West Virginia(2) | nowrap | Matthew M. Neely (D) | Died January 18, 1958.Successor appointed January 25, 1958. | nowrap | John D. Hoblitzell Jr. (R) | January 25, 1958 |- | North Carolina(2) | nowrap | W. Kerr Scott (D) | Died April 16, 1958.Successor appointed April 19, 1958, and then elected November 4, 1958. | nowrap | B. Everett Jordan (D) | April 19, 1958 |- | West Virginia(2) | nowrap | John D. Hoblitzell Jr. (R) | Interim appointee lost special election.Successor elected November 4, 1958. | nowrap | Jennings Randolph (D) | November 5, 1958 |- | California(1) | nowrap | William F. Knowland (R) | Resigned early January 2, 1959. | Vacant | Not filled this term |} House of Representatives |- | | Vacant | Rep. Antonio M. Fernández died during previous congress. | | Joseph Montoya (D) | April 9, 1957 |- | | Vacant | Rep. T. Millet Hand died during previous congress. | | Milton W. Glenn (R) | November 5, 1957 |- | | | James Bowler (D) | Died July 18, 1957. | | Roland V. Libonati (D) | December 31, 1957 |- | | | Samuel K. McConnell Jr. (R) | Resigned September 1, 1957, after becoming Executive Director of the United Cerebral Palsy Associations | | John A. Lafore Jr. (R) | November 5, 1957 |- | | | Henderson L. Lanham (D) | Died November 10, 1957. | | Harlan E. Mitchell (D) | January 8, 1958 |- | | | Augustine B. Kelley (D) | Died November 20, 1957. | | John H. Dent (D) | January 21, 1958 |- | | | W. Sterling Cole (R) | Resigned December 1, 1957, after becoming Director General of the International Atomic Energy Agency. | | Howard W. Robison (R) | January 14, 1958 |- | | | Jere Cooper (D) | Died December 18, 1957. | | Fats Everett (D) | February 1, 1958 |- | | | Earl Chudoff (D) | Resigned January 5, 1958, after being elected judge of the Philadelphia Court of Common Pleas No. 1. | | Robert N.C. Nix Sr. (D) | May 20, 1958 |- | | | Vincent J. Dellay (R) | Changed political affiliation some time in 1958. | | Vincent J. Dellay (D) | ????, 1958 |- | | | Russell W. Keeney (R) | Died January