45th United States Congress
Senate
replacements: 5 Democratic: 1 seat net gain Republican: 1 seat net loss deaths: 2 resignations: 3 interim appointments: 1 contested elections: 0 Total seats with changes: 5

45th United States Congress

Section Title: Senate
Table Section Text: replacements: 5 Democratic: 1 seat net gain Republican: 1 seat net loss deaths: 2 resignations: 3 interim appointments: 1 contested elections: 0 Total seats with changes: 5

State (class)	Vacator	Reason for change	Successor	Date of successor's formal installation

Ohio (3)	John Sherman (R)	Resigned March 8, 1877 to become U.S. Secretary of the Treasury. Successor elected March 21, 1877.	Stanley Matthews (R)	March 21, 1877

Pennsylvania (3)	Simon Cameron (R)	Resigned March 12, 1877. Successor elected March 20, 1877.	J. Donald Cameron (R)	March 20, 1877

Missouri (3)	Lewis V. Bogy (D)	Died September 20, 1877. Successor was appointed September 29, 1877, to continue the term.	David H. Armstrong (D)	September 29, 1877

Indiana (3)	Oliver P. Morton (R)	Died November 1, 1877. Successor elected January 31, 1879.	Daniel W. Voorhees (D)	November 6, 1877

Missouri (3)	David H. Armstrong (D)	Interim appointee retired. Successor elected January 26, 1879.	James Shields (D)	January 27, 1879

Michigan (1)	Isaac P. Christiancy (R)	Resigned February 10, 1879 due to ill health. Successor elected February 22, 1879.	Zachariah Chandler (R)	February 22, 1879

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