| | Unionist | 1865 | |Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | William B. Campbell | | Unionist | 1865 | |Incumbent retired.New member elected.Republican gain. | nowrap | |- ! | Samuel M. Arnell | | Unionist | 1865 | |Incumbent re-elected.Republican gain. | |- ! | Isaac R. Hawkins | | Unionist | 1865 | |Incumbent re-elected.Republican gain. | nowrap | |- ! | John W. Leftwich | | Unionist | 1865 | |Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Utah Territory See non-voting delegates, below. Vermont Washington Territory See non-voting delegates, below. West Virginia |- ! | Chester D. Hubbard | | Unconditional Unionist | 1864 | | Incumbent re-elected.Republican gain. | nowrap | |- ! | George R. Latham | | Unconditional Unionist | 1864 | | Incumbent retired.New member elected.Republican gain. | nowrap | |- ! | Kellian Whaley | | Unconditional Unionist | 1863 | | Incumbent retired.New member elected.Republican gain. | nowrap | |} Wisconsin Wisconsin elected six members of congress on Election Day, November 4, 1866. |- ! | Halbert E. Paine | | National Union | 1864 | | Incumbent won re-election as a Republican.Republican hold. | nowrap | |- ! | Ithamar Sloan | | National Union | 1862 | | Incumbent was not a candidate for re-election.New member elected.Republican hold. | nowrap | |- ! | Amasa Cobb | | National Union | 1862 | | Incumbent won re-election as a Republican.Republican hold. | nowrap | |- ! | Charles A. Eldredge | | Democratic | 1862 | Incumbent re-elected. | nowrap | |- ! | Philetus Sawyer | | National Union | 1864 | | Incumbent won re-election as a Republican.Republican hold. | nowrap | |- ! | Walter D. McIndoe | | National Union | 1862 | | Incumbent was not a candidate for re-election.New member elected.Republican hold. | nowrap | |} Non-voting delegates |- ! |- ! |- ! | Edward D. Holbrook | | Democratic | 1864 | Incumbent re-elected. | nowrap | |- ! | Samuel McLean | | Democratic | 1864 | | Incumbent retired.New delegate elected.Democratic hold. | nowrap | |- ! |- ! |- ! |} See also 1866 United States elections 1866–67 United States Senate elections 39th United States Congress 40th United States Congress Notes References Bibliography , large collection of