2018 Orange County Board of Supervisors election

U.S. Senate
U.S. Senate
	1849; 1850; 1852 sp; 1856; 1857 sp; 1860; 1860 sp; 1868; 1872; 1873; 1873 sp; 1878; 1880; 1885; 1886 sp; 1887; 1891; 1891 sp; 1893; 1895 sp; 1897; 1900 sp; 1903; 1905; 1909; 1911; 1914; 1916; 1920; 1922; 1926; 1928; 1932; 1934; 1938; 1940; 1944; 1946; 1946 sp; 1950; 1952; 1954 sp; 1956; 1958; 1962; 1964; 1968; 1970; 1974; 1976; 1980; 1982; 1986; 1988; 1992; 1992 sp; 1994; 1998; 2000; 2004; 2006; 2010; 2012; 2016; 2018; 2022; 2022 sp; 2024; 2024 sp; 2028; 2030;

U.S. President
U.S. President
	1852; 1856; 1860; 1864; 1868; 1872; 1876; 1880; 1884; 1888; 1892; 1896; 1900; 1904; 1908; 1912; 1916; 1920; 1924; 1928; 1932; 1936; 1940; 1944; 1948; 1952; 1956; 1960; 1964; 1968; 1972; 1976; 1980; 1984; 1988; 1992; 1996 Dem; Rep; ; 2000 Dem; Rep; ; 2004 Dem; Rep; ; 2008 Dem; Rep; ; 2012 Dem; Rep; ; 2016 Dem; Rep; ; 2020 Dem; Rep; ; 2024 Dem; Rep; ;

Orange County Board of Supervisors elections, 2018
	June 5 and November 6, 2018
3 of 5 seats to the Orange County Board of Supervisors
Republican 60–70% 100% Winners Republican hold Democratic gain No election	Democratic 50–60%

The 2018 Orange County Board of Supervisors elections took place on June 5, 2018, as part of the primary election on June 5, 2018. Three of the five seats of the Orange County, California Board of Supervisors were up for election.

County elections in California are officially nonpartisan. A two-round system was used for the election, starting with the first round in June, followed by a runoff in November between the top two candidates in each district. Runoffs are only held if no candidate receives a majority in each district.