| | Republican | 1862 | Incumbent re-elected. | nowrap | |- ! | Rufus P. Spalding | | Republican | 1862 | Incumbent re-elected. | nowrap | |- ! | James A. Garfield | | Republican | 1862 | Incumbent re-elected. | nowrap | |} Oregon Pennsylvania Rhode Island South Carolina Tennessee Elections held late, on August 3, 1865. |- ! | rowspan=8 colspan=3 align="center" | None (vacant due to Civil War) | rowspan=8 align="center" |New members elected.Unionist gain. | nowrap | |- ! | nowrap | |- ! | nowrap | |- ! | nowrap | |- ! | nowrap | |- ! | |- ! | nowrap | |- ! | nowrap | |} Texas Utah Territory See non-voting delegates, below. Vermont Virginia Washington Territory See non-voting delegates, below. West Virginia |- ! | Jacob B. Blair | | Unconditional Unionist | 1863 | | Incumbent retired.New member elected.Unconditional Unionist hold. | nowrap | |- ! | William G. Brown Sr. | | Unconditional Unionist | 1863 | | Incumbent retired.New member elected.Unconditional Unionist hold. | nowrap | |- ! | Kellian Whaley | | Unconditional Unionist | 1863 | Incumbent re-elected. | nowrap | |} Wisconsin Wisconsin elected six members of congress on Election Day, November 8, 1864. |- ! | James S. Brown | | Democratic | 1862 | | Incumbent withdrew from election.New member elected.National Union gain. | nowrap | |- ! | Ithamar Sloan | | Republican | 1862 | | Incumbent won re-election on National Union ticket.Republican hold. | nowrap | |- ! | Amasa Cobb | | Republican | 1862 | | Incumbent won re-election on National Union ticket.Republican hold. | nowrap | |- ! | Charles A. Eldredge | | Democratic | 1862 | Incumbent re-elected. | nowrap | |- ! | Ezra Wheeler | | Democratic | 1862 | | Incumbent retired.New member elected.National Union gain. | nowrap | |- ! | Walter D. McIndoe | | Republican | 1862 Special | | Incumbent won re-election on National Union ticket.Republican hold. | nowrap | |} Non-voting delegates 38th Congress |- ! | colspan=3 | New district | | New seat.New delegate elected on an unknown date in 1864.Republican gain. | nowrap | |- ! | colspan=3 | New district | | New seat.New delegate elected.Democratic gain. | nowrap | |} 39th Congress |- ! | Charles Debrille Poston |