California's 21st State Assembly district

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California's 21st State Assembly district
California's 21st State Assembly district
Current assemblymember
  Diane Papan
D–San Mateo
Population (2020)
 • Voting age
 • Citizen voting age		493,702 [1]
390,302 [1]
306,315 [1]
Demographics
Registered voters270,166
Registration55.75%  Democratic
14.15%  Republican
24.59 [2] %  No party preference

California's 21st State Assembly district is one of 80 California State Assembly districts. It is currently represented by Democrat Diane Papan of San Mateo.

Contents

District profile

The district includes most of San Mateo County, California.

Election results from statewide races

YearOfficeResults
2022 Governor Newsom 74.8 – 25.2%
Senator Padilla 76.2 – 23.8%
2021 Recall [3] [4] Dark Red x.svg 50.1 - 49.9%
Elder 58.8 - 6.3%
2020 President [5] Biden 55.3 – 42.3%
2018 Governor [6] Newsom 54.6 – 45.4%
Senator [7] De Leon 54.3 – 45.7%
2016 President Clinton 54.6 – 35.9%
Senator Harris 51.0 – 49.0%
2014 Governor Brown 53.6 – 46.4%
2012 President Obama 55.6 – 42.0%
Senator Feinstein 57.2 – 42.8%

List of assembly members representing the district

Due to redistricting, the 21st 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
C. B. Culver Republican January 5, 1885 – January 3, 1887 Yolo
Levi B. Adams Democratic January 3, 1887 – January 5, 1891
Reese Clark Republican January 5, 1891 – January 5, 1893
H. C. Chipman January 5, 1893 – January 7, 1895 Sacramento
L. T. Hatfield January 7, 1895 – January 4, 1897
Scott F. Ennis January 4, 1897 – January 2, 1899
William D. Knights January 2, 1899 – January 1, 1901
Louis F. Reeber Democratic January 1, 1901 – January 5, 1903
Stephen H. Olmsted Republican January 5, 1903 – January 7, 1907 Marin
Edward I. Butler January 7, 1907 – January 2, 1911
George H. Harlan January 2, 1911 – January 6, 1913
Walter A. McDonald January 6, 1913 – January 4, 1915 San Francisco
Prohibition January 4, 1915 – January 8, 1917
Frederick C. Hawes Republican January 8, 1917 – January 5, 1931
Frank Lee Crist January 5, 1931 – January 2, 1933 Santa Clara
Joseph P. Gilmore January 2, 1933 – January 4, 1937 San Francisco
Joseph Francis Sheehan Democratic January 4, 1937 – January 2, 1939
Joseph P. Gilmore Republican January 2, 1939 – January 6, 1941
John D. Welch Democratic January 6, 1941 – January 4, 1943
Albert C. Wollenberg Republican January 4, 1943 – September 19, 1947Resigned from the California State Assembly. [8]
VacantSeptember 19, 1947 – November 24, 1947
Arthur H. Connolly Jr. Republican November 24, 1947 – January 5, 1953Won special election to fill the vacant seat left by Wollenberg. He was sworn in on November 24, 1947. [9]
Caspar Weinberger January 5, 1953 – January 5, 1959
Milton Marks January 5, 1959 – October 25, 1966
VacantOctober 25, 1966 – January 2, 1967
Gordon W. Duffy Republican January 2, 1967 – November 30, 1974 Kings, Tulare
Victor Calvo Democratic December 2, 1974 – November 30, 1980 San Mateo, Santa Clara
Byron Sher December 1, 1980 – March 28, 1996Resigned from the California State Assembly to take Oath of office in the California State Senate for the 11th district after winning a special election. [10]
VacantMarch 28, 1996 – December 2, 1996
Ted Lempert Democratic December 2, 1996 – November 30, 2000
Joe Simitian December 4, 2000 – November 30, 2004
Ira Ruskin December 6, 2004 – November 30, 2010
Rich Gordon December 6, 2010 – November 30, 2012
Adam Gray December 3, 2012 – November 30, 2022 Merced, Stanislaus
Diane Papan December 5, 2022 – present San Mateo

Election results (1990–present)

