1866 and 1867 United States Senate elections
Races leading to the 40th Congress
In these general elections, the winners were elected for the term beginning March 4, 1867; ordered by state. All of the elections involved the Class 3 seats.

1866 and 1867 United States Senate elections

Section Title: Races leading to the 40th Congress
Table Section Text: In these general elections, the winners were elected for the term beginning March 4, 1867; ordered by state. All of the elections involved the Class 3 seats.

State	Incumbent	Results	Candidates

Senator	Party	Electoral history

Alabama	Vacant since January 21, 1861 when Benjamin Fitzpatrick (D) withdrew.	Legislature failed to elect during Civil War and Reconstruction. Seat remained vacant until 1868.	None.

Arkansas	Vacant since July 11, 1861 when Charles B. Mitchel (D) was expelled.	Legislature failed to elect during Civil War and Reconstruction. Seat remained vacant until 1868.	None.

California	James A. McDougall	Democratic	1860	Incumbent retired. Winner elected in 1866 or 1867. Republican gain.	√ Cornelius Cole (Republican) [Data unknown/missing.]

Connecticut	Lafayette S. Foster	Republican	1860	Incumbent lost re-election. Winner elected in 1866. Republican hold.	√ Orris S. Ferry (Republican) Lafayette S. Foster (Republican) [Data unknown/missing.]

Florida	Vacant since January 21, 1861 when David Levy Yulee (D) withdrew.	Legislature failed to elect during Civil War and Reconstruction. Seat remained vacant until 1868.	None.

Georgia	Vacant since January 28, 1861 when Alfred Iverson, Sr. (D) withdrew.	Winner elected in 1867. Senate refused to seat the winner. Seat remained vacant until 1871 when Georgia was readmitted.	√ Joshua Hill (Republican) [Data unknown/missing.]

Illinois	Lyman Trumbull	Republican	1854 or 1855 1861	Incumbent re-elected in 1867.	√ Lyman Trumbull (Republican) [Data unknown/missing.]

Iowa	Samuel J. Kirkwood	Republican	1865 (Special)	Incumbent lost nomination. Winner elected January 13, 1866. Republican hold.	√ James Harlan (Republican) 118 votes H. H. Trimble (Democratic) 20 votes

Indiana	Henry Lane	Republican	1860	Unknown if incumbent retired or lost re-election. Winner elected in 1867. Republican hold.	√ Oliver P. Morton (Republican) [Data unknown/missing.]

Kansas	Samuel C. Pomeroy	Republican	1861	Incumbent re-elected in 1867.	√ Samuel C. Pomeroy (Republican) [Data unknown/missing.]

Kentucky	Garrett Davis	Unionist	1861 (Special)	Incumbent re-elected in 1867 as a Democrat. Democratic gain.	√ Garrett Davis (Democratic) [Data unknown/missing.]

Louisiana	Vacant since February 4, 1861 when John Slidell (D) resigned.	Legislature failed to elect during Civil War and Reconstruction. Seat remained vacant until 1868.	None.

Maryland	John Creswell	Unconditional Unionist	1865 (Special)	Unknown if incumbent retired or lost re-election. Winner elected in 1866 or in 1867.	√ Philip Francis Thomas (Democratic) [Data unknown/missing.]

Missouri	B. Gratz Brown	Republican	1863 (Special)	Incumbent retired due to ill health. Winner elected in 1866 or 1867. Republican hold.	√ Charles D. Drake (Republican) [Data unknown/missing.]

Nevada	James W. Nye	Republican	1865	Incumbent re-elected in 1867.	√ James W. Nye (Republican) [Data unknown/missing.]

New Hampshire	George G. Fogg	Republican	1866 (Appointed)	Incumbent retired. Winner elected in 1866 or 1867. Republican hold.	√ James W. Patterson (Republican) [Data unknown/missing.]

New York	Ira Harris	Republican	1861	Incumbent lost renomination. Winner elected January 15, 1867. Republican hold.	√ Roscoe Conkling (Republican) Henry C. Murphy (Democratic) George F. Comstock (Democratic)

North Carolina	Vacant since March 11, 1861 when Thomas Clingman (D) resigned.	Legislature failed to elect during Civil War and Reconstruction. Seat remained vacant until 1868.	None.

Ohio	John Sherman	Republican	1861 (Special)	Incumbent re-elected in 1866.	√ John Sherman (Republican) [Data unknown/missing.]

Oregon	James Nesmith	Democratic	1860 or 1861	Incumbent lost re-election. Winner elected in 1866 or 1867. Republican gain.	√ Henry W. Corbett (Republican) [Data unknown/missing.]

Pennsylvania	Edgar Cowan	Republican	1861	Incumbent lost re-election. Winner elected January 15, 1867. Republican hold.	√ Simon Cameron (Republican) 61.65% Edgar Cowan (Republican) 36.84%

South Carolina	Vacant since November 11, 1860 when James Henry Hammond (D) withdrew.	Legislature failed to elect during Civil War and Reconstruction. Seat remained vacant until 1868.	None.

Vermont	Luke P. Poland	Republican	1865 (Appointed) 1866	Incumbent lost re-election. Winner elected in 1866. Republican hold.	√ Justin S. Morrill (Republican) Luke P. Poland (Republican) [Data unknown/missing.]

Wisconsin	Charles Durkee	Republican	1861	Incumbent re-elected in 1866.	√ Timothy O. Howe (Republican) [Data unknown/missing.]

Sentence(s)

Republican Ira Harris had been elected in 1861.

final_sentence: Republican Ira Harris had been elected in 1861.