| S.no. | Governor | Term start | Term end | Party | Place |
|---|---|---|---|---|---|
| 1 | William King | 15 March 1820 | 28 May 1821 | Democratic-Republican | Scarborough |
| 2 | William D. Williamson | 28 May 1821 | 5 December 1821 | Democratic-Republican | Canterbury, Connecticut, United States |
| 3 | Benjamin Ames | 5 December 1821 | 2 January 1822 | Democratic-Republican | Andover, Massachusetts |
| 4 | Daniel Rose | 2 January 1822 | 5 January 1822 | Democratic-Republican | Connecticut |
| 5 | Albion K. Parris | 5 January 1822 | 3 January 1827 | Democratic-Republican | Hebron, Maine |
| 6 | Enoch Lincoln | 3 January 1827 | 8 October 1829 | Democratic-Republican | Worcester, Massachusetts |
| 7 | Nathan Cutler | 8 October 1829 | 6 January 1830 | Democratic | Lexington, Massachusetts |
| 8 | Joshua Hall | 6 January 1830 | 9 February 1830 | Democratic | Lewes, Delaware |
| 9 | Jonathan G. Hunton | 9 February 1830 | 5 January 1831 | National Republican | Unity, New Hampshire, USA |
| 10 | Samuel E. Smith | 5 January 1831 | 1 January 1834 | Democratic | Hollis, New Hampshire |
| 11 | Robert P. Dunlap | 1 January 1834 | 3 January 1838 | Democratic | Brunswick, Maine |
| 12 | Edward Kent | 19 January 1838 | 2 January 1839 | Whig | Concord, New Hampshire |
| 13 | John Fairfield | 2 January 1839 | 12 January 1841 | Democratic | Saco, Maine |
| 14 | Richard H. Vose | 12 January 1841 | 13 January 1841 | Whig | Augusta, Maine |
| 15 | Edward Kent | 13 January 1841 | 5 January 1842 | Whig | Concord, New Hampshire |
| 16 | John Fairfield | 5 January 1842 | 7 March 1843 | Democratic | Saco, Maine |
| 17 | Edward Kavanagh | 7 March 1843 | 1 January 1844 | Democratic | Newcastle, Maine |
| 18 | David Dunn | 1 January 1844 | 3 January 1844 | Democratic | Cornish, Maine |
| 19 | John W. Dana | 3 January 1844 | 3 January 1844 | Democratic | Fryeburg, Maine |
| 20 | Hugh J. Anderson | 3 January 1844 | 12 May 1847 | Democratic | Wiscasset, Maine |
| 21 | John W. Dana | 12 May 1847 | 8 May 1850 | Democratic | Fryeburg, Maine |
| 22 | John Hubbard | 8 May 1850 | 5 January 1853 | Democratic | Readfield, Maine |
| 23 | William G. Crosby | 5 January 1853 | 3 January 1855 | Whig | Belfast, Maine |
| 24 | Anson Morrill | 3 January 1855 | 2 January 1856 | Republican | Belgrade, Maine |
| 25 | Samuel Wells | 2 January 1856 | 8 January 1857 | Democratic | Durham, New Hampshire |
| 26 | Hannibal Hamlin | 8 January 1857 | 25 February 1857 | Republican | Paris, Maine |
| 27 | Joseph H. Williams | 25 February 1857 | 6 January 1858 | Republican | Augusta, Maine, USA |
| 28 | Lot M. Morrill | 6 January 1858 | 2 January 1861 | Republican | Belgrade, Maine |
| 29 | Israel Washburn, Jr. | 2 January 1861 | 7 January 1863 | Republican | Livermore, Maine |
| 30 | Abner Coburn | 7 January 1863 | 6 January 1864 | Republican | Skowhegan, Maine |
| 31 | Samuel Cony | 6 January 1864 | 2 January 1867 | Republican | Augusta, Maine |
| 32 | Joshua Chamberlain | 2 January 1867 | 4 January 1871 | Republican | Brewer, Maine, U.S. |
| 33 | Sidney Perham | 4 January 1871 | 7 January 1874 | Republican | Woodstock, Maine |
| 34 | Nelson Dingley, Jr. | 7 January 1874 | 5 January 1876 | Republican | Durham, Maine |
| 35 | Seldon Connor | 5 January 1876 | 8 January 1879 | Republican | Fairfield, Maine |
| 36 | Alonzo Garcelon | 8 January 1879 | 17 January 1880 | Democratic | Lewiston, Maine |
| 37 | Daniel F. Davis | 17 January 1880 | 13 January 1881 | Republican | Freedom, Maine, USA |
| 38 | Harris M. Plaisted | 13 January 1881 | 3 January 1883 | Greenback / Democratic | Jefferson, New Hampshire |
