• 1978 - Robert C. Bacon
• 1979 - John J. Franke, Jr.
• 1980 - Clay L. Wirt
• 1981 - Robert C. Bacon
• 1982 - Johnna Lingle
• 1983 - William E. Franklin
• 1984 - Bruce R. Craig
• 1985 - Janet D. Leick
• 1986 - Kent E. Crippin
• 1987 - Johnna Lingle
• 1988 - William E. Franklin
• 1989 - Bruce R. Craig
• 1990 - Murray L. Nolte
• 1991 - Danny Hosfield
• 1992 - Johnna Lingle
• 1993 - Sue E. Weltner
• 1994 - Bruce R. Craig
• 1995 - Annabeth Surbaugh
• 1996 - Elaine Beckers-Braun
• 1997 - Johnna Lingle
• 1998 - David C. Wysong
• 1999 - George R. Gross
• 2000 - Annabeth Surbaugh
• 2001 - Douglas E. Wood
• 2002 - Susie Wolf
• 2003 - Annabeth Surbaugh*
• 2011 - Ed Eilert

* First countywide elected Chairman of the Board under the auspices of the Home Rule Charter.

• 1861 - W. B. Maupin
• 1862 - A. H. Sheeds
• 1864 - D. M. Williams
• 1868 - B. Hollenback
• 1870 - William H. Brady
• 1872 - Thomas Douglass
• 1874 - J. E. Bernard
• 1876 - L. F. Watts
• 1878 - Thomas Douglass
• 1879 - C. Zehring
• 1885 - David Hunt
• 1888 - P. G. Cross
• 1891 - A. N. Edgington
• 1894 - Lewis W. Breyfogle
• 1897 - W. S. Speer
• 1903 - J. E. Young
• 1907 - Robert Baker
• 1911 - A. J. Calvert
• 1915 - J. W. Jones
• 1927 - B. F. Stanton
• 1931 - Louis O. Krumm
• 1947 - H. M. Beckett
• 1949 - Martin J. Ziegler
• 1959 - Carl Standiford
• 1967 - Rex F. Price
• 1975 - William B. Stringer
• 1975 - Clay L. Wirt
• 1981 - Jeffrey P. Hillelson
• 1983 - William E. Franklin
• 1989 - Sue E. Weltner
• 1996 - David C. Wysong
• 1999 - Gary A. Anderson
• 2003 - C. Edward Peterson
• 2015 - Ronald L. "Ron" Shaffer

• 1861 - A. Payne
• 1862 - G. W. Roberts
• 1864 - Evan Shriver
• 1866 - W. C. Smith
• 1868 - John Brady
• 1872 - J. B. Marshall
• 1874 - J. H. Hibbard
• 1878 - T. G. Stephenson
• 1883 - D. P. Hougland
• 1892 - Samuel McPherson
• 1898 - I. H. Segate
• 1901 - S. W. Allison
• 1909 - Harry King, Sr.
• 1913 - W. W. Anderson
• 1917 - George Ellis
• 1921 - Wyatt E. Hayes
• 1929 - J. O. Johnson
• 1937 - J. S. Steed
• 1941 - Ollie Turner
• 1945 - George Russell
• 1957 - Herman F. Higgins
• 1961 - Harry King, Jr.
• 1965 - Kenneth J. Heard
• 1969 - Victor W. Kearns, Jr.
• 1973 - John J. Franke, Jr.
• 1981 - Johnna Lingle
• 2001 - Susie Wolf
• 2005 - John Segale
• 2009 - Jim Allen

• 1861 - Leonard Bradbury
• 1862 - E. Mason
• 1865 - Thomas Hogan
• 1866 - C. L. Dille
• 1868 - John Fulcher
• 1870 - H. W. McClintock
• 1874 - V. R. Ellis
• 1876 - Alex Miller
• 1878 - Thomas Pearce
• 1881 - A. Fritz
• 1887 - R. R. Moore
• 1890 - I. D. Hibner
• 1896 - C. K. Dow
• 1899 - John T. Cramer
• 1905 - John W. Perkins
• 1909 - Joe Hibner
• 1913 - F. M. Gordon
• 1917 - W. T. Turner
• 1921 - C. W. Skinner
• 1925 - Fred Thomas
• 1929 - Frank Moore
• 1935 - Ollie Turner
• 1937 - L. R. Penner
• 1953 - Clyde L. Curry
• 1957 - Harry King, Jr.
• 1961 - Herman F. Higgins
• 1969 - Robert R. Davis
• 1977 - Robert C. Bacon
• 1985 - Kent E. Crippin
• 1990 - Danny L. Hosfield
• 1993 - Annabeth Surbaugh
• 2003 - David A. Lindstrom
• 2013 - Steven C. Klika

• 1983 – Janet D. Leick
• 1986 – Joan Bengtson
• 1987 – Murray L. Nolte
• 1994 – Elaine Beckers-Braun
• 1998 – George R. Gross
• 2003 - Dolores Furtado
• 2007 - Ed Eilert
• 2011 - Jason Osterhaus

• 1983 - Bruce R. Craig
• 1998 - Douglas E. Wood
• 2011 - Michael Ashcraft

• 2003 - John M. Toplikar
• 2009 - Calvin Hayden
• 2013 - John M. Toplikar
• 2017 - Mike Brown