(D) . Tom Foley (D) . Norm Dicks (D) . Mike Lowry (D) West Virginia (4 Democrats) . Bob Mollohan (D) . Harley Orrin Staggers (D) . John M. Slack Jr. (D), until March 17, 1980 John G. Hutchinson (D), from June 30, 1980 . Nick Rahall (D) Wisconsin (6–2 Democratic) . Les Aspin (D) . Robert Kastenmeier (D) . Alvin Baldus (D) . Clement J. Zablocki (D) . Henry S. Reuss (D) . Tom Petri (R), from April 3, 1979 . Dave Obey (D) . Toby Roth (R) . Jim Sensenbrenner (R) Wyoming (1 Republican) . Dick Cheney (R) Non-voting members (4–1 Democratic) . Walter Fauntroy (D) . Antonio Borja Won Pat (D) . Baltasar Corrada del Rio (PNP) . Melvin H. Evans (R) Changes in membership The count below reflects changes from the beginning of the first session of this Congress. Senate Replacements: 4 Democratic: 3 seat net loss Republican: 3 seat net gain Deaths: 0 Resignations: 4 Vacancy: 0 Total seats with changes: 4 |- | nowrap | Maine(Class 1) | nowrap | Edmund Muskie(D) | Resigned May 7, 1980 to become United States Secretary of State.Successor appointed to finish the term. | nowrap | George J. Mitchell(D) | May 19, 1980 |- | nowrap | New Hampshire(Class 3) | nowrap | John A. Durkin(D) | Resigned December 29, 1980 to give successor priority in seniority.Successor appointed, having already been elected to the next term. | nowrap | Warren Rudman(R) | December 29, 1980 |- | nowrap | Florida(Class 3) | nowrap | Richard Stone(D) | Resigned December 30, 1980 to give successor priority in seniority.Successor appointed, having already been elected to the next term. | nowrap | Paula Hawkins(R) | January 1, 1981 |- | nowrap | Alabama(Class 3) | nowrap | Donald Stewart(D) | Resigned January 2, 1981 to give successor priority in seniority.Successor appointed, having already been elected to the next term. | nowrap | Jeremiah Denton(R) | January 2, 1981 |} House of Representatives Replacements: 7 Democratic: 0 seat net loss Republican: 0 seat net gain Deaths: 1 Resignations: 4 Expulsion: 1 Contested election: Total seats with changes: 10 |- | | Vacant | style="font-size:80%" | Rep. Leo Ryan died during previous congress | nowrap | William Royer (R) | April 3, 1979 |- | | Vacant | style="font-size:80%" | Rep. William A. Steiger died during previous congress | nowrap | Tom Petri