Louisiana-Missouri Territory: Territorial Governors: 1805-1820 - Archontology
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Louisiana-Missouri Territory: Territorial Governors: 1805-1820

Governor of the Territory of Louisiana [1]
4 Jul 1805 - 3 Mar 1807 James Wilkinson [2]
Secretary, exercising the Government, and the office of Commander-in-Chief of the Territory of Louisiana [3]
3 Mar 1807 - 7 Apr 1807 Joseph Browne [4]
7 Apr 1807 - 8 Mar 1808 Frederick Bates [5]
Governor of the Territory of Louisiana
8 Mar 1808 - 11 Oct 1809 Meriwether Lewis [6]
Secretary, exercising the Government, and the office of Commander-in-Chief of the Territory of Louisiana [3]
11 Oct 1809 - 17 Sep 1810 Frederick Bates  [7]
Governor of the Territory of Louisiana and Commander-in-Chief of the Militia thereof
17 Sep 1810 - 6 Dec 1812 Benjamin Howard [8]
Governor of the Territory of Missouri and Commander-in-Chief of the Militia thereof
7 Dec 1812 - 18 Apr 1813 Benjamin Howard 
Secretary of the Territory of Missouri, and exercising the Government
18 Apr 1813 - 1 Jul 1813 Frederick Bates 
Governor of the Territory of Missouri, and Commander-in-Chief of the Militia thereof
1 Jul 1813 - 17 Sep 1820 William Clark [9]

[1] The commissions issued for the appointment of Wilkinson in 1805 and 1806 referred to the office as Governor in and over the Territory of Louisiana. Also in official use: Governor and Superintendent of Indian affairs in and over the Territory of Louisiana, Governor and Commander-in-Chief in and over the Territory of Louisiana.
[2] Wilkinson was appointed Governor effective 3 Jul 1805 and took the oath of office on 27 Jun 1805, but the Territory of Louisiana was constituted on 4 Jul 1805. He left the Territory, departing from St. Louis on 16 Aug 1806, but continued in office to the date of commencement of the term of his successor (3 Mar 1807) and was, accordingly, paid up to 2 Mar 1807 (Territorial Papers, 14:3-5).
[3] Also in official use: Secretary of the Territory of Louisiana, and exercising the Government thereof.
[4] Acting for the absent incumbents: 16 Aug 1806 - 7 Apr 1807.
[5] Pending the taking office of Meriwether Lewis.
[6] Lewis was appointed Governor for the term ending on 3 Mar 1810 and took office on 8 Mar 1808. He departed for Washington, D.C., on 4 Sep 1809 and died during his travel on 11 Oct 1809.
[7] Acting for the absent incumbent: 4 Sep 1809 - 11 Oct 1809.
[8] Howard was appointed Governor for the term ending on 18 Apr 1813 and arrived to St. Louis on 17 Sep 1810.
[9] Clark was appointed Governor, arrived to St. Louis on 1 Jul 1813 and took the oath of office on 6 Jul 1813.