Columns: District | Vacator | Reason for change | Successor | Date successor seated
Michigan 7th | Donald W. Riegle, Jr. (R) | Switched party affiliation | Donald W. Riegle, Jr. (D) | February 27, 1973 | Maryland 1st | William Mills (R) | Committed suicide May 24, 1973 | Robert Bauman (R) | August 21, 1973 | Pennsylvania 12th | John Saylor (R) | Died October 28, 1973 | John Murtha (D) | February 5, 1974 | Michigan 5th | Gerald Ford (R) | Resigned December 6, 1973 to become Vice President | Richard VanderVeen (D) | February 18, 1974 | California 13th | Charles Teague (R) | Died January 1, 1974 | Robert Lagomarsino (R) | 1974-03-05 | Ohio 1st | William Keating (R) | Resigned January 3, 1974 | Tom Luken (D) | March 5, 1974 | California 6th | William Mailliard (R) | Resigned March 5, 1974 | John Burton (D) | 1974-06-04 | California 10th | Charles S. Gubser (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | California 19th | Chester E. Holifield (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | California 32nd | Craig Hosmer (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | California 34th | Richard T. Hanna (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Illinois 24th | Kenneth J. Gray (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Kentucky 1st | Frank Stubblefield (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Massachusetts 3rd | Harold Donohue (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Michigan 6th | Charles E. Chamberlain (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Michigan 17th | Martha Griffiths (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Minnesota 2nd | Ancher Nelsen (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Minnesota 8th | John Blatnik (DFL) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Nebraska 3rd | David T. Martin (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | New Jersey 7th | William B. Widnall (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | New York 14th | John J. Rooney (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | New York 15th | Hugh L. Carey (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | New York 29th | Carleton J. King (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | New York 37th | Thaddeus J. Dulski (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Ohio 23rd | William Minshall (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Oregon 3rd | Edith S. Green (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Pennsylvania 25th | Frank M. Clark (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | South Carolina 3rd | W.J. Bryan Dorn (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | South Carolina 5th | Thomas S. Gettys (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Texas 21st | O. C. Fisher (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Washington 3rd | Julia B. Hansen (D) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress | Wisconsin 3rd | Vernon W. Thomson (R) | Resigned December 31, 1974 | Remained vacant until next Congress | Remained vacant until next Congress