99th United States Congress Changes in membership House of Representatives

| District | Vacator | Reason_for_change | Successor | Date_successor_seated_ |
|---|---|---|---|---|
| Hawaii`s 1st | Cecil Heftel (D) | Resigned July 11, 1986 | Neil Abercrombie (D) | September 20, 1986 |
| North Carolina`s 10th | Jim Broyhill (R) | Resigned July 14, 1986 after being appointed to the US Senate | Cass Ballenger (R) | November 4, 1986 |
| Illinois`s 4th | George M. O`Brien (R) | Died July 17, 1986 | Vacant | Not filled this term |
| Illinois`s 14th | John E. Grotberg (R) | Died November 15, 1986 | Vacant | Not filled this term |
| North Carolina`s 3rd | Charles O. Whitley (D) | Resigned December 31, 1986 | Vacant | Not filled this term |