Elections are listed by date and district.
|Alaska at-large||Nick Begich||Democratic||1970||Incumbent lost in a plane crash and declared dead.
New member elected March 6, 1973.
|Louisiana 2||Hale Boggs||Democratic||1940||Incumbent lost in a plane crash and declared dead pursuant to H.Res. 1 January 3, 1973.
New member elected March 20, 1973.
|Maryland 1||William Mills||Republican||1971 (Special)||Incumbent died May 24, 1973.
New member elected August 21, 1973.
|Illinois 7||George W. Collins||Democratic||1970 (Special)||Incumbent member-elect died December 8, 1972 during the previous congress.
New member elected June 5, 1973.