- Lead
- 67,617
- Total
- 249,354
- vs nation
- D+28.6
California 30th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 80,848
- Total
- 267,781
- vs nation
- D+25.7
- Lead
- 57,438
- Total
- 227,785
- vs nation
- D+23.1
- Lead
- 42,721
- Total
- 209,324
- vs nation
- D+16.6
- Lead
- 52,032
- Total
- 221,395
- vs nation
- D+16.2
- Lead
- 21,894
- Total
- 213,965
- vs nation
- D+12.7
- Lead
- 10,529
- Total
- 188,219
- vs nation
- D+5.1
- Lead
- 11,165
- Total
- 174,673
- vs nation
- R+2.1
Key facts
- 2024 presidential margin
- D+27.1MIT Election Lab
- Population
- 476,7122024 5-year
- Population density
- 90 / sq mi2024 5-year · TIGER/Line
- Land area
- 5,313 sq miTIGER/Line
- Median household income
- $102,2342024 5-year
- White (non-Hispanic)
- 62.3%2024 5-year
- Black
- 1.9%2024 5-year
- Hispanic / Latino
- 23.8%2024 5-year
- Peak Democratic margin
- D+42.9 in 1912MIT Election Lab
- Peak Republican margin
- R+45.8 in 1924MIT Election Lab
- Most similar
- Assembly District 4, CA · twin score 86.9
presidential history
Party record book
California 30th 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
63.9%
171,069 votes · D+30.2 · modeled estimate
Runner-up · Kamala Harris, 2024 · 62.0%
Republican
Warren G. Harding1920
65.1%
7,770 votes · R+41.7 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · 65.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
171,069votes
63.9% of the vote · D+30.2 · modeled estimate
Runner-up · Kamala Harris, 2024 · 154,500 votes
Republican
George W. Bush2004
94,194votes
44.0% of the vote · D+10.2 · modeled estimate
Runner-up · Donald Trump, 2020 · 90,221 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
+28.6pts D vs U.S.
Place D+27.1 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +25.7 pts
Republican
Calvin Coolidge1924
+20.6pts R vs U.S.
Place R+45.8 · U.S. R+25.2 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · +20.0 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.
Anchored in the western San Gabriel Valley, AD-30 has delivered double-digit Democratic presidential margins for more than a decade, reflecting a diverse, densely populated suburban electorate that trends heavily toward the party in statewide contests.
Across the recorded series it reached a Democratic high of 42.9 points in 1912 and a Republican high of 45.8 points in 1924. Between 2020 and 2024 the district moved 3.1 points toward the Republican candidate; the 2024 margin was 27.1 points.
A population of 476,712, a 62% non-Hispanic-white share, and a median household income of $102,234 describe the district. The district's voting pattern over the last decade is most similar to that of Assembly District 4 and Assembly District 12.
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 30th State House District. Akashic. https://akashic.app/sld-lower/06030/. Accessed May 20, 2026. License: CC BY 4.0.