have their own ZIP Codes; the correct one should be used. The Senate ZIP Code differs from that of the House. All Senate office buildings have the 20510 ZIP Code, and all House office buildings have the 20515 ZIP Code.
Listings of specific addresses of members of Congress are in the more current edition of The Congressional Staff Directory or Congressional Quarterly's Washington Directory , both of which are available in local libraries. These books also list the home offices of members of Congress. Local telephone directories may also be consulted.
Both the Senate and House have offices in the Capitol Building, but additional offices are housed at the following buildings:
Dirksen Senate Office Building Constitution Avenue between 1st and 2nd Streets, NE Hart Senate Office Building 2nd Street and Constitution Avenue, NE Russell Senate Office Building Constitution Avenue between Delaware Avenue and 1st Street, NE
Cannon House Office Building Independence Avenue between C and First Streets, SE Longworth House Office Building Independence Avenue between C and South Capitol Streets, SE Rayburn House Office Building Independence Avenue between South Capitol and First Streets, SE