| District: | 18 |
| Chamber: | Senate |
| Population: | 928,725[1] |
| Population Year: | 2010 |
| Voting Age: | 699,815 |
| Citizen Voting Age: | 471,813 |
| Percent White: | 29.05 |
| Percent Black: | 4.23 |
| Percent Latino: | 56.53 |
| Percent Asian: | 8.93 |
| Percent Native American: | 0.32 |
| Percent Pacific Islander: | 0.15 |
| Percent Other Race: | 0.35 |
| Percent Remainder Of Multiracial: | 0.44 |
| Registered: | 503,382[2] |
| Democratic: | 53.43 |
| Republican: | 13.75 |
| Npp: | 27.24 |
California's 18th senatorial district is one of 40 California State Senate districts. It is currently represented by Democrat Steve Padilla of Chula Vista.
The district stretches along the Mexico–United States border and predominantly includes rural Imperial Valley and areas of California along the Colorado River, including Needles, Blythe, and Indio. However, most of the district's population is in southern San Diego County, including Imperial Beach, Otay Mesa, Chula Vista, National City, Lincoln Acres, Bonita, the Tijuana River Valley, and the southeastern side of San Diego.
| Year | Office | Results |
|---|---|---|
| 2021 | Recall | align="right" No 75.2 – 24.8% |
| 2020 | President | Biden 73.7 – 24.3% |
| 2018 | Governor | Newsom 76.5 – 23.5% |
| Senator | Feinstein 57.9 – 42.1% | |
| 2016 | President | Clinton 75.9 – 18.8% |
| Senator | Harris 59.5 – 40.5% | |
| 2014 | Governor | Brown 71.6 – 28.4% |
| 2012 | President | Obama 73.9 – 23.5% |
| Senator | Feinstein 75.3 – 24.7% |
Due to redistricting, the 18th district has been moved around different parts of the state. The current iteration resulted from the 2011 redistricting by the California Citizens Redistricting Commission.
| Senators | Party | Years served | Counties represented | Notes | |
|---|---|---|---|---|---|
| Frederick Cox | Democratic | January 8, 1883 - January 3, 1887 | Sacramento | Served together with Routier.[3] | |
| Joseph Routier | Republican | January 8, 1883 - January 3, 1887 | |||
| M. W. Dixon | Democratic | January 3, 1887 - January 5, 1891 | Alameda | ||
| William Simpson | Republican | January 5, 1891 - January 7, 1895 | |||
| Hugh Toner | Democratic | January 7, 1895 - January 2, 1899 | San Francisco | ||
| John A. Hoey | Republican | January 2, 1899 - January 5, 1903 | |||
| Harry Bunkers | Democratic | January 5, 1903 - February 27, 1905 | Expelled from the Senate for bribery.[4] | ||
| Daniel J. Reily | Republican | January 7, 1907 - January 2, 1911 | |||
| Daniel P. Regan | January 2, 1911 - January 4, 1915 | ||||
| Dominic Joseph Beban | Progressive | January 4, 1915 - February 29, 1916 | Died in office.[5] | ||
| Victor J. Canepa | Independent | January 8, 1917 - January 5, 1931 | Change his party to Republican when he ran for his 2nd term. | ||
| Republican | |||||
| Herbert C. Jones | January 5, 1931 - January 7, 1935 | Santa Clara | |||
| Sanborn Young | January 7, 1935 - January 2, 1939 | ||||
| John D. Foley | Democratic | January 2, 1939 - January 4, 1943 | |||
| Byrl R. Salsman | Republican | January 4, 1943 - October 1, 1949 | Resigned from the Senate to become a Judge. | ||
| John F. "Jack" Thompson | January 8, 1951 - January 7, 1963 | ||||
| Clark L. Bradley | January 7, 1963 - January 2, 1967 | ||||
| Walter W. Stiern | Democratic | January 2, 1967 - November 30, 1974 | Kern, Kings | ||
| Omer Rains | December 2, 1974 - November 30, 1982 | Santa Barbara, Ventura | |||
| Gary K. Hart | December 6, 1982 - November 30, 1994 | Los Angeles, Santa Barbara, Ventura | |||
| Jack O'Connell | December 5, 1994 – November 30, 2002 | San Luis Obispo, Santa Barbara, Ventura | |||
| Roy Ashburn | Republican | December 2, 2002 – November 30, 2010 | Inyo, Kern, San Bernardino, Tulare | ||
| Jean Fuller | December 6, 2010 - November 30, 2014 | ||||
| Robert Hertzberg | Democratic | December 1, 2014 – December 5, 2022 | Los Angeles | ||
| Steve Padilla | Democratic | December 5, 2022 – present | Imperial, Riverside, San Bernardino, San Diego | ||