1872 |- | | nowrap | Aaron F. Perry (R) | style="font-size:80%" | Resigned July 14, 1872 | nowrap | Ozro J. Dodds (D) | October 9, 1872 |- | | nowrap | Thomas J. Speer (R) | style="font-size:80%" | Died August 18, 1872 | nowrap | Erasmus W. Beck (D) | December 2, 1872 |- | | nowrap | Julius L. Strong (R) | style="font-size:80%" | Died September 7, 1872 | nowrap | Joseph R. Hawley (R) | December 2, 1872 |- | | nowrap | Ulysses Mercur (R) | style="font-size:80%" | Resigned December 2, 1872, after becoming an assoc. justice of the Supreme Court of Pennsylvania | nowrap | Frank C. Bunnell (R) | December 24, 1872 |- | | nowrap | John L. Beveridge (R) | style="font-size:80%" | Resigned January 4, 1873, after being elected Lieutenant Governor of Illinois | Vacant | Not filled this term |- | | nowrap | Robert C. De Large (R) | style="font-size:80%" | Seat declared vacant January 24, 1873, after election was contested by Christopher C. Bowen | Vacant | Not filled this term |- | | nowrap | Josiah T. Walls (R) | style="font-size:80%" | Lost contested election January 29, 1873 | nowrap | Silas L. Niblack (D) | January 29, 1873 |} Committees Senate Agriculture (Chairman: Frederick T. Frelinghuysen; Ranking Member: Henry G. Davis) Appropriations (Chairman: Lot M. Morrill; Ranking Member: William Windom) Audit and Control the Contingent Expenses of the Senate (Chairman: Matthew H. Carpenter; Ranking Member: Eli Saulsbury) Civil Service and Retrenchment (Chairman: George G. Wright; Ranking Member: N/A) Claims (Chairman: John Scott; Ranking Member: Arthur I. Boreman) Commerce (Chairman: Zachariah Chandler; Ranking Member: William A. Buckingham) Distributing Public Revenue Among the States (Select) District of Columbia (Chairman: John F. Lewis; Ranking Member: Frederick A. Sawyer) Education and Labor (Chairman: James W. Flanagan; Ranking Member: James W. Patterson) Engrossed Bills (Chairman: Thomas F. Bayard; Ranking Member: Thomas M. Norwood) Finance (Chairman: John Sherman; Ranking Member: Adelbert Ames) Foreign Relations (Chairman: Simon Cameron; Ranking Member: Carl Schurz) Indian Affairs (Chairman: William A. Buckingham; Ranking Member: Henry Wilson) Investigation and Retrenchment (Chairman: William A. Buckingham; Ranking Member; William M. Stewart) Judiciary (Chairman: George F. Edmunds; Ranking Member: Frederick T. Frelinghuysen) Manufactures (Chairman: Thomas J. Robertson; Ranking Member: Abijah Gilbert) Military Affairs (Chairman: John A. Logan; Ranking Member: John A. Logan) Mines and Mining (Chairman: Hannibal Hamlin; Ranking Member: Alexander