| style="font-size:80%" | Died June 25, 1870 | nowrap | Joseph Dixon (R) | December 5, 1870 |- | | nowrap | Noah Davis (R) | style="font-size:80%" | Resigned July 15, 1870, before being appointed U.S. Attorney for the Southern District of New York | nowrap | Charles H. Holmes (R) | December 6, 1870 |- | | nowrap | William Smyth (R) | style="font-size:80%" | Died September 30, 1870 | nowrap | William P. Wolf (R) | December 6, 1870 |- | | nowrap | Robert Ridgway (C) | style="font-size:80%" | Died October 16, 1870 | nowrap | Richard T. W. Duke (C) | November 8, 1870 |- | | nowrap | Robert C. Schenck (R) | style="font-size:80%" | Resigned January 5, 1871, after being appointed U.S. Ambassador to the United Kingdom | Vacant | Not filled this Congress |- | | nowrap | John Covode (R) | style="font-size:80%" | Died January 11, 1871 | Vacant | Not filled this Congress |- | | nowrap | John A. Logan (R) | style="font-size:80%" | Resigned at end of congress March 3, 1871, after being elected to the US Senate for the following term | Vacant | Not filled this Congress |- | | nowrap | Thomas W. Ferry (R) | style="font-size:80%" | Resigned at end of congress March 3, 1871, after being elected to the US Senate for the following term | Vacant | Not filled this Congress |} Committees Senate Agriculture (Chairman: Simon Cameron; Ranking Member: Abijah Gilbert) Appropriations (Chairman: Lot M. Morrill; Ranking Member: William Sprague IV) Audit and Control the Contingent Expenses of the Senate (Chairman: Orris S. Ferry; Ranking Member: Garrett Davis) Claims (Chairman: Timothy O. Howe; Ranking Member: Thomas J. Robertson) Commerce (Chairman: Zachariah Chandler; Ranking Member: Roscoe Conkling) Distributing Public Revenue Among the States (Select) District of Columbia (Chairman: James W. Patterson; Ranking Member: John S. Harris) Education (Chairman: Frederick A. Sawyer; Ranking Member: Henry W. Corbett) Engrossed Bills (Chairman: William A. Buckingham; Ranking Member: Daniel S. Norton) Finance (Chairman: John Sherman; Ranking Member: Willard Warner) Foreign Relations (Chairman: Charles Sumner; Ranking Member: Oliver P. Morton) Indian Affairs (Chairman: James Harlan; Ranking Member: William A. Buckingham) Judiciary (Chairman: Lyman Trumbull; Ranking Member: Benjamin F. Rice) Manufactures (Chairman: Oliver P. Morton; Ranking Member: Arthur I. Boreman) Memorial of Davis Hatch (Select) Military Affairs and the Militia (Chairman: Henry Wilson; Ranking Member: John M. Thayer) Mines