2018 Orange County Board of Supervisors election

The 2018 Orange County Board of Supervisors elections was 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 will be 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.

Summary of results

 * Note: All elections for the Orange County Board of Supervisors are officially nonpartisan. The parties below identify which party label each candidate would have run under if given the option. Candidates all appear on the ballot as nonpartisan.

Summary of results by county supervisorial district

 * For districts not displayed, there is no election until 2020.

Close races
Seats where the margin of victory was under 5%:


 * 1) County Supervisorial district 4, 0.8%

District 2
District 2 consists of coastal Orange County, including Huntington Beach, Costa Mesa, Cypress, La Palma, Los Alamitos, Newport Beach, Seal Beach, most of Fountain Valley, and neighborhoods in southern Buena Park.

Candidates

 * Michelle Steel (Republican)
 * Brendon Perkins (Democratic)
 * Michael Mahony (Libertarian)

Results
[[File:2018OCsup02.svg|thumb|200px|2018 Orange County's 2nd supervisorial district general election results by congressional district Map legend

{{legend|#dc0000|Steel—60–70%}} ]]

District 4
District 4 consists of inland northwestern Orange County, taking in Fullerton, La Habra, Placentia, Brea, western Anaheim, and most of Buena Park. Incumbent Shawn Nelson retired to run for California's 39th congressional district.

Candidates

 * Doug Chaffee (Democratic)
 * Tim Shaw (Republican)
 * Joe Kerr (Democratic)
 * Lucille Kring (Republican)
 * Rose Espinoza (Democratic)
 * Cynthia Aguirre (Democratic)

Results
[[File:2018OCsup04.svg|thumb|225px|2018 Orange County's 4th supervisorial district general election initial round results by congressional district Map legend

{{legend|#ff2a2a|Shaw—50–60%}}

{{legend|#aaccff|Chaffee—<30%}}

{{legend|#aaffaa|Kring—<30%}} ]]

Results
[[File:2018OCsup04runoff.svg|thumb|225px|2018 Orange County's 4th supervisorial district general election runoff results by congressional district Map legend

{{legend|#0084c8|Chaffee—60–70%}}

{{legend|#19aeff|Chaffee—50–60%}}

{{legend|#ff4141|Shaw—50–60%}} ]]

District 5
District 5 encompasses southern Orange County, including Aliso Viejo, Laguna Hills, Laguna Niguel, Laguna Woods, Lake Forest, Mission Viejo, Rancho Santa Margarita, San Juan Capistrano, Laguna Beach, San Clemente, and Dana Point.

Results
[[File:2018OCsup05.svg|thumb|200px|2018 Orange County's 5th supervisorial district general election results by congressional district Map legend

{{legend|#280b0b|Bartlett—100%}} ]]