state under Union control. The seats had been vacant since the end of the 36th Congress. |- ! | colspan=3 |Vacant | | Seat expired at end of 36th Congress with the withdrawn of Louisiana from the Union.New member elected.Unionist gain. | |- ! | colspan=3 | Vacant | | Seat expired at end of 36th Congress with the withdrawn of Louisiana from the Union.New member elected.Unionist gain. | |} Maine Maine elected its members September 8, 1862. Maryland Maryland elected its members November 3, 1863, after the term began but before the Congress convened. Massachusetts Massachusetts elected its members November 1, 1862. |- ! | Thomas D. Eliot | | Republican | 1858 | Incumbent re-elected. | nowrap | |- ! | James Buffington | | Republican | 1854 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Alexander H. RiceRedistricted from the . | | Republican | 1858 | Incumbent re-elected. | nowrap | |- ! | Samuel HooperRedistricted from the . | | Republican | 1861 (special) | Incumbent re-elected. | nowrap | |- ! | John B. AlleyRedistricted from the . | | Republican | 1858 | Incumbent re-elected. | nowrap | |- ! | Daniel W. GoochRedistricted from the . | | Republican | 1858 | Incumbent re-elected. | nowrap | |- ! rowspan=2 | | Benjamin F. ThomasRedistricted from the . | | People's | 1861 (special) | |Incumbent lost re-election.New member elected.Republican gain. | rowspan=2 nowrap | |- | Charles R. TrainRedistricted from the . | | Republican | 1858 | | Incumbent retired.New member elected.Republican loss. |- ! | colspan=3 | Vacant (new seat) | | New seat.New member elected.Republican gain. | nowrap | |- ! rowspan=2 | | colspan=3 | Vacant | | Rep. Goldsmith Bailey died May 8, 1862.New member elected.Republican gain. | rowspan=2 nowrap | |- | Charles DelanoRedistricted from the . | | Republican | 1858 | | Incumbent retired.New member elected.Republican loss. |- ! | Henry Laurens DawesRedistricted from the . | | Republican | 1856 | Incumbent re-elected. | nowrap | |} Michigan Michigan elected its members November 4, 1862. |- ! | Fernando C. Beaman | | 1860 | Incumbent re-elected. | nowrap | |- ! | colspan=3 | None | | New seat.New member elected.Republican gain. | nowrap | |- ! | Bradley F. Granger | | 1860 | |