Columns: District | Vacator | Reason for change | Successor | Date successor seated
Oklahoma 7th | Sam C. Massingale (D) | Died January 17, 1941 | Victor Wickersham (D) | April 1, 1941 | New York 17th | Kenneth F. Simpson (R) | Died January 25, 1941 | Joseph C. Baldwin (R) | March 11, 1941 | Alabama 7th | Walter W. Bankhead (D) | Resigned February 1, 1941 | Carter Manasco (D) | June 24, 1941 | Maryland 6th | William D. Byron (D) | Died February 27, 1941 | Katharine Byron (D) | May 27, 1941 | New York 42nd | Pius L. Schwert (D) | Died March 11, 1941 | John C. Butler (R) | April 22, 1941 | North Carolina 5th | Alonzo D. Folger (D) | Died April 30, 1941 | John H. Folger (D) | June 14, 1941 | New York 14th | Morris M. Edelstein (D) | Died June 4, 1941 | Arthur G. Klein (D) | July 29, 1941 | Wisconsin 1st | Stephen Bolles (R) | Died July 8, 1941 | Lawrence H. Smith (R) | August 29, 1941 | Pennsylvania 15th | Albert G. Rutherford (R) | Died August 10, 1941 | Wilson D. Gillette (R) | November 4, 1941 | Colorado 4th | Edward T. Taylor (D) | Died September 3, 1941 | Robert F. Rockwell (R) | December 9, 1941 | California 17th | Lee E. Geyer (D) | Died October 11, 1941 | Cecil R. King (D) | August 25, 1942 | Massachusetts 7th | Lawrence J. Connery (D) | Died October 19, 1941 | Thomas J. Lane (D) | December 30, 1941 | Pennsylvania 11th | Patrick J. Boland (D) | Died May 18, 1942 | Veronica G. Boland (D) | November 3, 1942 | California 3rd | Frank H. Buck (D) | Died September 17, 1942 | Vacant until the next Congress | Vacant until the next Congress | Pennsylvania 25th | Charles I. Faddis (D) | Resigned December 4, 1942 to enter the US Army | Vacant until the next Congress | Vacant until the next Congress | Illinois 6th | A. F. Maciejewski (D) | Resigned December 6, 1942 | Vacant until the next Congress | Vacant until the next Congress