Idaho Territory was established 4 Mar 1863. The following is a list of the governors of Idaho Territory, which, for a time, included parts of present-day Montana and Wyoming. Since it is a long distance between Washington DC and Idaho, there were gaps between when a governor was appointed and when he took office. Several were appointed, but never took office.
| Governor | Took Office | Left Office | Appointed By |
| William H Wallace | Jul 1863 | Dec 1863 | Abraham Lincoln |
| Caleb Lyon | 1 Aug 1864 | Apr 1866 | Abraham Lincoln |
| David W Ballard | 14 Jun 1866 | Jul 1870 | Andrew Johnson |
| Samuel Bard | Appointed 30 Mar 1870 | Never took office | Ulysses S Grant |
| Gilman Marston | Appointed 7 Jun 1870 | Never took office | Ulysses S Grant |
| Alexander H Conner | Appointed 12 Jan 1871 | Never took office | Ulysses S Grant |
| Thomas M Bowen | Jul 1871 | 15 Aug 1871 | Ulysses S Grant |
| Thomas W Bennett | Dec 1871 | 4 Dec 1875 | Ulysses S Grant |
| David P Thompson | Apr 1876 | May 1876 | Ulysses S Grant |
| Mason Brayman | Jul 1876 | 24 Jul 1880 | Ulysses S Grant |
| John P Hoyt | Appointed 8 Jun 1878 | Didn't respond | Rutherford B Hayes |
| John P Hoyt | Appointed 7 Aug 1878 | Refused Appointment | Rutherford B Hayes |
| John Baldwin Neil | 3 Aug 1880 | 2 Mar 1883 | Rutherford B Hayes |
| John N Irwin | Apr 1883 | 20 Dec 1883 | Chester A Arthur |
| William M Bunn | 26 Jun 1884 | 3 Jul 1885 | Chester A Arthur |
| Edward A Stevenson | 29 Sep 1885 | 1 Apr 1889 | Grover Cleveland |
| George Laird Shoup | 30 Apr 1889 | 3 Jul 1890 | Benjamin Harrison |
Idaho was admitted to the Union 3 Jul 1890. The terms for Governor and Lieutenant Governor are four years, starting on the first Monday in January following the election. Before 1946, the term was two years. If the Governor cannot fulfill his duties, the Lieuteneant Governor acts in his place. If both the Governor and Lieutenant Governor cannot fulfill the duties, then the President pro tempore of the Idaho Senate is next in line. The Speaker of the Idaho House of Representatives is next.
| Governor | Took Office | Left Office | Lt Governor |
| George Laird Shoup | 01 Oct 1890 | 18 Dec 1890 | N B Willey |
| N B Willey | 18 Dec 1890 | 02 Jan 1893 | John S Gray |
| William J McConnell | 02 Jan 1893 | 04 Jan 1897 | F B Willis |
| | | | F J Mills |
| Frank Steunenberg | 04 Jan 1897 | 07 Jan 1901 | George F Moore |
| | | | J H Hutchinson |
| Frank W Hunt | 07 Jan 1901 | 05 Jan 1903 | Thomas F Terrell |
| John T Morrison | 05 Jan 1903 | 02 Jan 1905 | James M Stevens |
| Frank R Gooding | 02 Jan 1905 | 04 Jan 1909 | Burpee L Steeves |
| | | | Ezra A Burrell |
| James H Brady | 04 Jan 1909 | 02 Jan 1911 | Lewis H Sweetser |
| James H Hawley | 02 Jan 1911 | 06 Jan 1913 | Lewis H Sweetser |
| John M Haines | 06 Jan 1913 | 04 Jan 1915 | Herman H Taylor |
| Moses Alexander | 04 Jan 1915 | 06 Jan 1919 | Herman H Taylor |
| | | | Ernest L Parker |
| D W Davis | 06 Jan 1919 | 01 Jan 1923 | Charles C Moore |
| Charles C Moore | 01 Jan 1923 | 03 Jan 1927 | H C Baldridge |
| H C Baldridge | 03 Jan 1927 | 05 Jan 1931 | O E Hailey |
| | | | W B Kinne |
| | | | O E Hailey |
| C Ben Ross | 05 Jan 1931 | 04 Jan 1937 | G P Mix |
| | | | George E Hill |
| | | | G P Mix |
| Barzilla W Clark | 04 Jan 1937 | 02 Jan 1939 | Charles C Gossett |
| C A Bottolfsen | 02 Jan 1939 | 06 Jan 1941 | Donald S Whitehead |
| Chase A Clark | 06 Jan 1941 | 04 Jan 1943 | Charles C Gossett |
| C A Bottolfsen | 04 Jan 1943 | 01 Jan 1945 | Edwin Nelson |
| Charles C Gossett | 01 Jan 1945 | 17 Nov 1945 | Arnold Williams |
| Arnold Williams | 17 Nov 1945 | 06 Jan 1947 | A R McCabe |
| C A Robins | 06 Jan 1947 | 01 Jan 1951 | Donald S Whitehead |
| Leonard B Jordan | 01 Jan 1951 | 03 Jan 1955 | Edson H Deal |
| Robert E Smylie | 03 Jan 1955 | 02 Jan 1967 | J Berkeley Larsen |
| | | | W E Drevlow |
| Don Samuelson | 02 Jan 1967 | 04 Jan 1971 | Jack M Murphy |
| Cecil D Andrus | 04 Jan 1971 | 24 Jan 1977 | Jack M Murphy |
| | | | John V Evans |
| John V Evans | 24 Jan 1977 | 05 Jan 1987 | William J Murphy |
| | | | Phil Batt |
| | | | David H Leroy |
| Cecil D Andrus | 05 Jan 1987 | 02 Jan 1995 | C L "Butch" Otter |
| Phil Batt | 02 Jan 1995 | 04 Jan 1999 | C L "Butch" Otter |
| Dirk Kempthorne | 04 Jan 1999 | 26 May 2006 | C L "Butch" Otter |
| | | | Jack Riggs |
| | | | Jim Risch |
| Jim Risch | 26 May 2006 | 01 Jan 2007 | Mark Ricks |
| C L "Butch" Otter | 01 Jan 2007 | | Jim Risch |
| | | | Brad Little |
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2010 Compilation Copyright - Trails to the Past & Jeanne Hicks. For personal use only. Not for commercial use without the express permission of the copyright holder.
