- Lead
- 42,767
- Total
- 265,841
- vs nation
- R+14.6
California 1st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 35,452
- Total
- 280,423
- vs nation
- R+17.1
- Lead
- 43,592
- Total
- 239,219
- vs nation
- R+20.3
- Lead
- 37,588
- Total
- 227,870
- vs nation
- R+20.4
- Lead
- 27,650
- Total
- 242,472
- vs nation
- R+18.7
- Lead
- 54,796
- Total
- 232,422
- vs nation
- R+21.1
- Lead
- 51,614
- Total
- 202,930
- vs nation
- R+26.0
- Lead
- 27,578
- Total
- 187,388
- vs nation
- R+23.2
Key facts
- 2024 presidential margin
- R+16.1MIT Election Lab
- Population
- 512,2752024 5-year
- Population density
- 19 / sq mi2024 5-year · TIGER/Line
- Land area
- 26,449 sq miTIGER/Line
- Median household income
- $77,7302024 5-year
- White (non-Hispanic)
- 75.3%2024 5-year
- Black
- 1.1%2024 5-year
- Hispanic / Latino
- 12.7%2024 5-year
- Peak Democratic margin
- D+47.9 in 1912MIT Election Lab
- Peak Republican margin
- R+34.0 in 1920MIT Election Lab
- Most similar
- State House District 32, FL · twin score 82.0
presidential history
Party record book
California 1st State House District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1936
73.0%
31,212 votes · D+47.2 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 70.4%
Republican
Warren G. Harding1920
63.0%
12,701 votes · R+34.0 · modeled estimate
Runner-up · George W. Bush, 2004 · 61.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
119,204votes
42.5% of the vote · R+12.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 107,636 votes
Republican
Donald Trump2020
154,656votes
55.2% of the vote · R+12.6 · modeled estimate
Runner-up · Donald Trump, 2024 · 150,403 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Woodrow Wilson1912
+28.3pts D vs U.S.
Place D+47.9 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · +26.3 pts
Republican
George W. Bush2000
+26.0pts R vs U.S.
Place R+25.4 · U.S. D+0.5 · modeled estimate
Runner-up · Bob Dole, 1996 · +23.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Anchored in the North Coast and parts of the Bay Area, Assembly District 1 has recorded presidential margins exceeding 50 points Democratic, reflecting a highly educated, environmentally oriented electorate with relatively low population density outside urban cores.
Across the recorded series it reached a Democratic high of 47.9 points in 1912 and a Republican high of 34.0 points in 1920. Between 2020 and 2024 the district moved 3.4 points toward the Republican candidate; the 2024 margin was 16.1 points.
A population of 512,275, a 75% non-Hispanic-white share, and a median household income of $77,730 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 32 and Assembly District 5.
The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
California 1st State House District. Akashic. https://akashic.app/sld-lower/06001/. Accessed May 20, 2026. License: CC BY 4.0.