California Assembly District 18
Tue, Nov 3 · Represented by Mia Bonta Democratic · Member list as of Oct 28
Mia BontaDemocratic · Incumbent4 years since first winAndre SandfordDemocratic
Mia Bonta 80.3Andre Sandford 19.7
Last result · 2024 general
- Earlier results
- Mia Bonta (Democratic) won by 79.9 points, 2022Rob Bonta (Democratic) won by 75.2 points, 2020, older linesAll 29 elections
Side by side
Left column: BontaRight column: Sandford
- Donor-based spectrum
- LiberalCentristConservativeBontaNo published score for Sandford
- Races
- Won 2 of 2
- Won 0 of 1
How these are counted
The spectrum is a published research score, not our rating. How this works. Wins and losses count the races in our results files, the same as each profile.
Past results
- Votes for listed candidates
- 167,056
- Election day
- November 5, 2024
- District map
- Same as today
California Assembly District 18, 1968 to 2024, 2024, every candidate Candidate Party Votes and share Share DemocraticMia BontaWon(incumbent) Democratic 134,07380.3% OtherAndre Sandford Other 32,98319.7% - Votes for listed candidates
- 134,367
- Election day
- November 8, 2022
- District map
- Same as today
California Assembly District 18, 1968 to 2024, 2022, every candidate Candidate Party Votes and share Share DemocraticMia BontaWon Democratic 120,86390.0% RepublicanMindy Pechenuk Republican 13,50410.1% - Votes for listed candidates
- 217,110
- Election day
- November 3, 2020
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2020, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon(incumbent) Democratic 190,16887.6% RepublicanStephen Slauson Republican 26,94212.4% - Votes for listed candidates
- 169,756
- Election day
- November 6, 2018
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2018, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon(incumbent) Democratic 150,86288.9% RepublicanStephen Slauson Republican 18,89411.1%
- 2024: California Secretary of State, Statement of Vote, Nov 5 2024 general (summary pages), retrieved Oct 28, 2026
- 1968 to 2022: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), retrieved Oct 28, 2026. Compiled by Carl Klarner (Harvard Dataverse) from official returns; not an official source
Last contest in this district on file: 2024.
All elections (29 for this seat)
- Votes for listed candidates
- 167,056
- Election day
- November 5, 2024
- District map
- Same as today
California Assembly District 18, 1968 to 2024, 2024, every candidate Candidate Party Votes and share Share DemocraticMia BontaWon(incumbent) Democratic 134,07380.3% OtherAndre Sandford Other 32,98319.7% - Votes for listed candidates
- 134,367
- Election day
- November 8, 2022
- District map
- Same as today
California Assembly District 18, 1968 to 2024, 2022, every candidate Candidate Party Votes and share Share DemocraticMia BontaWon Democratic 120,86390.0% RepublicanMindy Pechenuk Republican 13,50410.1% - Votes for listed candidates
- 217,110
- Election day
- November 3, 2020
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2020, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon(incumbent) Democratic 190,16887.6% RepublicanStephen Slauson Republican 26,94212.4% - Votes for listed candidates
- 169,756
- Election day
- November 6, 2018
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2018, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon(incumbent) Democratic 150,86288.9% RepublicanStephen Slauson Republican 18,89411.1% - Votes for listed candidates
- 179,436
- Election day
- November 8, 2016
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2016, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon(incumbent) Democratic 156,16387.0% RepublicanRoseann Slonsky-Breault Republican 23,27313.0% - Votes for listed candidates
- 101,780
- Election day
- November 4, 2014
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2014, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon(incumbent) Democratic 88,24386.7% RepublicanDavid Erlich Republican 13,53713.3% - Votes for listed candidates
- 150,287
- Election day
- November 6, 2012
- District map
- Older district map (2012 to 2021)
California Assembly District 18, 1968 to 2024, 2012, every candidate Candidate Party Votes and share Share DemocraticRob BontaWon Democratic 75,86550.5% DemocraticAbel Guillen Democratic 74,42249.5% - Votes for listed candidates
- 113,361
- Election day
- November 2, 2010
- District map
- Older district map (2002 to 2011)
California Assembly District 18, 1968 to 2024, 2010, every candidate Candidate Party Votes and share Share DemocraticMary HayashiWon(incumbent) Democratic 85,23775.2% RepublicanMichael Havig Republican 28,12424.8% - Votes for listed candidates
