Wikipedia

California's 18th State Assembly district

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 married to her predecessor and the state's 34th Attorney General, Rob Bonta.

California's 18th State Assembly district
Map
Current assemblymember
  Mia Bonta
D–Alameda
Population (2010)
 • Voting age
 • Citizen voting age		469,665[1]
365,624[1]
281,791[1]
Demographics
Registered voters270,094
Registration64.05% Democratic
6.82% Republican
24.79% No party preference

District profile

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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%
Senator Padilla 90.5 – 9.5%
2021 Recall No 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%

List of assembly members representing the district

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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 2021 redistricting by the California Citizens Redistricting Commission.

Assembly members Party Years served Counties represented Notes
Hugh McElroy LaRue Democratic January 3, 1883 – January 5, 1885 Sacramento
Winfield J. Davis Republican January 5, 1885 – January 3, 1887
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]
Vacant December 25, 1919 – January 3, 1921
James N. Long Republican 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 State Assembly to become a judge.[4]
Vacant September 26, 1957 – January 3, 1958
Don Mulford Republican 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 State Assembly to become the Attorney General of California.
Vacant April 23, 2021 – September 7, 2021
Mia Bonta Democratic September 7, 2021 – present Sworn in after winning special election.

Election results (1990–present)

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2024

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2024 California State Assembly 18th district election[6][7]
Primary election
Party Candidate Votes %
Democratic Mia Bonta (incumbent) 73,155 84.9
American Independent Andre Sandford 4,582 5.3
Republican Mindy Pechenuk 4,397 5.1
Republican Cheyenne Kenney 4,012 4.7
Total votes 86,146 100.0
General election
Democratic Mia Bonta (incumbent) 134,073 80.3
American Independent Andre Sandford 32,983 19.7
Total votes 167,056 100.0
Democratic hold

2022

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2022 California State Assembly 18th district election[8][9]
Primary election
Party Candidate Votes %
Democratic Mia Bonta 69,142 100.0
Republican Mindy Pechenuk (write-in) 31 0.0
Total votes 69,173 100.0
General election
Democratic Mia Bonta 120,863 89.9
Republican Mindy Pechenuk 13,504 10.1
Total votes 134,367 100.0
Democratic hold

2021 (special)

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2021 California State Assembly 18th district special election
Vacancy resulting from the resignation of Rob Bonta[10][11]
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
Total votes 59,128 100.0
General election
Democratic Mia Bonta 43,762 56.9
Democratic Janani Ramachandran 33,181 43.1
Total votes 76,943 100.0
Democratic hold

2020

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2020 California State Assembly 18th district election[12][13]
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

2018

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2018 California State Assembly 18th district election[14][15]
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

2016

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2016 California State Assembly 18th district election[16][17]
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

2014

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2014 California State Assembly 18th district election[18][19]
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

2012

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2012 California State Assembly 18th district election[20][21]
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

2010

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2010 California State Assembly 18th district election[22]
Party Candidate Votes %
Democratic Mary Hayashi (incumbent) 85,237 75.2
Republican Michael Havig 28,124 24.8
Total votes 113,361 100.0
Democratic hold

2008

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2008 California State Assembly 18th district election[23]
Party Candidate Votes %
Democratic Mary Hayashi (incumbent) 115,780 77.5
Republican Lou Filipovich 33,596 22.5
Total votes 149,376 100.0
Democratic hold

2006

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2006 California State Assembly 18th district election[24]
Party Candidate Votes %
Democratic Mary Hayashi 69,411 67.8
Republican Jill Buck 32,897 32.2
Total votes 102,308 100.0
Democratic hold

2004

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2004 California State Assembly 18th district election[25]
Party Candidate Votes %
Democratic Johan Klehs (incumbent) 106,635 83.6
Libertarian Ronald J. Colfer 20,888 16.4
No party Lou Filipovich (write-in) 17 0.0
Total votes 127,540 100.0
Democratic hold

2002

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2002 California State Assembly 18th district election[26]
Party Candidate Votes %
Democratic Ellen M. Corbett (incumbent) 60,627 71.7
Republican Jack Hovingh 24,028 28.3
Total votes 84,655 100.0
Democratic hold

2000

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2000 California State Assembly 18th district election[27]
Party Candidate Votes %
Democratic Ellen Corbett (incumbent) 91,991 75.4
Republican Syed Rifat Mahmood 29,936 24.6
Total votes 121,927 100.0
Democratic hold

1998

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1998 California State Assembly 18th district election[28]
Party Candidate Votes %
Democratic Ellen M. Corbett 63,491 65.8
Republican Carol Nowicki 33,060 34.2
Total votes 96,551 100.0
Democratic hold

1996

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1996 California State Assembly 18th district election[29]
Party Candidate Votes %
Democratic Michael Sweeney (incumbent) 89,122 100.0
Total votes 89,122 100.0
Democratic hold

1994

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1994 California State Assembly 18th district election[30]
Party Candidate Votes %
Democratic Michael Sweeney 69,863 69.7
Republican Don J. Grundmann 30,310 30.3
Total votes 100,173 100.0
Democratic hold

1992

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1992 California State Assembly 18th district election[31]
Party Candidate Votes %
Democratic Johan Klehs (incumbent) 87,971 65.0
Republican Don J. Grundmann 38,027 28.1
Libertarian Terry L. Floyd 9,297 6.9
Total votes 135,295 100.0
Democratic hold

1990

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1990 California State Assembly 18th district election[32]
Party Candidate Votes %
Democratic Delaine Eastin (incumbent) 65,654 100.0
Total votes 65,654 100.0
Democratic hold

See also

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References

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  1. 1 2 3 4 "Citizens Redistricting Commission Final Report, 2011" (PDF).
  2. ↑ "2020 Presidential by Legislative District & Most Recent Election Result". CNalysis. Archived from the original on June 4, 2021. Retrieved June 9, 2021.
  3. ↑ "William Calahan" (PDF). clerk.assembly.ca.gov.
  4. ↑ "Thomas W. Caldecott". joincalifornia.com.
  5. ↑ "Don Mulford Oath of Office" (PDF). clerk.assembly.ca.gov.
  6. ↑ "March 5, 2024, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  7. ↑ "November 5, 2024, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  8. ↑ "June 7, 2022, Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  9. ↑ "November 8, 2022, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  10. ↑ "Official Canvass - State Assembly - 18th Assembly District* - Special Primary Election, June 29, 2021" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  11. ↑ "Official Canvass - State Assembly - 18th Assembly District* - Special General Election, August 31, 2021" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  12. ↑ "March 3, 2020, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  13. ↑ "November 3, 2020, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  14. ↑ "June 5, 2018, Statewide Direct Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  15. ↑ "November 6, 2018, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  16. ↑ "June 7, 2016, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  17. ↑ "November 8, 2016, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  18. ↑ "June 3, 2014, Statewide Direct Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  19. ↑ "November 4, 2014, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  20. ↑ "June 5, 2012, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  21. ↑ "November 6, 2012, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  22. ↑ "November 2, 2010, General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  23. ↑ "November 4, 2008, Presidential General Election - State Assemblymember" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  24. ↑ "November 7, 2006, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  25. ↑ "November 2, 2004, Presidential General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  26. ↑ "November 5, 2002, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  27. ↑ "November 7, 2000, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  28. ↑ "November 3, 1998, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  29. ↑ "November 5, 1996, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  30. ↑ "November 8, 1994, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  31. ↑ "November 3, 1992, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
  32. ↑ "November 6, 1990, General Election - Member of the State Assembly" (PDF). Secretary of State of California. Retrieved November 19, 2025.
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