Wikipedia

California's 21st State Assembly district

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.

California's 21st State Assembly district
Map
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

District profile

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Election results from statewide races

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Year Office Results
2022 Governor Newsom 74.8 – 25.2%
Senator Padilla 76.2 – 23.8%
2021 Recall[3][4] No 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

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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 members Party Years served Counties represented Notes
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, 1947 Resigned from the California State Assembly.[8]
Vacant September 19, 1947 – November 24, 1947
Arthur H. Connolly Jr. Republican November 24, 1947 – January 5, 1953 Won 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
Vacant October 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, 1996 Resigned 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]
Vacant March 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)

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2024

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2024 California State Assembly 21st district election[11][12]
Primary election
Party Candidate Votes %
Democratic Diane Papan (incumbent) 77,204 75.3
Republican Mark Gilham 25,358 24.7
Total votes 102,562 100.0
General election
Democratic Diane Papan (incumbent) 147,291 73.8
Republican Mark Gilham 52,218 26.2
Total votes 199,509 100.0
Democratic hold

2022

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2022 California State Assembly 21st district election[13][14]
Primary election
Party Candidate Votes %
Democratic Diane Papan 40,434 41.3
Democratic Giselle Hale 19,400 19.8
Republican Mark Gilham 19,078 19.5
Democratic James H. Coleman 11,269 11.5
Democratic Alison M. Madden 3,359 3.4
Democratic Maurice Goodman 2,664 2.7
Green Tania Solé 1,620 1.7
Total votes 97,824 100.0
General election
Democratic Diane Papan 94,676 72.4
Democratic Giselle Hale (withdrawn) 36,014 27.6
Total votes 130,690 100.0
Democratic hold

2020

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2020 California State Assembly 21st district election[15][16]
Primary election
Party Candidate Votes %
Democratic Adam Gray (incumbent) 54,987 99.0
Republican Joel Gutierrez Campos (write-in) 300 0.5
Republican Guadalupe Salazar (write-in) 256 0.5
Total votes 55,543 100.0
General election
Democratic Adam Gray (incumbent) 93,816 59.6
Republican Joel Gutierrez Campos 63,514 40.4
Total votes 157,330 100.0
Democratic hold

2018

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2018 California State Assembly 21st district election[17][18]
Primary election
Party Candidate Votes %
Democratic Adam Gray (incumbent) 43,023 99.9
Libertarian Justin Ryan Quigley (write-in) 49 0.1
Total votes 43,072 100.0
General election
Democratic Adam Gray (incumbent) 74,320 71.3
Libertarian Justin Ryan Quigley 29,855 28.7
Total votes 104,175 100.0
Democratic hold

2016

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2016 California State Assembly 21st district election[19][20]
Primary election
Party Candidate Votes %
Democratic Adam Gray (incumbent) 43,874 66.8
Republican Greg Opinski 21,754 33.1
Republican Brien J. Rahilly (write-in) 36 0.1
Total votes 65,664 100.0
General election
Democratic Adam Gray (incumbent) 85,990 69.8
Republican Greg Opinski 37,230 30.2
Total votes 123,220 100.0
Democratic hold

2014

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2014 California State Assembly 21st district election[21][22]
Primary election
Party Candidate Votes %
Democratic Adam Gray (incumbent) 26,015 95.3
Republican Jack Mobley (write-in) 1,286 4.7
Total votes 27,301 100.0
General election
Democratic Adam Gray (incumbent) 34,931 53.4
Republican Jack Mobley 30,499 46.6
Total votes 65,430 100.0
Democratic hold

2012

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2012 California State Assembly 21st district election[23][24]
Primary election
Party Candidate Votes %
Republican Jack Mobley 20,148 45.4
Democratic Adam Gray 14,391 32.4
Democratic Lesa Rasmussen 4,305 9.7
Democratic Tommy Jones 4,055 9.1
Democratic Robert R. Sellers 1,452 3.3
Total votes 44,351 100.0
General election
Democratic Adam Gray 63,349 58.2
Republican Jack Mobley 45,534 41.8
Total votes 108,883 100.0
Democratic hold

2010

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2010 California State Assembly 21st district election[25]
Party Candidate Votes %
Democratic Rich Gordon 89,927 60.1
Republican Greg Conlon 52,809 35.3
Libertarian Ray M. Bell, Jr. 6,925 4.6
Total votes 149,661 100.0
Democratic hold

2008

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2008 California State Assembly 21st district election[26]
Party Candidate Votes %
Democratic Ira Ruskin (incumbent) 133,856 70.9
Republican Annalisa Marie Temple 54,849 29.1
Total votes 188,705 100.0
Democratic hold

2006

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2006 California State Assembly 21st district election[27]
Party Candidate Votes %
Democratic Ira Ruskin (incumbent) 95,104 67.8
Republican Virginia Kiraly 45,314 32.2
Total votes 140,418 100.0
Democratic hold

2004

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2004 California State Assembly 21st district election[28]
Party Candidate Votes %
Democratic Ira Ruskin 98,002 51.5
Republican Steve Poizner 92,118 48.5
Total votes 190,120 100.0
Democratic hold

2002

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2002 California State Assembly 21st district election[29]
Party Candidate Votes %
Democratic Joe Simitian (incumbent) 72,104 60.5
Republican James A. Russell 42,808 36.0
Libertarian Raymond M. Bell, Jr. 4,286 3.5
Total votes 119,198 100.0
Democratic hold

2000

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2000 California State Assembly 21st district election[30]
Party Candidate Votes %
Democratic Joe Simitian 82,466 54.9
Republican Deborah E. G. Wilder 53,140 35.4
Green Gloria Purcell 14,641 9.7
Total votes 150,247 100.0
Democratic hold

1998

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1998 California State Assembly 21st district election[31]
Party Candidate Votes %
Democratic Ted Lempert (incumbent) 89,221 70.1
Republican Laverne F. Atherly 35,053 27.5
Natural Law Marilyn M. Bryant 3,036 2.4
Total votes 127,310 100.0
Democratic hold

1996

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1996 California State Assembly 21st district election[32]
Party Candidate Votes %
Democratic Ted Lempert (incumbent) 92,950 60.8
Republican Theodore A. Laliotis 52,855 34.6
Natural Law Ron Whitehurst 3,864 2.5
Libertarian Christopher R. Inama 3,115 2.0
Total votes 152,784 100.0
Democratic hold

1994

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1994 California State Assembly 21st district election[33]
Party Candidate Votes %
Democratic Byron D. Sher (incumbent) 79,188 62.6
Republican Bill Mills 47,219 37.4
No party Ronald Paul Whitehurst (write-in) 3 0.0
Total votes 126,410 100.0
Democratic hold

1992

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1992 California State Assembly 21st district election[34]
Party Candidate Votes %
Democratic Byron Sher (incumbent) 105,327 63.2
Republican Janice "Jan" LeFetra 55,497 33.3
Libertarian Lyn Sapowsky-Smith 5,887 3.5
Total votes 166,711 100.0
Democratic hold

1990

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1990 California State Assembly 21st district election[35]
Party Candidate Votes %
Democratic Byron Sher (incumbent) 62,719 70.9
Republican Eric Garris 25,695 29.1
Total votes 88,414 100.0
Democratic hold

See also

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References

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  1. 1 2 3 4 "Citizens Redistricting Commission Final Report, 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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