- 149,376
- Election day
- November 4, 2008
- District map
- Older district map (2002 to 2011)
California Assembly District 18, 1968 to 2024, 2008, every candidate Candidate Party Votes and share Share DemocraticMary HayashiWon(incumbent) Democratic 115,78077.5% RepublicanLou Filipovich Republican 33,59622.5% - Votes for listed candidates
- 102,308
- Election day
- November 7, 2006
- District map
- Older district map (2002 to 2011)
California Assembly District 18, 1968 to 2024, 2006, every candidate Candidate Party Votes and share Share DemocraticMary HayashiWon Democratic 69,41167.8% RepublicanJill Buck Republican 32,89732.1% - Votes for listed candidates
- 127,253
- Election day
- November 2, 2004
- District map
- Older district map (2002 to 2011)
California Assembly District 18, 1968 to 2024, 2004, every candidate Candidate Party Votes and share Share DemocraticJohan KlehsWon Democratic 106,36583.6% LibertarianRonald J. Colfer Libertarian 20,88816.4% - Votes for listed candidates
- 84,655
- Election day
- November 5, 2002
- District map
- Older district map (2002 to 2011)
California Assembly District 18, 1968 to 2024, 2002, every candidate Candidate Party Votes and share Share DemocraticEllen M. CorbettWon(incumbent) Democratic 60,62771.6% RepublicanJack Hovingh Republican 24,02828.4% - Votes for listed candidates
- 121,927
- Election day
- November 7, 2000
- District map
- Older district map (1992 to 2001)
California Assembly District 18, 1968 to 2024, 2000, every candidate Candidate Party Votes and share Share DemocraticEllen M. CorbettWon(incumbent) Democratic 91,99175.5% RepublicanSyed Mahmood Republican 29,93624.6% - Votes for listed candidates
- 96,551
- Election day
- November 3, 1998
- District map
- Older district map (1992 to 2001)
California Assembly District 18, 1968 to 2024, 1998, every candidate Candidate Party Votes and share Share DemocraticEllen M. CorbettWon Democratic 63,49165.8% RepublicanCarol Nowicki Republican 33,06034.2% - Votes for listed candidates
- 89,122
- Election day
- November 5, 1996
- District map
- Older district map (1992 to 2001)
California Assembly District 18, 1968 to 2024, 1996, every candidate Candidate Party Votes and share Share DemocraticMichael SweeneyWon(incumbent) Democratic 89,122100.0% - Votes for listed candidates
- 100,173
- Election day
- November 8, 1994
- District map
- Older district map (1992 to 2001)
California Assembly District 18, 1968 to 2024, 1994, every candidate Candidate Party Votes and share Share DemocraticMichael SweeneyWon Democratic 69,86369.7% RepublicanDon J. Grundmann Republican 30,31030.3% - Votes for listed candidates
- 135,295
- Election day
- November 3, 1992
- District map
- Older district map (1992 to 2001)
California Assembly District 18, 1968 to 2024, 1992, every candidate Candidate Party Votes and share Share DemocraticJohan KlehsWon(incumbent) Democratic 87,97165.0% RepublicanDon J. Grundmann Republican 38,02728.1% LibertarianTerry L. Floyd Libertarian 9,2976.9% - Votes for listed candidates
- 65,654
- Election day
- November 6, 1990
- District map
- Older district map (1984 to 1991)
California Assembly District 18, 1968 to 2024, 1990, every candidate Candidate Party Votes and share Share DemocraticDelaine EastinWon(incumbent) Democratic 65,654100.0% - Votes for listed candidates
- 112,287
- Election day
- November 8, 1988
- District map
- Older district map (1984 to 1991)
California Assembly District 18, 1968 to 2024, 1988, every candidate Candidate Party Votes and share Share DemocraticDelaine EastinWon(incumbent) Democratic 75,61067.3% RepublicanTom Curry Republican 36,67732.7% - Votes for listed candidates
- 76,506
- Election day
- November 4, 1986
- District map
- Older district map (1984 to 1991)
California Assembly District 18, 1968 to 2024, 1986, every candidate Candidate Party Votes and share Share DemocraticDelaine EastinWon Democratic 43,24156.5% RepublicanMartin Mehan Republican 31,06840.6% LibertarianCharles F. Hanes Libertarian 2,1972.9% - Votes for listed candidates
- 102,279
- Election day
- November 6, 1984
- District map
- Older district map (1984 to 1991)
California Assembly District 18, 1968 to 2024, 1984, every candidate Candidate Party Votes and share Share DemocraticAlister McAlisterWon(incumbent) Democratic 64,86663.4% RepublicanMartin Mehan Republican 32,92032.2% LibertarianJohn H. Webster Libertarian 4,4934.4% - Votes for listed candidates
- 77,598
- Election day
- November 2, 1982
- District map
- Older district map (1982 to 1983)
