Appointed by act of Convention:
1689-1698 Thomas Hedge (died Aug. 1698)
Appointed by Secretary in Maryland:
1698-1709 Henry Wriothesly (died June 1709)
1709-1716 John Stokes (resigned)
1716-1718 George Middleton
1718-1732 John Stokes (died Aug. 1732)
1732-1741 Humphrey Wells Stokes (resigned)
1741-1746 Thomas Brerewood, Sr. (died Dec. 22, 1746)
1747-1753 Talbot Risteau (died Nov. 23, 1753)
1753-1768 John Beale Bordley (resigned)
1769-1777 Alexander Lawson, Jr.
Appointed by County Court Justices (Constitution of 1776, sec. 47):
1777-1832 William Gibson
1832-1839 Arad Israel
1839-1844 Thomas Keil
1844-1851 Augustus Williamson Bradford
Elected by Voters to 6-year terms (Constitution of 1864, Art. IV, sec. 29):
1865-1867 John H. Longnecker
Elected by Voters to 6-year terms (Constitution of 1867, Art. IV, sec. 25):
1867-1873 Edward H. Ady
1873-1879 John Bacon (D)
1879-1885 William M. Isaac
1885-1891 John W. Shanklin
1891-1897 Lewis N. Bacon
1897-1903 Nicholas Bosley Merryman
1903-1926 William Purrington Cole
Elected by Voters to 4-year terms (Constitution of 1867, Art. XVII, added by Chapter 227, Acts of 1922, ratified Nov. 7, 1922):
1926-1927 William Purrington Cole
1927 C. Walter Cole
1927-1929 W. Howard Milling
1929-1933 Louis McL. Merryman
1933-1941 C. Willing Browne, Jr. (D)
1941-1942 Christian H. Kahl (D)
1942-1946 Robert J. Spittel (D)
1946-1950 T. Braden Silcott
1950-1958 George L. Byerly
Elected by Voters to 4-year terms (Constitution of 1867, Art. IV, sec. 25, amended by Chapter 99, Acts of 1956, ratified Nov. 6, 1956):
1958-1962 Walter J. Rasmussen (D)
1963-1965 Robert R. Gill (resigned Aug. 6, 1965)
1965-1976 Orville T. Gosnell
1974-1986 Elmer H. Kahline, Jr. (D)
1986-2010 Suzanne K. Mensh (D) (1929-2012)
2010 Richard D. Arnold, Jr. (D)
2010- Julie L. Ensor (D)
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