House districts / California
California's 10th congressional district
CA-10. Redrawn for 2026: the November 2026 election is on new lines. The outline shows the 2024 district with the same number.
Fundraising
- Mark Desaulnier Das of Oct 14, 2026Raised $722kSpent $884k · Cash $467k
4 other 2026 candidates filed reports (primary candidates). 2 other candidates have not filed.
Federal Election Commission, candidate totals, public domain.
President in this district
PollCheck calculation from precinct returns on the 2026 lines (method).
| Year | Democrat | Republican | Other | Margin | 2024 lines |
|---|---|---|---|---|---|
| 2024 | Harris 64.7% | Trump 31.9% | 3.4% | D+32.8 | D+33.8 |
| 2020 | Biden 68.2% | Trump 29.6% | 2.2% | D+38.6 | D+39.4 |
| 2016 | Clinton 64.8% | Trump 29.1% | 6.1% | D+35.7 | D+36.2 |
Who lives here
| Measure | This district | US |
|---|---|---|
| People | ||
| Population | 759,118 | |
| Adults (18+) | 588,180 | |
| Citizens, % of adults* | 89.1% | 92.1% |
| Age, % of adults | ||
| 18 to 29* | 15.6% | 20.3% |
| 30 to 44* | 25.7% | 25.9% |
| 45 to 64* | 35.3% | 31.8% |
| 65 and over* | 23.3% | 22.0% |
| Race and Hispanic origin, % of residents | ||
| White | 49.3% | 57.8% |
| Black | 3.8% | 12.1% |
| Hispanic | 19.9% | 18.7% |
| Asian | 19.9% | 5.9% |
| Other or more than one | 7.2% | 5.5% |
| Education and income | ||
| Bachelor's degree or higher, % of 25+* | 53.2% | 35.7% |
| Median household income* | $146,876 | $80,734 |
* Estimated for the 2026 lines from census blocks (ACS 2020-2024). Population, adults and race: 2020 Census, counted on the 2026 lines. The tick marks the US figure.
Winning margin
Results since 1976
| Year | Winner | Share | Runner-up | Share | Margin |
|---|---|---|---|---|---|
| 2024 lines, elections 2022-2024: redrawn for 2026 seat count changed from 53 to 52 after the census | |||||
| 2024 | Mark DeSaulnier Democrat | 66.5% | Katherine Piccinini Republican | 33.5% | D+32.9 |
| 2022 | Mark DeSaulnier Democrat | 78.9% | Michael Ernest Kerr Green | 21.1% | D+57.9 |
| Earlier lines, elections 2012-2020 post-census redistricting | |||||
| 2020 | Josh Harder Democrat | 55.2% | Ted Howze Republican | 44.8% | D+10.3 |
| 2018 | Josh Harder Democrat | 52.2% | Jeff Denham Republican | 47.8% | D+4.5 |
| 2016 | Jeff Denham Republican | 51.7% | Michael Eggman Democrat | 48.3% | R+3.4 |
| 2014 | Jeff Denhem Republican | 56.1% | Michael Eggman Democrat | 43.9% | R+12.3 |
| 2012 | Jeff Denham Republican | 52.7% | Jose Hernandez Democrat | 47.3% | R+5.4 |
| Earlier lines, elections 2002-2010 seat count changed from 52 to 53 after the census | |||||
| 2010 | John Garamendi Democrat | 58.8% | Gary Clift Republican others 3.3% | 37.9% | D+21.0 |
| 2008 | Ellen O. Tauscher Democrat | 65.1% | Nicholas Gerber Republican others 3.8% | 31.1% | D+34.0 |
| 2006 | Ellen O. Tauscher Democrat | 66.4% | Darcy Linn Republican | 33.5% | D+32.9 |
| 2004 | Ellen O. Tauscher Democrat | 65.7% | Jeff Ketelson Republican | 34.3% | D+31.4 |
| 2002 | Ellen O. Tauscher Democrat | 75.6% | Sonia Esther Harden Libertarian | 24.4% | D+51.2 |
| Earlier lines, elections 1992-2000 seat count changed from 45 to 52 after the census | |||||
| 2000 | Ellen O. Tauscher Democrat | 52.6% | Claude B. Hutchison, Jr. Republican others 3.1% | 44.2% | D+8.4 |
| 1998 | Ellen O. Tauscher Democrat | 53.5% | Charles Ball Republican others 3.1% | 43.4% | D+10.0 |
| 1996 | Ellen O. Tauscher Democrat | 48.6% | Bill Baker Republican others 4.2% | 47.2% | D+1.4 |
| 1994 | Bill Baker Republican | 59.3% | Ellen Schwartz Democrat others 2.0% | 38.6% | R+20.6 |