California Assembly District 18, 1968 to 2024, 1982, every candidate Candidate Party Votes and share Share DemocraticAlister McAlisterWon(incumbent) Democratic 51,56566.5% RepublicanMike Thompson Republican 22,58929.1% LibertarianJohn H. Webster Libertarian 3,4444.4% - Votes for listed candidates
- 86,147
- Election day
- November 4, 1980
- District map
- Older district map (1974 to 1981)
California Assembly District 18, 1968 to 2024, 1980, every candidate Candidate Party Votes and share Share DemocraticLeo T. McCarthyWon(incumbent) Democratic 63,87274.1% RepublicanTom Gede Republican 18,73321.8% LibertarianMark Pickens Libertarian 3,5424.1% - Votes for listed candidates
- 68,947
- Election day
- November 7, 1978
- District map
- Older district map (1974 to 1981)
California Assembly District 18, 1968 to 2024, 1978, every candidate Candidate Party Votes and share Share DemocraticLeo T. McCarthyWon(incumbent) Democratic 47,68569.2% RepublicanJoseph C. Faulkner Republican 18,12026.3% OtherPatrick A. Walters Other 3,1424.6% - Votes for listed candidates
- 78,136
- Election day
- November 2, 1976
- District map
- Older district map (1974 to 1981)
California Assembly District 18, 1968 to 2024, 1976, every candidate Candidate Party Votes and share Share DemocraticLeo T. McCarthyWon(incumbent) Democratic 54,66170.0% RepublicanJohn W. Meyer Republican 23,47530.0% - Votes for listed candidates
- 74,410
- Election day
- November 4, 1974
- District map
- Older district map (1974 to 1981)
California Assembly District 18, 1968 to 2024, 1974, every candidate Candidate Party Votes and share Share DemocraticLeo T. McCarthyWon(incumbent) Democratic 56,77976.3% RepublicanTerence Faulkner Republican 17,63123.7% - Votes for listed candidates
- 62,634
- Election day
- November 7, 1972
- District map
- Older district map (1966 to 1973)
California Assembly District 18, 1968 to 2024, 1972, every candidate Candidate Party Votes and share Share DemocraticWillie L. BrownWon(incumbent) Democratic 47,64576.1% RepublicanJoan L. Irwin Republican 14,98923.9% - Votes for listed candidates
- 48,613
- Election day
- November 3, 1970
- District map
- Older district map (1966 to 1973)
California Assembly District 18, 1968 to 2024, 1970, every candidate Candidate Party Votes and share Share DemocraticWillie L. BrownWon(incumbent) Democratic 32,44666.7% RepublicanFrank J. Pagliaro Jr. Republican 16,16733.3% - Votes for listed candidates
- 59,695
- Election day
- November 5, 1968
- District map
- Older district map (1966 to 1973)
California Assembly District 18, 1968 to 2024, 1968, every candidate Candidate Party Votes and share Share DemocraticWillie L. BrownWon(incumbent) Democratic 38,68164.8% RepublicanJames L. Walker Republican 17,09128.6% OtherKathleen N. Cleaver Other 2,7784.7% OtherDallas F. Givens Other 1,1451.9%
- 2024: California Secretary of State, Statement of Vote, Nov 5 2024 general (summary pages), retrieved Oct 28, 2026
More about this race
Source: elections.cdn.sos.ca.gov (PDF), dated Aug 27
District map
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- Democratic
- Republican
- Independent
- Nonpartisan
- More than one party
- No member listed
Map settings
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Official results for California
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Cite this page
Election Wrld. (2026). California Assembly District 18, election results 1968 to 2024. https://www.electionwrld.com/ca/assembly/18. Retrieved October 31, 2026.
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Sources
Sources: Census TIGERweb Legislative MapServer (120th CDs layer 0, 119th CDs layer 4, 2026 SLD upper layer 1 and lower layer 2) (US Census Bureau, public domain), retrieved Oct 28, 2026; Open Civic Data division identifiers (census_autogenerated us_sldl/us_sldu and openstates state files); also (sld-recent.json): Open Civic Data division identifiers (country-us) (CC0 (repository); also (sld-recent.json): CC0 1.0), retrieved Oct 28, 2026; Open States people (current) CSVs (CC0-1.0 (Open States people data)), retrieved Oct 28, 2026, compiled by Open States volunteers and staff (rosters from state legislature sites) from official returns, not an official source; California Secretary of State, Statement of Vote, Nov 5 2024 general (summary pages) (US state public record), retrieved Oct 28, 2026; State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse) (CC0 1.0), retrieved Oct 28, 2026, compiled by Carl Klarner (Harvard Dataverse) from official returns, not an official source.
DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), DIME (ODC-BY), California Secretary of State, Statement of Vote, Nov 5 2024 generalData as of Oct 28, 2026