California's 23rd State Assembly district

California's 23rd State Assembly district
California's 23rd State Assembly district
Current assemblymember
	Marc Berman ; D–Menlo Park
Population (2020); • Voting age; • Citizen voting age	474,000; 378,104; 305,410
Demographics	47.27% White ; 1.61% Black ; 13.36% Latino ; 31.02% Asian ; 0.12% Native American ; 0.32% Hawaiian/Pacific Islander ; 0.64% other; 5.65% remainder of multiracial;
Registered voters	282,794
Registration	54.27% Democratic ; 14.46% Republican ; 26.94% No party preference

Last updated June 18, 2025

California's 23rd State Assembly district is one of 80 California State Assembly districts. It is currently represented by Democrat Marc Berman of Menlo Park.

District profile

As of the 2020 redistricting (which took effect as of the 2022 elections), the district includes Silicon Valley communities, containing multiple notable high-tech companies and parts of the Caltrain corridor, as well as smaller, rural districts along the coast.

San Mateo County – 16.2%

Santa Clara County – 18.0%

Election results from statewide races

Due to redistricting, the 23rd district has been moved around different parts of the state.

Year	Office	Results
2022	Governor	Newsom 74.7 – 25.3%
2022	Senator	Padilla 76.2 – 23.8%
2021	Recall	Yes 56.5 – 43.5%
2020^[3]	President	Trump 50.2 – 47.8%
2018	Governor ^[4]	Cox 55.8 – 44.2%
2018	Senator ^[5]	De Leon 53.3 – 46.7%
2016	President	Trump 50.8 – 44.0%
2016	Senator	Harris 53.6 – 46.4%
2014	Governor	Kashkari 58.3 – 41.7%
2012	President	Romney 54.7 – 43.5%
2012	Senator	Emken 55.9 – 44.1%

List of assembly members

Due to redistricting, the 23rd district has been moved around different parts of the state.

Assembly members	Party	Years served	Counties represented	Notes
William T. Mears	Republican	January 5, 1885 – January 3, 1887	Sonoma
George W. Morgan	Democratic	January 3, 1887 – January 7, 1889
Felix B. Mulgrew	Democratic	January 7, 1889 – January 5, 1891
Frank J. Murphy	Democratic	January 5, 1891 – January 2, 1893
James I. Taylor	Republican	January 2, 1893 – January 7, 1895	Marin
James H. Wilkins	Democratic	January 7, 1895 – January 4, 1897
M. Canavan	Republican	January 4, 1897 – January 2, 1899
John W. Atherton		January 2, 1899 – January 5, 1903
Frank E. Dunlap		January 5, 1903 – January 2, 1905	San Joaquin
Robert Beardslee		January 2, 1905 – January 2, 1911
Elmer H. McGowen		January 2, 1911 – January 6, 1913
James J. Ryan		January 6, 1913 – January 6, 1919	San Francisco
Charles J. McColgan		January 6, 1919 – January 3, 1921
Joseph F. Burns	Democratic	January 3, 1921 – January 7, 1929
Joseph P. Gilmore	Republican	January 7, 1929 – January 2, 1933
William B. Hornblower	Republican	January 2, 1933 – January 2, 1939
Daniel Gallagher	Democratic	January 2, 1939 – January 7, 1942		Resigned to become a member of the San Francisco County Board of Supervisors
William Clifton Berry		January 4, 1943 – May 5, 1954		Died in office.
John A. O'Connell		January 3, 1955 – January 7, 1963
John Francis Foran		January 7, 1963 – November 30, 1974
John Vasconcellos		December 2, 1974 – November 30, 1992	Santa Clara
Dominic L. Cortese		December 7, 1992 – December 8, 1995		Changed his party affiliation from Democrat to Reform.^[6]
Dominic L. Cortese	Reform	December 8, 1995 – November 30, 1996		Changed his party affiliation from Democrat to Reform.^[6]
Mike Honda	Democratic	December 2, 1996 – November 30, 2000
Manny Diaz		December 4, 2000 – November 30, 2004
Joe Coto		December 6, 2004 – November 30, 2010
Nora Campos		December 6, 2010 – November 30, 2012
Jim Patterson	Republican	December 3, 2012 – November 30, 2022	Fresno, Tulare
Marc Berman	Democratic	December 5, 2022 – Present	San Mateo, Santa Clara

Election results (1992–present)

2024

2024 California State Assembly election ^[7]^[8]
Primary election
Party		Candidate	Votes	%
	Democratic	Marc Berman (incumbent)	67,177	57.4
	Democratic	Lydia Kou	23,723	20.3
	Republican	Gus Mattamal	13,290	11.4
	Republican	Allan Marson	12,900	11.0
Total votes			117,090	100.0
General election
	Democratic	Marc Berman (incumbent)	115,833	59.8
	Democratic	Lydia Kou	77,949	40.2
Total votes			193,782	100.0
	Democratic hold

2022

2022 California State Assembly election ^[9]
Primary election
Party		Candidate	Votes	%
	Democratic	Marc Berman (incumbent)	83,533	76.3
	Republican	Tim Dec	26,002	23.7
Total votes			109,535	100.0
General election
	Democratic	Marc Berman (incumbent)	124,602	73.4
	Republican	Tim Dec	45,149	26.6
Total votes			169,751	100.0
	Democratic gain from Republican

2020

2020 California State Assembly election
Primary election
Party		Candidate	Votes	%
	Republican	Jim Patterson (incumbent)	101,217	100.0%
Total votes			101,217	100.0%
General election
	Republican	Jim Patterson (incumbent)	177,600	100.0%
Total votes			177,600	100.0%
	Republican hold