| 1992 | Bill Baker Republican | 52.0% | Wendell H. Williams Democrat | 48.0% | R+4.0 |
| Earlier lines, elections 1982-1990 seat count changed from 43 to 45 after the census | |||||
| 1990 | Don Edwards Democrat | 62.7% | Mark Patrosso Republican | 37.3% | D+25.4 |
| 1988 | Don Edwards Democrat | 86.2% | Kennita Watson Libertarian | 13.8% | D+72.4 |
| 1986 | Don Edwards Democrat | 70.5% | Michael R. La Crone Republican others 2.9% | 26.6% | D+43.8 |
| 1984 | Don Edwards Democrat | 62.4% | Robert P. Herriot Republican others 3.3% | 34.3% | D+28.1 |
| 1982 | Don Edwards Democrat | 62.7% | Bob Herriott Republican others 3.7% | 33.7% | D+29.0 |
| Earlier lines, elections 1976-1980 | |||||
| 1980 | Don Edwards Democrat | 62.1% | John M. Lutton Republican others 9.9% | 27.9% | D+34.2 |
| 1978 | Don Edwards Democrat | 67.1% | Rudy Hansen Republican | 32.9% | D+34.3 |
| 1976 | Don Edwards Democrat | 72.0% | Herb Smith Republican others 3.5% | 24.5% | D+47.5 |
More on California
Other California districts
About these results
Shares count all candidate votes, including write-ins, with a candidate's votes on several party lines added together. Each result is on the lines in force at the time. Mid-decade redraws before 2016 may be unmarked.
President in this district: 2016 and 2020, and 2024 on the new lines, are estimates: precinct votes are split between districts by census block. The last column is the margin in CA-10 on the 2024 lines.
Counties only partly inside the district show the 2024 result for that part; estimates are labelled.
Margin chart: winner minus runner-up. Gaps are unopposed races; dashed lines are new district lines.
Who lives here (2026 lines) is estimated from Census survey figures split by population.
Sources
Results: MIT Election Data and Science Lab, U.S. House 1976-2016 (doi:10.7910/DVN/IG0UN2, CC0; via MEDSL/constituency-returns), and Clerk of the US House, Statistics of the Presidential and Congressional Election 2018-2024 (public domain).
Presidential results: PollCheck calculation from MIT Election Data and Science Lab 2024 precinct returns (doi:10.7910/DVN/XDJYKC, doi:10.7910/DVN/USBYR4, CC0; state totals doi:10.7910/DVN/42MVDX, CC0) and Voting and Election Science Team 2016 and 2020 precinct results and shapes (doi:10.7910/DVN/NH5S2I, doi:10.7910/DVN/K7760H, CC BY 4.0), with US Census Bureau 2020 block populations and block equivalency files (public domain). Official figures: Texas Legislative Council (2024 on the 2026 lines); Louisiana, New Jersey, California and Washington election offices (county totals). Certified results transcribed by Wikipedia (CC BY-SA 4.0): Maine 2024 by district: 2024 United States presidential election in Maine (revision 1382530995); Indiana county totals: 2024 United States presidential election in Indiana (revision 1382505975); Oregon county totals: 2024 United States presidential election in Oregon (revision 1382605746).
District lines: US Census Bureau TIGER/Line 2026 (120th Congress) and 2025 cartographic boundary files (119th Congress), public domain.
Members: unitedstates/congress-legislators (CC0).
Counties: US Census Bureau 2024 cartographic boundary file (public domain); 2024 county results summed from the same MEDSL precinct returns, with the official county totals above.
Demographics: US Census Bureau, American Community Survey 5-year estimates 2020-2024; 2020 Census P.L. 94-171 (public domain).
2028 candidates: Federal Election Commission (public domain).
Photos: official portraits, public domain (US government); see Photo credits.
PollCheck US. Data through November 5, 2026. Photo credits