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San Benito County was formed in 1874 with only 3 Supervisor districts. On June 6, 1884, the county was re-districted into 5 Supervisor districts per an act of the Legislature passed March 14, 1883.
Supervisors - District 4
| Robert Tiffany | Elected November 3, 2020 |  |
| Jim Gillio | Elected November 6, 2018 (resigned July 31, 2020) |  |
| Jerry Muenzer | Elected November 4, 2014 Elected June 8, 2010 |  |
| Reb Monaco | Elected June 6, 2006 Elected March 5, 2002 |  |
| Ron Rodrigues | Elected June 2, 1998 Elected June 7, 1994 | |
| Curtis Graves | Elected June 5, 1990 Elected June 3, 1986 | |
| Rocky Lydon | Elected November 2, 1982 | |
| George F. Kincaid | Elected November 7, 1978 Elected June 4, 1974 Elected June 2, 1970 Elected June 7, 1966 Elected November 6, 1962 Elected November 4, 1958 - - Took office May 25, 1959 | |
| Henry C. Berg | Elected June 1, 1954 Elected June 6, 1950 Elected June 44, 1946 Elected August 25, 1942 Appointed September 30, 1941 | |
| John Etcheverry | Elected August 30, 1938 - - Resigned Elected August 28, 1934 Elected August 26, 1930 Elected November 2, 1926 Elected November 7, 1922 Elected November 5, 1918 Elected November 3, 1914 Elected November 8, 1910 | |
| A. H. Fredson | Elected November 6, 1906 Elected November 3, 1902 Elected November 8, 1898 | |
| E.J. Sparling | Elected in run-off versus G. W. Lawson, November 30, 1894 | |
| A. J. Chaney | Elected November 4, 1890 | |
| A. H. Fredson | Elected November 2, 1886 | |
| Sampson Duncan | Appointed December 7, 1885 | |
| E. F. Larios | Elected November 4, 1884 - - Resigned November 2, 1885 |
