| 1885 - 1889 | James P. Guilliland | |
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1890 - 1894 | Willis C. Hoover |
| 1895 - 1903 | C.S. Winan | |
| 1904 | Mr. R. Watson | |
| 1905 | W.T. Robinson | |
| 1906 - 1911 | James Herman | |
| 1912 | Roberto Elphick | |
| 1913 - 1915 | Mr. Allen | |
| 1916 - 1928 | W.C. Pflaum | |
| 1929 | W.A. Shelly | |
| 1930 | Legrand Smith | |
| 1931 | Roberto Elphick | |
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1932 - 1945 | Achsah Skinner |
| 1946 - 1947 | Domingo Vega | |
| 1948 | Rolando Zapata - Carlos Standen | |
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1949 - 1950 | Wallace Arms |
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1951 - 1952 | Paul Arms |
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1953 - 1955 | Edward Barber |
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1956 - 1959 | Paul Arms |
| 1960 - 1962 | Mario Vergara | |
| 1963 - 1964 | Roberto Johansson | |
| 1965 - 1968 | Joseph G. Williams | |
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1969 - 1972 | Esther Stevens Noel |
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1973 - 1986 | Víctor Brizuela Aguirre |
| 1986 - 1987 | Caupolicán Vargas | |
| 1988 - 1997 | Osvaldo Acevedo Medina | |
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1998 - 2011 | Nelly Marchant Bravo |
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2012 - 2013 | Thelma Varas Muñoz |
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2014 - a la fecha | Enrique Quintana Maldonado |