| February 22, 1889 25 Stat. 676 |
September 14, 1922 42 Stat. 837 |
July 10, 1984 98 Stat. 333 |
| Knowles, Hiram 1890-1904 |
Pray, Charles N. 1924-1957 |
Lovell, Charles C. 1985-2000 |
| Hunt, William H. 1904-1910 |
Jameson, William J. 1957-1969 |
Haddon, Sam E. 2001-2012 |
| Rasch, Carl L. 1910-1911 |
Battin, James F. 1969-1990 |
Morris, Brian M. 2013- |
| Bourquin, George M. 1912-1934 |
Shanstrom, Jack D. 1990-2001 |
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| Baldwin, James H. 1935-1944 |
Cebull, Richard F. 2001-2013 |
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| Brown, Robert L., Sr. 1945-1948 |
Watters, Susan P. 2013- |
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| Murray, William D. 1949-1965 |
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| Smith, Russell E. 1966-1979 |
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| Hatfield, Paul G. 1979-1996 |
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| Molloy, Donald W. 1996-2011 |
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| Christensen, Dana L. 2011- |