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1866–67 United States Senate elections

Dates vary by state (and other dates for special elections)
25 of the 66 (6 vacant)/72 seats in the United States Senate (with special elections) 34 seats needed for a majority
Majority party Minority party   Leader Henry B. Anthony Party Republican Democratic Leader since March 4, 1863 Leader's seat Rhode Island Last election 33 seats 9 seats Seats before 37 10 Seats won 17 2 Seats after 41 10 Seat change 4 Seats up 13 2   Third party Fourth party   Party National Union Unconditional Union Last election 2 seats 4 seats Seats before 3 2 Seats won 0 0 Seats after 2 1 Seat change 1 1 Seats up 1 1
Results of the elections:      Democratic gain      Democratic hold      Republican gain      Republican hold      Legislature failed to elect      Unreconstructed states
Majority party before election Republican Elected Majority party Republican