California's 18th State Assembly district

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California's 18th State Assembly district
California's 18th State Assembly district
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

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

Contents

District profile

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

Election results from statewide races

YearOfficeResults
2021 Governor Newsom 90 – 10%
Senator Padilla 90.5 – 9.5%
2021 Recall Dark Red x.svg 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

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 membersPartyYears servedCounties representedNotes
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, 1919Died in office. [3]
VacantDecember 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, 1957Resigned from the State Assembly to become a judge. [4]
VacantSeptember 26, 1957 – January 3, 1958
Don Mulford Republican January 3, 1958 – January 7, 1963Sworn 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, 2021Resigned from the State Assembly to become the Attorney General of California.
VacantApril 23, 2021 – September 7, 2021
Mia Bonta Democratic September 7, 2021 – presentSworn in after winning special election.

Election results (1990–present)

2024

2024 California State Assembly 18th district election [6] [7]
Primary election
PartyCandidateVotes%
Democratic Mia Bonta (incumbent) 73,155 84.9
American Independent Andre Sandford 4,582 5.3
Republican Mindy Pechenuk4,3975.1
Republican Cheyenne Kenney4,0124.7
Total votes86,146 100.0
General election
Democratic Mia Bonta (incumbent) 134,073 80.3
American Independent Andre Sandford32,98319.7
Total votes167,056 100.0
Democratic hold

2022

2022 California State Assembly 18th district election [8] [9]
Primary election
PartyCandidateVotes%
Democratic Mia Bonta 69,142 100.0
Republican Mindy Pechenuk (write-in) 31 0.0
Total votes69,173 100.0
General election
Democratic Mia Bonta 120,863 89.9
Republican Mindy Pechenuk13,50410.1
Total votes134,367 100.0
Democratic hold

2021 (special)

2021 California State Assembly 18th district special election
Vacancy resulting from the resignation of Rob Bonta [10] [11]
Primary election
PartyCandidateVotes%
Democratic Mia Bonta 22,558 38.0
Democratic Janani Ramachandran 14,036 23.7
Democratic Malia Vella10,05316.9
Republican Stephen Slauson5,7259.6
Democratic Victor Aguilar3,9386.6
Democratic James Aguilar1,0391.8
Democratic Eugene Canson1,0291.7
No party preference Joel Britton7501.3
Total votes59,128 100.0
General election
Democratic Mia Bonta 43,762 56.9
Democratic Janani Ramachandran33,18143.1
Total votes76,943 100.0
Democratic hold

2020

2020 California State Assembly 18th district election [12] [13]
Primary election
PartyCandidateVotes%
Democratic Rob Bonta (incumbent) 118,300 89.3
Republican Stephen Slauson 14,158 10.7
Total votes132,458 100.0
General election
Democratic Rob Bonta (incumbent) 190,168 87.6
Republican Stephen Slauson26,94212.4
Total votes217,110 100.0
Democratic hold

2018

2018 California State Assembly 18th district election [14] [15]
Primary election
PartyCandidateVotes%
Democratic Rob Bonta (incumbent) 85,354 89.0
Republican Stephen Slauson 10,549 11.0
Total votes95,903 100.0
General election
Democratic Rob Bonta (incumbent) 150,862 88.9
Republican Stephen Slauson18,89411.1
Total votes184,754 100.0
Democratic hold

2016

2016 California State Assembly 18th district election [16] [17]
Primary election
PartyCandidateVotes%
Democratic Rob Bonta (incumbent) 98,202 89.1
Republican Roseann Slonsky-Breault 12,057 10.9
Total votes110,259 100.0
General election
Democratic Rob Bonta (incumbent) 156,163 87.0
Republican Roseann Slonsky-Breault23,27313.0
Total votes179,436 100.0
Democratic hold

2014

2014 California State Assembly 18th district election [18] [19]
Primary election
PartyCandidateVotes%
Democratic Rob Bonta (incumbent) 44,321 85.8
Republican David Erlich 7,358 14.2
Total votes51,679 100.0
General election
Democratic Rob Bonta (incumbent) 88,243 86.7
Republican David Erlich13,53713.3
Total votes101,780 100.0
Democratic hold

2012

2012 California State Assembly 18th district election [20] [21]
Primary election
PartyCandidateVotes%
Democratic Rob Bonta 23,007 36.9
Democratic Abel Guillen 18,521 29.7
Democratic Joel Young11,68018.8
Republican Rhonda Weber9,08214.6
Total votes62,290 100.0
General election
Democratic Rob Bonta 75,865 50.5
Democratic Abel Guillen74,42249.5
Total votes150,287 100.0
Democratic hold

2010

2010 California State Assembly 18th district election [22]
PartyCandidateVotes%
Democratic Mary Hayashi (incumbent) 85,237 75.2
Republican Michael Havig28,12424.8
Total votes113,361 100.0
Democratic hold

2008

2008 California State Assembly 18th district election [23]
PartyCandidateVotes%
Democratic Mary Hayashi (incumbent) 115,780 77.5
Republican Lou Filipovich33,59622.5
Total votes149,376 100.0
Democratic hold

2006

2006 California State Assembly 18th district election [24]
PartyCandidateVotes%
Democratic Mary Hayashi 69,411 67.8
Republican Jill Buck32,89732.2
Total votes102,308 100.0
Democratic hold

2004

2004 California State Assembly 18th district election [25]
PartyCandidateVotes%
Democratic Johan Klehs (incumbent) 106,635 83.6
Libertarian Ronald J. Colfer20,88816.4
No partyLou Filipovich (write-in)170.0
Total votes127,540 100.0
Democratic hold

2002

2002 California State Assembly 18th district election [26]
PartyCandidateVotes%
Democratic Ellen M. Corbett (incumbent) 60,627 71.7
Republican Jack Hovingh24,02828.3
Total votes84,655 100.0
Democratic hold

2000

2000 California State Assembly 18th district election [27]
PartyCandidateVotes%
Democratic Ellen Corbett (incumbent) 91,991 75.4
Republican Syed Rifat Mahmood29,93624.6
Total votes121,927 100.0
Democratic hold

1998

1998 California State Assembly 18th district election [28]
PartyCandidateVotes%
Democratic Ellen M. Corbett 63,491 65.8
Republican Carol Nowicki33,06034.2
Total votes96,551 100.0
Democratic hold

1996

1996 California State Assembly 18th district election [29]
PartyCandidateVotes%
Democratic Michael Sweeney (incumbent) 89,122 100.0
Total votes89,122 100.0
Democratic hold

1994

1994 California State Assembly 18th district election [30]
PartyCandidateVotes%
Democratic Michael Sweeney 69,863 69.7
Republican Don J. Grundmann30,31030.3
Total votes100,173 100.0
Democratic hold

1992

1992 California State Assembly 18th district election [31]
PartyCandidateVotes%
Democratic Johan Klehs (incumbent) 87,971 65.0
Republican Don J. Grundmann38,02728.1
Libertarian Terry L. Floyd9,2976.9
Total votes135,295 100.0
Democratic hold

1990

1990 California State Assembly 18th district election [32]
PartyCandidateVotes%
Democratic Delaine Eastin (incumbent) 65,654 100.0
Total votes65,654 100.0
Democratic hold

See also

References

  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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