House districts / California
California's 31st congressional district
CA-31. Redrawn for 2026: the November 2026 election is on new lines. The outline shows the 2024 district with the same number.
Fundraising
- Gilbert Cisneros Das of Oct 14, 2026Raised $853kSpent $680k · Cash $213k
- Eric J Ching Ras of Oct 14, 2026Raised $97kSpent $127k · Cash $10k
1 other candidate has 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 53.4% | Trump 43.6% | 3.0% | D+9.8 | D+16.9 |
| 2020 | Biden 61.5% | Trump 36.4% | 2.1% | D+25.1 | D+31.1 |
| 2016 | Clinton 61.5% | Trump 32.8% | 5.8% | D+28.7 | D+37.1 |
Who lives here
| Measure | This district | US |
|---|---|---|
| People | ||
| Population | 758,733 | |
| Adults (18+) | 599,214 | |
| Citizens, % of adults* | 85.5% | 92.1% |
| Age, % of adults | ||
| 18 to 29* | 20.6% | 20.3% |
| 30 to 44* | 25.9% | 25.9% |
| 45 to 64* | 32.9% | 31.8% |
| 65 and over* | 20.6% | 22.0% |
| Race and Hispanic origin, % of residents | ||
| White | 18.8% | 57.8% |
| Black | 3.2% | 12.1% |
| Hispanic | 56.4% | 18.7% |
| Asian | 18.5% | 5.9% |
| Other or more than one | 3.1% | 5.5% |
| Education and income | ||
| Bachelor's degree or higher, % of 25+* | 29.2% | 35.7% |
| Median household income* | $98,715 | $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 | Gil Cisneros Democrat | 59.7% | Daniel Jose Bocic Martinez Republican | 40.3% | D+19.5 |
| 2022 | Grace F. Napolitano Democrat | 59.5% | Daniel Bocic Martinez Republican | 40.5% | D+19.1 |
| Earlier lines, elections 2012-2020 post-census redistricting | |||||
| 2020 | Pete Aguilar Democrat | 61.3% | Agnes Gibboney Republican | 38.7% | D+22.6 |
| 2018 | Pete Aguilar Democrat | 58.7% | Sean Flynn Republican | 41.3% | D+17.5 |
| 2016 | Pete Aguilar Democrat | 56.1% | Paul Chabot Republican | 43.9% | D+12.1 |
| 2014 | Pete Aguilar Democrat | 51.7% | Paul Chabot Republican | 48.3% | D+3.5 |
| 2012 | Gary G. Miller Republican | 55.2% | Bob Dutton Republican | 44.8% | R+10.4 |
| Earlier lines, elections 2002-2010 seat count changed from 52 to 53 after the census | |||||
| 2010 | Xavier Becerra Democrat | 83.8% | Stephen C. Smith Republican | 16.2% | D+67.6 |
| 2008 | Xavier Becerra Democrat | 100.0% | D+100.0 | ||
| 2006 | Xavier Becerra Democrat | 100.0% | D+100.0 | ||
| 2004 | Xavier Becerra Democrat | 80.2% | Luis Vega Republican | 19.8% | D+60.4 |
| 2002 | Xavier Becerra Democrat | 81.2% | Luis Vega Republican | 18.9% | D+62.3 |
| Earlier lines, elections 1992-2000 seat count changed from 45 to 52 after the census | |||||
| 2000 | Hilda L. Solis Democrat | 79.3% | Krista Lieberg-Wong Green others 11.5% | 9.1% | D+70.2 |
| 1998 | Matthew G. Martinez Democrat | 70.0% | Frank C. Moreno Republican others 7.3% | 22.6% | D+47.4 |
| 1996 | Matthew G. Martinez Democrat | 67.5% | John V. Flores Republican others 4.6% | 27.9% | D+39.5 |
| 1994 | Matthew G. Martinez Democrat | 59.1% | John V. Flores Republican | 40.9% | D+18.3 |
| 1992 | Matthew G. Martinez Democrat | 62.6% | Reuben D. Franco Republican | 37.4% | D+25.1 |
| Earlier lines, elections 1982-1990 seat count changed from 43 to 45 after the census | |||||
| 1990 | Mervyn M. Dymally Democrat | 67.2% | Eunice N. Sato Republican | 32.9% | D+34.3 |
| 1988 | Mervyn M. Dymally Democrat | 71.6% | Arnold C. May Republican others 2.9% | 25.5% | D+46.0 |
| 1986 | Mervyn M. Dymally Democrat | 70.2% | Jack McMurray Republican others 2.1% | 27.6% | D+42.6 |
| 1984 | Mervyn M. Dymally Democrat | 70.7% | Henry C. Minturn Republican | 29.3% | D+41.4 |
| 1982 | Mervyn M. Dymally Democrat | 72.4% | Henry C. Minturn Republican | 27.6% | D+44.8 |
| Earlier lines, elections 1976-1980 | |||||
| 1980 | Mervyn M. Dymally Democrat | 64.4% | Don Grimshaw Republican | 35.6% | D+28.8 |
| 1978 | Charles H. Wilson Democrat | 67.8% | Don Grimshaw Republican | 32.2% | D+35.5 |
| 1976 | Charles II. Wilson Democrat | 100.0% | D+100.0 | ||
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-31 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