- Lead
- 62,224
- Total
- 206,425
- vs nation
- D+31.6
California 4th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 79,296
- Total
- 222,589
- vs nation
- D+31.2
- Lead
- 63,112
- Total
- 189,234
- vs nation
- D+31.3
- Lead
- 51,048
- Total
- 174,633
- vs nation
- D+25.4
- Lead
- 59,649
- Total
- 185,802
- vs nation
- D+24.8
- Lead
- 31,877
- Total
- 173,477
- vs nation
- D+20.8
- Lead
- 22,101
- Total
- 151,761
- vs nation
- D+14.0
- Lead
- 26,708
- Total
- 144,365
- vs nation
- D+10.0
Key facts
- 2024 presidential margin
- D+30.1MIT Election Lab
- Population
- 474,3272024 5-year
- Population density
- 113 / sq mi2024 5-year · TIGER/Line
- Land area
- 4,197 sq miTIGER/Line
- Median household income
- $91,1672024 5-year
- White (non-Hispanic)
- 29.0%2024 5-year
- Black
- 0.8%2024 5-year
- Hispanic / Latino
- 18.6%2024 5-year
- Peak Democratic margin
- D+52.8 in 1912MIT Election Lab
- Peak Republican margin
- R+36.0 in 1924MIT Election Lab
- Most similar
- Assembly District 6, CA · twin score 94.1
presidential history
Party record book
California 4th 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
Joe Biden2020
66.6%
148,329 votes · D+35.6 · modeled estimate
Runner-up · Barack Obama, 2008 · 64.9%
Republican
Warren G. Harding1920
64.8%
11,074 votes · R+35.6 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · 59.1%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
148,329votes
66.6% of the vote · D+35.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 131,573 votes
Republican
Ronald Reagan1984
69,372votes
53.1% of the vote · R+7.6 · modeled estimate
Runner-up · Donald Trump, 2024 · 69,349 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
+33.2pts D vs U.S.
Place D+52.8 · U.S. D+19.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · +31.6 pts
Republican
Calvin Coolidge1924
+10.8pts R vs U.S.
Place R+36.0 · U.S. R+25.2 · modeled estimate
Runner-up · Warren G. Harding, 1920 · +9.5 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.
Assembly District 4 delivered one of California's more decisive presidential margins in 2024, reflecting a densely populated constituency that has leaned strongly toward Democratic candidates across multiple cycles.
Across the recorded series it reached a Democratic high of 52.8 points in 1912 and a Republican high of 36.0 points in 1924. Between 2020 and 2024 the district moved 5.5 points toward the Republican candidate; the 2024 margin was 30.1 points.
A population of 474,327, a 29% non-Hispanic-white share, and a median household income of $91,167 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 6 and Assembly District 15.
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 4th State House District. Akashic. https://akashic.app/sld-lower/06004/. Accessed May 20, 2026. License: CC BY 4.0.