2018

California State Assembly election, 2018
Primary election
Party		Candidate	Votes	%
	Republican	Jim Patterson (incumbent)	58,927	64.9
	Democratic	Aileen Rizo	31,902	35.1
Total votes			90,829	100.0
General election
	Republican	Jim Patterson (incumbent)	98,789	59.4
	Democratic	Aileen Rizo	67,443	40.6
Total votes			166,232	100.0
	Republican hold

2016

California State Assembly election, 2016
Primary election
Party		Candidate	Votes	%
	Republican	Jim Patterson (incumbent)	73,686	77.4
	Republican	Gwen L. Morris	21,522	22.6
Total votes			95,208	100.0
General election
	Republican	Jim Patterson (incumbent)	125,123	75.9
	Republican	Gwen L. Morris	39,656	24.1
Total votes			164,809	100.0
	Republican hold

2014

California State Assembly election, 2014
Primary election
Party		Candidate	Votes	%
	Republican	Jim Patterson (incumbent)	55,914	100.0
Total votes			55,914	100.0
General election
	Republican	Jim Patterson (incumbent)	82,417	100.0
Total votes			82,417	100.0
	Republican hold

2012

California State Assembly election, 2012
Primary election
Party		Candidate	Votes	%
	Republican	Jim Patterson	30,827	39.4
	Republican	Bob Whalen	19,992	25.5
	Democratic	Richard Rojas	17,690	22.6
	Republican	Vong Mouanoutoua	5,487	7.0
	Republican	David DeFrank	4,278	5.5
Total votes			78,274	100.0
General election
	Republican	Jim Patterson	83,817	54.7
	Republican	Bob Whalen	69,457	45.3
Total votes			153,274	100.0
	Republican gain from Democratic

2010

2010 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Nora Campos	58,629	75.1
	Republican	Atul Saini	19,494	24.9
Total votes			78,123	100.0
	Democratic hold

2008

2008 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Joe Coto (incumbent)	81,523	76.62
	Republican	Mark Patrosso	24,876	23.38
Total votes			106,399	100.00
Turnout				71.12
	Democratic hold

2006

2006 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Joe Coto (incumbent)	49,977	73.88
	Republican	Mark Patrosso	17,671	26.12
Total votes			67,648	100.00
Turnout				51.58
	Democratic hold

2004

2004 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Joe Coto	62,569	67.12
	Republican	Mark Patrosso	26,051	27.95
	Green	Warner S. Bloomberg IIi	4,597	4.93
Total votes			93,217	100.00
	Democratic hold

2002

2002 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Manny Diaz (incumbent)	42,428	81.55
	Green	Warner S. Bloomberg III	9,598	18.45
Invalid or blank votes			8,220	13.64
Total votes			60,246	100.00
	Democratic hold

2000

2000 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Manolo Diaz	58,020	71.60
	Republican	Tom Askeland	17,531	21.64
	Libertarian	Dana W. Albrecht	5,478	6.76
Invalid or blank votes			9,017	10.01
Total votes			90,046	100.00
	Democratic hold

1998

1998 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Mike Honda (incumbent)	45,340	75.77
	Republican	Patrick Du Long	14,498	24.23
Invalid or blank votes			6,125	9.29
Total votes			65,963	100.00
	Democratic hold

1996

1996 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Mike Honda	54,370	73.39
	Republican	Lisa M. Sutton	19,712	26.61
Invalid or blank votes			7,844	9.57
Total votes			81,926	100.00
	Democratic gain from Reform

1994

1994 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Dominic L. Cortese (incumbent)	36,575	64.33
	Republican	Frank Jewett	15,647	27.52
	Green	Tim K. Fitzgerald	4,630	8.14
Invalid or blank votes			10,009	14.97
Total votes			66,861	100.00
	Democratic hold

1992

1992 California State Assembly election
Party		Candidate	Votes	%
	Democratic	Dominic L. Cortese (incumbent)	54,539	65.91
	Republican	Monica A. Valladares	28,121	34.09
Invalid or blank votes			10,210	10.98
Total votes			92,870	100.00
	Democratic hold

References

1 2 3 4 "Citizens Redistricting Commission Final Report, 2021" (PDF).
↑ "California Secretary of State 15-Day Report February 20, 2024" (PDF).
↑ "2020 Presidential by Legislative District & Most Recent Election Result". CNalysis. April 16, 2021. Retrieved June 9, 2021.
↑ "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.
↑ "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.
↑ "Democratic Legislator Switches to Perot Party". Los Angeles Times . December 6, 1995.
↑ "Presidential Primary Election - Statement of Vote, March 5, 2024 - State Assembly" (PDF). Archived from the original (PDF) on April 13, 2024.
↑ "General Election - Statement of Vote, November 5, 2024 - State Assemblymember By District" (PDF). California Secretary of State .
↑ "General Election - Statement of the Vote, November 8, 2022 :: California Secretary of State". www.sos.ca.gov.

External links

District map from the California Citizens Redistricting Commission

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.

[population-1] 1 2 3 4 "Citizens Redistricting Commission Final Report, 2021" (PDF).

[registration-2] "California Secretary of State 15-Day Report February 20, 2024" (PDF).

[3] "2020 Presidential by Legislative District & Most Recent Election Result". CNalysis. April 16, 2021. Retrieved June 9, 2021.

[4] "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.

[5] "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.

[6] "Democratic Legislator Switches to Perot Party". Los Angeles Times . December 6, 1995.

[7] "Presidential Primary Election - Statement of Vote, March 5, 2024 - State Assembly" (PDF). Archived from the original (PDF) on April 13, 2024.

[8] "General Election - Statement of Vote, November 5, 2024 - State Assemblymember By District" (PDF). California Secretary of State .

[9] "General Election - Statement of the Vote, November 8, 2022 :: California Secretary of State". www.sos.ca.gov.

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