There were two elections to the United States House of Representatives to serve in the 99th United States Congress.
Elections are listed by date and district.
|- ! | Gillis William Long | | Democratic | 1962 | | Incumbent died January 20, 1985.<br/>New member elected to finish her husband's term March 30, 1985.<br/>Democratic hold. | nowrap |
|- ! | Sam B. Hall | | Democratic | 1976 | | Incumbent resigned May 27, 1985 to become a U.S. District Judge.<br/>New member elected August 3, 1985.<br/>Democratic hold. | nowrap |