- Lead
- 121,967
- Total
- 234,465
- vs nation
- D+53.5
California 51st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 147,983
- Total
- 259,164
- vs nation
- D+52.6
- Lead
- 140,967
- Total
- 220,411
- vs nation
- D+61.9
- Lead
- 118,025
- Total
- 200,874
- vs nation
- D+54.9
- Lead
- 120,707
- Total
- 208,337
- vs nation
- D+50.7
- Lead
- 87,826
- Total
- 184,860
- vs nation
- D+50.0
- Lead
- 82,793
- Total
- 165,877
- vs nation
- D+49.4
- Lead
- 68,417
- Total
- 147,891
- vs nation
- D+37.7
Key facts
- 2024 presidential margin
- D+52.0MIT Election Lab
- Population
- 496,2322024 5-year
- Population density
- 8,798 / sq mi2024 5-year · TIGER/Line
- Land area
- 56.4 sq miTIGER/Line
- Median household income
- $95,7672024 5-year
- White (non-Hispanic)
- 58.7%2024 5-year
- Black
- 4.1%2024 5-year
- Hispanic / Latino
- 17.5%2024 5-year
- Peak Democratic margin
- D+69.8 in 1876MIT Election Lab
- Peak Republican margin
- R+47.2 in 1924MIT Election Lab
- Most similar
- Assembly District 44, CA · twin score 96.9
presidential history
Party record book
California 51st 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
Samuel J. Tilden1876
84.8%
396 votes · D+69.8 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 79.3%
Republican
Warren G. Harding1920
59.9%
7,876 votes · R+29.8 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 58.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
201,364votes
77.7% of the vote · D+57.1 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 174,771 votes
Republican
Richard Nixon1972
67,994votes
43.2% of the vote · D+10.4 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 62,502 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
Hillary Clinton2016
+61.9pts D vs U.S.
Place D+64.0 · U.S. D+2.1 · modeled estimate
Runner-up · Barack Obama, 2012 · +54.9 pts
Republican
Calvin Coolidge1924
+22.1pts R vs U.S.
Place R+47.2 · U.S. R+25.2 · modeled estimate
Runner-up · Warren G. Harding, 1920 · +3.6 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 51 has returned Democratic presidential margins above 20 points in recent cycles, reflecting a heavily Latino and Asian-American electorate spread across working-class suburbs east of Los Angeles.
Across the recorded series it reached a Democratic high of 69.8 points in 1876 and a Republican high of 47.2 points in 1924. Between 2020 and 2024 the district moved 5.1 points toward the Republican candidate; the 2024 margin was 52.0 points.
A population of 496,232, a 59% non-Hispanic-white share, and a median household income of $95,767 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 44 and Assembly District 14.
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 51st State House District. Akashic. https://akashic.app/sld-lower/06051/. Accessed May 20, 2026. License: CC BY 4.0.