Columns: District | Vacator | Reason for change | Successor | Date successor seated
New Jersey 2nd | Vacant | Rep. T. Millet Hand died during previous congress | Milton W. Glenn (R) | November 5, 1957 | Illinois 7th | James Bowler (D) | Died July 18, 1957 | Roland V. Libonati (D) | December 31, 1957 | Georgia 7th | Henderson L. Lanham (D) | Died November 10, 1957 | Harlan E. Mitchell (D) | January 8, 1958 | Pennsylvania 21st | Augustine B. Kelley (D) | Died November 20, 1957 | John H. Dent (D) | January 21, 1958 | Tennessee 8th | Jere Cooper (D) | Died December 18, 1957 | Robert "Fats" Everett (D) | February 1, 1958 | New Jersey 14th | Vincent J. Dellay (R) | Changed political affiliation some time in 1958 | Vincent J. Dellay (D) | ????, 1958 | Illinois 14th | Russell W. Keeney (R) | Died January 11, 1958 | Vacant | Not filled this term | Minnesota 1st | August H. Andresen (R) | Died January 14, 1958 | Al Quie (R) | February 18, 1958 | Wisconsin 1st | Lawrence H. Smith (R) | Died January 22, 1958 | Vacant | Not filled this term | New Mexico At-large | John J. Dempsey (D) | Died March 11, 1958 | Vacant | Not filled this term | Louisiana 8th | George S. Long (D) | Died March 22, 1958 | Vacant | Not filled this term | Illinois 4th | William E. McVey (R) | Died August 10, 1958 | Vacant | Not filled this term | Pennsylvania 28th | Herman P. Eberharter (D) | Died September 9, 1958 | Vacant | Not filled this term | Illinois 20th | Sid Simpson (R) | Died October 26, 1958 | Vacant | Not filled this term