2024

2024 California State Assembly 21st district election [11] [12]
Primary election
PartyCandidateVotes%
Democratic Diane Papan (incumbent) 77,204 75.3
Republican Mark Gilham 25,358 24.7
Total votes102,562 100.0
General election
Democratic Diane Papan (incumbent) 147,291 73.8
Republican Mark Gilham52,21826.2
Total votes199,509 100.0
Democratic hold

2022

2022 California State Assembly 21st district election [13] [14]
Primary election
PartyCandidateVotes%
Democratic Diane Papan 40,434 41.3
Democratic Giselle Hale 19,400 19.8
Republican Mark Gilham19,07819.5
Democratic James H. Coleman 11,26911.5
Democratic Alison M. Madden3,3593.4
Democratic Maurice Goodman2,6642.7
Green Tania Solé1,6201.7
Total votes97,824 100.0
General election
Democratic Diane Papan 94,676 72.4
Democratic Giselle Hale (withdrawn)36,01427.6
Total votes130,690 100.0
Democratic hold

2020

2020 California State Assembly 21st district election [15] [16]
Primary election
PartyCandidateVotes%
Democratic Adam Gray (incumbent) 54,987 99.0
Republican Joel Gutierrez Campos (write-in) 300 0.5
Republican Guadalupe Salazar (write-in)2560.5
Total votes55,543 100.0
General election
Democratic Adam Gray (incumbent) 93,816 59.6
Republican Joel Gutierrez Campos63,51440.4
Total votes157,330 100.0
Democratic hold

2018

2018 California State Assembly 21st district election [17] [18]
Primary election
PartyCandidateVotes%
Democratic Adam Gray (incumbent) 43,023 99.9
Libertarian Justin Ryan Quigley (write-in) 49 0.1
Total votes43,072 100.0
General election
Democratic Adam Gray (incumbent) 74,320 71.3
Libertarian Justin Ryan Quigley29,85528.7
Total votes104,175 100.0
Democratic hold

2016

2016 California State Assembly 21st district election [19] [20]
Primary election
PartyCandidateVotes%
Democratic Adam Gray (incumbent) 43,874 66.8
Republican Greg Opinski 21,754 33.1
Republican Brien J. Rahilly (write-in)360.1
Total votes65,664 100.0
General election
Democratic Adam Gray (incumbent) 85,990 69.8
Republican Greg Opinski37,23030.2
Total votes123,220 100.0
Democratic hold

2014

2014 California State Assembly 21st district election [21] [22]
Primary election
PartyCandidateVotes%
Democratic Adam Gray (incumbent) 26,015 95.3
Republican Jack Mobley (write-in) 1,286 4.7
Total votes27,301 100.0
General election
Democratic Adam Gray (incumbent) 34,931 53.4
Republican Jack Mobley30,49946.6
Total votes65,430 100.0
Democratic hold

2012

2012 California State Assembly 21st district election [23] [24]
Primary election
PartyCandidateVotes%
Republican Jack Mobley 20,148 45.4
Democratic Adam Gray 14,391 32.4
Democratic Lesa Rasmussen4,3059.7
Democratic Tommy Jones4,0559.1
Democratic Robert R. Sellers1,4523.3
Total votes44,351 100.0
General election
Democratic Adam Gray 63,349 58.2
Republican Jack Mobley45,53441.8
Total votes108,883 100.0
Democratic hold

2010

2010 California State Assembly 21st district election [25]
PartyCandidateVotes%
Democratic Rich Gordon 89,927 60.1
Republican Greg Conlon52,80935.3
Libertarian Ray M. Bell, Jr.6,9254.6
Total votes149,661 100.0
Democratic hold

2008

2008 California State Assembly 21st district election [26]
PartyCandidateVotes%
Democratic Ira Ruskin (incumbent) 133,856 70.9
Republican Annalisa Marie Temple54,84929.1
Total votes188,705 100.0
Democratic hold

2006

2006 California State Assembly 21st district election [27]
PartyCandidateVotes%
Democratic Ira Ruskin (incumbent) 95,104 67.8
Republican Virginia Kiraly45,31432.2
Total votes140,418 100.0
Democratic hold

2004

2004 California State Assembly 21st district election [28]
PartyCandidateVotes%
Democratic Ira Ruskin 98,002 51.5
Republican Steve Poizner 92,11848.5
Total votes190,120 100.0
Democratic hold