| 39 | Frederick Robie | 3 January 1883 | 5 January 1887 | Republican | Gorham, Maine, USA |
| 40 | Joseph R. Bodwell | 5 January 1887 | 15 December 1887 | Republican | Methuen, Massachusetts |
| 41 | Sebastian Streeter Marble | 15 December 1887 | 2 January 1889 | Republican | Dixfield, Maine, USA |
| 42 | Edwin C. Burleigh | 2 January 1889 | 4 January 1893 | Republican | Linneus, Maine |
| 43 | Henry B. Cleaves | 4 January 1893 | 2 January 1897 | Republican | Bridgton, Maine |
| 44 | Llewellyn Powers | 2 January 1897 | 2 January 1901 | Republican | Pittsfield, Maine |
| 45 | John Fremont Hill | 2 January 1901 | 4 January 1905 | Republican | Eliot, Maine |
| 46 | William T. Cobb | 4 January 1905 | 6 January 1909 | Republican | Rockland, Maine, USA |
| 47 | Bert M. Fernald | 6 January 1909 | 4 January 1911 | Republican | Poland, Maine |
| 48 | Frederick W. Plaisted | 4 January 1911 | 1 January 1913 | Democratic | Bangor, Maine |
| 49 | William T. Haines | 1 January 1913 | 6 January 1915 | Republican | Levant, Maine |
| 50 | Oakley C. Curtis | 6 January 1915 | 3 January 1917 | Democratic | Portland, Maine |
| 51 | Carl E. Milliken | 3 January 1917 | 5 January 1921 | Republican | Pittsfield, Maine |
| 52 | Frederic Hale Parkhurst | 5 January 1921 | 31 January 1921 | Republican | Bangor, Maine |
| 53 | Percival Proctor Baxter | 31 January 1921 | 7 January 1925 | Republican | Portland, Maine |
| 54 | Owen Brewster | 7 January 1925 | 2 January 1929 | Republican | Dexter, Maine |
| 55 | William Tudor Gardiner | 2 January 1929 | 4 January 1933 | Republican | Newton, Massachusetts, U.S. |
| 56 | Louis J. Brann | 4 January 1933 | 6 January 1937 | Democratic | Madison, Maine |
| 57 | Lewis O. Barrows | 6 January 1937 | 1 January 1941 | Republican | Newport, Maine |
| 58 | Sumner Sewall | 1 January 1941 | 3 January 1945 | Republican | |
| 59 | Horace A. Hildreth | 3 January 1945 | 5 January 1949 | Republican | Gardiner, Maine, U.S. |
| 60 | Frederick G. Payne | 5 January 1949 | 24 December 1952 | Republican | Lewiston, Maine |
| 61 | Burton M. Cross | 24 December 1952 | 6 January 1953 | Republican | Gardiner, Maine, U.S. |
| 62 | Nathaniel M. Haskell | 6 January 1953 | 7 January 1953 | Republican | Pittsfield, Maine |
| 63 | Burton M. Cross | 7 January 1953 | 5 January 1955 | Republican | Gardiner, Maine, U.S. |
| 64 | Edmund Muskie | 5 January 1955 | 2 January 1959 | Democratic | Rumford, Maine, United States |
| 65 | Robert Haskell | 2 January 1959 | 7 January 1959 | Republican | Bangor, Maine |
| 66 | Clinton Clauson | 7 January 1959 | 30 December 1959 | Democratic | Mitchell, Iowa |
| 67 | John H. Reed | 30 December 1959 | 5 January 1967 | Republican | Fort Fairfield, Maine, U.S. |
| 68 | Kenneth M. Curtis | 5 January 1967 | 2 January 1975 | Democratic | Leeds, Maine |
| 69 | James B. Longley | 2 January 1975 | 3 January 1979 | Independent | Bangor, Maine, United States |
| 70 | Joseph E. Brennan | 3 January 1979 | 7 January 1987 | Democratic | Portland, Maine |
| 71 | John R. McKernan, Jr. | 7 January 1987 | 5 January 1995 | Republican | Bangor, Maine |
| 72 | Angus King | 5 January 1995 | 8 January 2003 | Independent | Alexandria, Virginia, U.S. |
| 73 | John Baldacci | 8 January 2003 | 5 January 2011 | Democratic | Bangor, Maine, U.S. |
| 74 | Paul LePage | 5 January 2011 | 2 January 2019 | Republican | Lewiston, Maine, U.S. |
| 75 | Janet Mills | 2 January 2019 | Incumbent | Democratic | Farmington, Maine, United States |
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| US States Governors List |