California's 18th State Assembly district

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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. She is the wife of the current of the current State Attorney General Rob Bonta, who was the former representative of the district.

Current assemblymember

Mia Bonta
D–Alameda

Population (2010)
• Voting age
• Citizen voting age

469,665^[1]
365,624^[1]
281,791^[1]

Demographics

23.96% White
23.32% Black
26.30% Latino
23.50% Asian
0.56% Native American
0.70% Hawaiian/Pacific Islander
0.33% other
1.33^[1]% remainder of multiracial

Registered voters

270,094

Registration

64.05% Democratic
6.82% Republican
24.79% No party preference

The district encompasses the central East Bay, centered on the city of Oakland.

Election results from statewide races

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Year	Office	Results
2021	Governor	Newsom 90 – 10%
2021	Senator	Padilla 90.5 – 9.5%
2021	Recall	No 88.9 – 11.1%
2020	President^[2]	Biden 86.5 – 11.3%
2018	Governor	Newsom 88.3 – 11.7%
2018	Senator	Feinstein 58.9 – 41.1%
2016	President	Clinton 85.9 – 8.4%
2016	Senator	Harris 78.7 – 21.3%
2014	Governor	Brown 89.6 – 10.4%
2012	President	Obama 86.9 – 10.2%
2012	Senator	Feinstein 89.5 – 10.5%

List of assembly members

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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	Alameda, Santa Clara
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.

Election results (1992–present)

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2022 California State Assembly election
Primary election
Party		Candidate	Votes	%
	Democratic	Mia Bonta	69,142	100.00
	Republican	Mindy Pechenuk (write-in)	31	0.00
Total votes			69,173	100.00
General election
	Democratic	Mia Bonta	120,863	89.90
	Republican	Mindy Pechenuk	13,504	10.10
Total votes			134,367	100.00
	Democratic hold

Primary was June 29, 2021; Special (label as General) on August 31, 2021.

California's 18 State Assembly district special election, 2021
Primary election
Party		Candidate	Votes	%
	Democratic	Mia Bonta	22,558	38.0
	Democratic	Janani Ramachandran	14,036	23.7
	Democratic	Malia Vella	10,053	16.9
	Republican	Stephen Slauson	5,725	9.6
	Democratic	Victor Aguilar	3,938	6.6
	Democratic	James Aguilar	1,039	1.8
	Democratic	Eugene Canson	1,029	1.7
	No party preference	Joel Britton	750	1.3
	N/A	Nelsy Batista (write-in)	13	0.0
	N/A	Other write-in candidates	187	0.3
Total votes			59,328	100.0
General election
	Democratic	Mia Bonta	43,460	56.8
	Democratic	Janani Ramachandran	33,012	43.2
Total votes			76,472	100.0
	Democratic hold

2020 California State Assembly election
Primary election
Party		Candidate	Votes	%
	Democratic	Rob Bonta (incumbent)	118,300	89.3
	Republican	Stephen Slauson	14,158	10.7
Total votes			132,458	100.0
General election
	Democratic	Rob Bonta (incumbent)	190,168	87.6%
	Republican	Stephen Slauson	26,942	12.4%
Total votes			217,110	100.0%
	Democratic hold

California State Assembly election, 2018
Primary election
Party		Candidate	Votes	%
	Democratic	Rob Bonta (incumbent)	85,354	89.0
	Republican	Stephen Slauson	10,549	11.0
Total votes			95,903	100.0
General election
	Democratic	Rob Bonta (incumbent)	150,862	88.9
	Republican	Stephen Slauson	18,894	11.1
Total votes			184,754	100.0
	Democratic hold

California State Assembly election, 2016
Primary election
Party		Candidate	Votes	%
	Democratic	Rob Bonta (incumbent)	98,202	89.1
	Republican	Roseann Slonsky-Breault	12,057	10.9
Total votes			110,259	100.0
General election
	Democratic	Rob Bonta (incumbent)	156,163	87.0
	Republican	Roseann Slonsky-Breault	23,273	13.0
Total votes			179,436	100.0
	Democratic hold

California State Assembly election, 2014
Primary election
Party		Candidate	Votes	%
	Democratic	Rob Bonta (incumbent)	44,321	85.8
	Republican	David Erlich	7,358	14.2
Total votes			51,679	100.0
General election
	Democratic	Rob Bonta (incumbent)	88,243	86.7
	Republican	David Erlich	13,537	13.3
Total votes			101,780	100.0
	Democratic hold

California State Assembly election, 2012
Primary election
Party		Candidate	Votes	%
	Democratic	Rob Bonta	23,007	36.9
	Democratic	Abel Guillen	18,521	29.7
	Democratic	Joel Young	11,680	18.8
	Republican	Rhonda Weber	9,082	14.6
Total votes			62,290	100.0
General election
	Democratic	Rob Bonta	75,865	50.5
	Democratic	Abel Guillen	74,422	49.5
Total votes			150,287	100.0
	Democratic hold

^ ^a ^b ^c ^d "Citizens Redistricting Commission Final Report, 2011" (PDF).
^ "2020 Presidential by Legislative District & Most Recent Election Result". CNalysis. Retrieved June 9, 2021.
^ "William Calahan" (PDF). clerk.assembly.ca.gov.
^ "Thomas W. Caldecott". joincalifornia.com.
^ "Don Mulford Oath of Office" (PDF). clerk.assembly.ca.gov.

District map from the California Citizens Redistricting Commission