Columns: District | Vacator | Reason for change | Successor | Date successor seated
Pennsylvania 18th | Robert J. Corbett (R) | Died April 25, 1971 | H. John Heinz III (R) | November 2, 1971 | Kentucky 6th | John C. Watts (D) | Died September 24, 1971 | William P. Curlin, Jr. (D) | December 4, 1971 | Pennsylvania 27th | James G. Fulton (R) | Died October 6, 1971 | William S. Conover (R) | April 25, 1972 | Alabama 3rd | George W. Andrews (D) | Died December 25, 1971 | Elizabeth B. Andrews (D) | April 4, 1972 | New York 20th | William Fitts Ryan (D) | Died September 17, 1972. | Vacant | Not filled this congress | Ohio 16th | Frank T. Bow (R) | Died November 13, 1972. | Vacant | Not filled this congress