2002

2002 California State Assembly 21st district election [29]
PartyCandidateVotes%
Democratic Joe Simitian (incumbent) 72,104 60.5
Republican James A. Russell42,80836.0
Libertarian Raymond M. Bell, Jr.4,2863.5
Total votes119,198 100.0
Democratic hold

2000

2000 California State Assembly 21st district election [30]
PartyCandidateVotes%
Democratic Joe Simitian 82,466 54.9
Republican Deborah E. G. Wilder53,14035.4
Green Gloria Purcell14,6419.7
Total votes150,247 100.0
Democratic hold

1998

1998 California State Assembly 21st district election [31]
PartyCandidateVotes%
Democratic Ted Lempert (incumbent) 89,221 70.1
Republican Laverne F. Atherly35,05327.5
Natural Law Marilyn M. Bryant3,0362.4
Total votes127,310 100.0
Democratic hold

1996

1996 California State Assembly 21st district election [32]
PartyCandidateVotes%
Democratic Ted Lempert (incumbent) 92,950 60.8
Republican Theodore A. Laliotis52,85534.6
Natural Law Ron Whitehurst3,8642.5
Libertarian Christopher R. Inama3,1152.0
Total votes152,784 100.0
Democratic hold

1994

1994 California State Assembly 21st district election [33]
PartyCandidateVotes%
Democratic Byron D. Sher (incumbent) 79,188 62.6
Republican Bill Mills47,21937.4
No partyRonald Paul Whitehurst (write-in)30.0
Total votes126,410 100.0
Democratic hold

1992

1992 California State Assembly 21st district election [34]
PartyCandidateVotes%
Democratic Byron Sher (incumbent) 105,327 63.2
Republican Janice "Jan" LeFetra55,49733.3
Libertarian Lyn Sapowsky-Smith5,8873.5
Total votes166,711 100.0
Democratic hold

1990

1990 California State Assembly 21st district election [35]
PartyCandidateVotes%
Democratic Byron Sher (incumbent) 62,719 70.9
Republican Eric Garris 25,69529.1
Total votes88,414 100.0
Democratic hold

See also

References

  1. 1 2 3 4 "Citizens Redistricting Commission Final Report, 2021" (PDF).
  2. ↑ "Report of Registration as of February 10, 2023" (PDF).
  3. ↑ "Supplement to the Statement of Vote September 14, 2021, California Gubernatorial Recall Election Counties by Congressional Districts for Recall Question" (PDF). Archived (PDF) from the original on March 7, 2022.
  4. ↑ "Counties by Congressional Districts for Recall Election Gubernatorial Replacement Candidates" (PDF).
  5. ↑ "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.
  6. ↑ "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.
  7. ↑ "Supplement to the Statement of Vote" (PDF). ca.gov. Retrieved September 17, 2023.
  8. ↑ "Albert Wollenberg". joincalifornia.com.
  9. ↑ "Arthur Connolly Oath of Office" (PDF). clerk.assembly.ca.gov.
  10. ↑ "Byron Sher Resignation letter" (PDF). clerk.assembly.ca.gov.
  11. ↑ "March 5, 2024, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  12. ↑ "November 5, 2024, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  13. ↑ "June 7, 2022, Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  14. ↑ "November 8, 2022, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  15. ↑ "March 3, 2020, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  16. ↑ "November 3, 2020, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  17. ↑ "June 5, 2018, Statewide Direct Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  18. ↑ "November 6, 2018, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  19. ↑ "June 7, 2016, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  20. ↑ "November 8, 2016, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  21. ↑ "June 3, 2014, Statewide Direct Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  22. ↑ "November 4, 2014, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  23. ↑ "June 5, 2012, Presidential Primary Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  24. ↑ "November 6, 2012, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  25. ↑ "November 2, 2010, General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  26. ↑ "November 4, 2008, Presidential General Election - State Assemblymember" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  27. ↑ "November 7, 2006, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  28. ↑ "November 2, 2004, Presidential General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  29. ↑ "November 5, 2002, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  30. ↑ "November 7, 2000, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  31. ↑ "November 3, 1998, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  32. ↑ "November 5, 1996, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  33. ↑ "November 8, 1994, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  34. ↑ "November 3, 1992, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
  35. ↑ "November 6, 1990, General Election - Member of the State Assembly" (PDF). Secretary of State of California . Retrieved November 21, 2025.
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