99th United States Congress Changes in membership House of Representatives

| District | Vacator | Reason_for_change | Successor | Date_successor_seated_ |
|---|---|---|---|---|
| Indiana`s 8th | Disputed | House declared McCloskey the winner after auditors from the US General Accounting Office conducted a recount and Republican floor votes were rejected | Frank McCloskey (D) | May 1, 1985 |
| Louisiana`s 8th | Gillis W. Long (D) | Died January 20, 1985 | Catherine S. Long (D) | March 30, 1985 |
| Texas`s 1st | Sam B. Hall (D) | Resigned May 27, 1985 after being appointed judge for the US District Court for the Eastern District of Texas | Jim Chapman (D) | August 3, 1985 |
| New York`s 6th | Joseph P. Addabbo (D) | Died April 10, 1986 | Alton R. Waldon, Jr. (D) | June 10, 1986 |