| District: | 18 |
| Chamber: | Assembly |
| Population: | 469,665[1] |
| Population Year: | 2010 |
| Voting Age: | 365,624 |
| Citizen Voting Age: | 281,791 |
| Percent White: | 23.96 |
| Percent Black: | 23.32 |
| Percent Latino: | 26.30 |
| Percent Asian: | 23.50 |
| Percent Native American: | 0.56 |
| Percent Pacific Islander: | 0.70 |
| Percent Other Race: | 0.33 |
| Percent Remainder Of Multiracial: | 1.33 |
| Registered: | 270,094 |
| Democratic: | 64.05 |
| Republican: | 6.82 |
| Npp: | 24.79 |
California's 18th State Assembly district is one of 80 California State Assembly districts. It is currently represented by Democrat Mia Bonta of Alameda after winning the special election.
The district encompasses the central East Bay, centered on the city of Oakland.
Alameda County – 31.1%
| Year | Office | Results |
|---|---|---|
| 2021 | Recall | align="right" No 88.9 – 11.1% |
| 2020 | President[2] | Biden 86.5 – 11.3% |
| 2018 | Governor | Newsom 88.3 – 11.7% |
| Senator | Feinstein 58.9 – 41.1% | |
| 2016 | President | Clinton 85.9 – 8.4% |
| Senator | Harris 78.7 – 21.3% | |
| 2014 | Governor | Brown 89.6 – 10.4% |
| 2012 | President | Obama 86.9 – 10.2% |
| Senator | Feinstein 89.5 – 10.5% |
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.
| Assembly members | Party | Years served | Counties represented | Notes |
|---|---|---|---|---|
| Winfield J. Davis | Republican | January 5, 1885 - January 3, 1887 | Sacramento | |
| Harry W. Carroll | January 3, 1887 - January 7, 1889 | |||
| William M. Petrie | January 7, 1889 - January 5, 1891 | |||
| Judson C. Brusie | January 5, 1891 - January 2, 1893 | |||
| Owen Wade | January 2, 1893 - January 4, 1897 | Napa | ||
| Frank Coombs | January 4, 1897 - January 2, 1899 | |||
| Owen Wade | January 2, 1899 - January 1, 1901 | |||
| Edward L. Webber | January 1, 1901 - January 5, 1903 | |||
| John M. Higgins | January 5, 1903 - January 2, 1905 | Sacramento | ||
| Frank J. O'Brien | January 2, 1905 - January 4, 1909 | |||
| Eldridge Lafayette Hawk | January 4, 1909 - January 2, 1911 | |||
| John C. March | January 2, 1911 - January 6, 1913 | |||
| Thomas D. Johnston | January 6, 1913 - January 4, 1915 | Contra Costa | ||
| William R. Sharkey | Progressive | January 4, 1915 - January 8, 1917 | ||
| William E. Calahan | Republican | January 8, 1917 - December 25, 1919 | Died in office.[3] | |
| James N. Long | January 3, 1921 - January 8, 1923 | |||
| Thomas M. Carlson | January 8, 1923 - January 5, 1925 | |||
| Robert P. Easley | January 5, 1925 - January 5, 1931 | |||
| Edwin H. Zion | January 5, 1931 - January 2, 1933 | Stanislaus | ||
| Charles W. Fisher | January 2, 1933 - January 4, 1937 | Alameda | ||
| Henry A. Dannenbrink | Democratic | January 4, 1937 - January 2, 1939 | ||
| James H. Phillips | Republican | January 2, 1939 - January 4, 1943 | ||
| Gardiner Johnson | January 4, 1943 - January 6, 1947 | |||
| Thomas W. Caldecott | January 6, 1947 - September 26, 1957 | Resigned from the Assembly to become a judge[4] | ||
| Don Mulford | January 3, 1958 - January 7, 1963 | Sworn in after winning a special election.[5] | ||
| Edward M. Gaffney | Democratic | January 7, 1963 - January 4, 1965 | San Francisco | |
| Willie Brown | January 4, 1965 - November 30, 1974 | |||
| Leo T. McCarthy | December 2, 1974 - November 30, 1982 | |||
| Alister McAlister | December 6, 1982 - November 30, 1986 | Alameda, Santa Clara | ||
| Delaine Eastin | December 1, 1986 - November 30, 1992 | |||
| Johan Klehs | December 7, 1992 - November 30, 1994 | Alameda | ||
| Michael Sweeny | December 5, 1994 - November 30, 1998 | |||
| Ellen Corbett | December 7, 1998 - November 30, 2004 | |||
| Johan Klehs | December 6, 2004 - November 30, 2006 | |||
| Mary Hayashi | December 4, 2006 - November 30, 2012 | |||
| Rob Bonta | December 3, 2012 - April 23, 2021 | Resigned from the Assembly to become State Attorney General | ||
| Mia Bonta | September 7, 2021 – present | Sworn in after winning special election. | ||
Primary was June 29, 2021; Special (label as General) on August 31, 2021.