- Lead
- 104,496
- Total
- 237,999
- vs nation
- D+45.4
California 28th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 124,368
- Total
- 260,611
- vs nation
- D+43.3
- Lead
- 102,599
- Total
- 227,697
- vs nation
- D+43.0
- Lead
- 78,129
- Total
- 211,012
- vs nation
- D+33.2
- Lead
- 79,693
- Total
- 220,132
- vs nation
- D+28.9
- Lead
- 50,863
- Total
- 205,604
- vs nation
- D+27.2
- Lead
- 34,400
- Total
- 186,370
- vs nation
- D+17.9
- Lead
- 29,644
- Total
- 178,701
- vs nation
- D+8.1
Key facts
- 2024 presidential margin
- D+43.9MIT Election Lab
- Population
- 472,2702024 5-year
- Population density
- 818 / sq mi2024 5-year · TIGER/Line
- Land area
- 577 sq miTIGER/Line
- Median household income
- $163,3892024 5-year
- White (non-Hispanic)
- 52.4%2024 5-year
- Black
- 1.9%2024 5-year
- Hispanic / Latino
- 21.1%2024 5-year
- Peak Democratic margin
- D+47.7 in 2020MIT Election Lab
- Peak Republican margin
- R+54.4 in 1924MIT Election Lab
- Most similar
- Assembly District 21, CA · twin score 97.2
presidential history
Party record book
California 28th 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
72.6%
189,226 votes · D+47.7 · modeled estimate
Runner-up · Kamala Harris, 2024 · 70.0%
Republican
Warren G. Harding1920
69.7%
8,265 votes · R+49.7 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 69.3%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
189,226votes
72.6% of the vote · D+47.7 · modeled estimate
Runner-up · Kamala Harris, 2024 · 166,700 votes
Republican
Ronald Reagan1984
104,063votes
57.7% of the vote · R+17.1 · modeled estimate
Runner-up · George H. W. Bush, 1988 · 92,199 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
Kamala Harris2024
+45.4pts D vs U.S.
Place D+43.9 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +43.3 pts
Republican
Calvin Coolidge1924
+29.2pts R vs U.S.
Place R+54.4 · U.S. R+25.2 · modeled estimate
Runner-up · Thomas E. Dewey, 1948 · +28.0 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.
With a 2024 presidential margin of D+43.9, Assembly District 28 ranks among the state's most reliably one-sided legislative districts, leaving general-election outcomes largely settled before ballots are cast.
Across the recorded series it reached a Democratic high of 47.7 points in 2020 and a Republican high of 54.4 points in 1924. Between 2020 and 2024 the district moved 3.8 points toward the Republican candidate; the 2024 margin was 43.9 points.
A population of 472,270, a 52% non-Hispanic-white share, and a median household income of $163,389 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 21 and Assembly District 23.
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 28th State House District. Akashic. https://akashic.app/sld-lower/06028/. Accessed May 20, 2026. License: CC BY 4.0.