- Lead
- 129,869
- Total
- 208,690
- vs nation
- D+63.7
California 55th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 166,090
- Total
- 237,179
- vs nation
- D+65.6
- Lead
- 150,263
- Total
- 200,206
- vs nation
- D+73.0
- Lead
- 130,055
- Total
- 180,550
- vs nation
- D+68.2
- Lead
- 133,608
- Total
- 186,759
- vs nation
- D+64.3
- Lead
- 103,760
- Total
- 162,054
- vs nation
- D+66.5
- Lead
- 95,594
- Total
- 146,206
- vs nation
- D+64.9
- Lead
- 79,230
- Total
- 130,153
- vs nation
- D+52.4
Key facts
- 2024 presidential margin
- D+62.2MIT Election Lab
- Population
- 474,2852024 5-year
- Population density
- 11,977 / sq mi2024 5-year · TIGER/Line
- Land area
- 39.6 sq miTIGER/Line
- Median household income
- $93,5582024 5-year
- White (non-Hispanic)
- 29.8%2024 5-year
- Black
- 19.7%2024 5-year
- Hispanic / Latino
- 33.9%2024 5-year
- Peak Democratic margin
- D+83.0 in 1876MIT Election Lab
- Peak Republican margin
- R+31.1 in 1924MIT Election Lab
- Most similar
- Assembly District 61, CA · twin score 97.9
presidential history
Party record book
California 55th 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
91.4%
317 votes · D+83.0 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 85.0%
Republican
Warren G. Harding1920
47.8%
4,821 votes · R+8.0 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 46.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
199,474votes
84.1% of the vote · D+70.0 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 170,221 votes
Republican
Richard Nixon1972
40,095votes
31.6% of the vote · D+33.2 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 37,087 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
+73.0pts D vs U.S.
Place D+75.1 · U.S. D+2.1 · modeled estimate
Runner-up · Barack Obama, 2012 · +68.2 pts
Republican
Calvin Coolidge1924
+5.9pts R vs U.S.
Place R+31.1 · U.S. R+25.2 · modeled estimate
Runner-up · Warren G. Harding, 1920 · −18.2 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.
Assembly District 55 posts presidential margins exceeding 34 points, reflecting a densely populated, majority-minority urban constituency where Democratic candidates have faced little meaningful general-election competition in recent cycles.
Across the recorded series it reached a Democratic high of 83.0 points in 1876 and a Republican high of 31.1 points in 1924. Between 2020 and 2024 the district moved 7.8 points toward the Republican candidate; the 2024 margin was 62.2 points.
A population of 474,285, a 30% non-Hispanic-white share, and a median household income of $93,558 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 61 and Assembly District 18.
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 55th State House District. Akashic. https://akashic.app/sld-lower/06055/. Accessed May 20, 2026. License: CC BY 4.0.