- Lead
- 142,361
- Total
- 257,595
- vs nation
- D+56.7
California 12th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 162,210
- Total
- 272,995
- vs nation
- D+55.0
- Lead
- 132,568
- Total
- 240,451
- vs nation
- D+53.0
- Lead
- 110,317
- Total
- 227,823
- vs nation
- D+44.6
- Lead
- 128,510
- Total
- 238,801
- vs nation
- D+46.5
- Lead
- 97,792
- Total
- 230,036
- vs nation
- D+45.0
- Lead
- 66,184
- Total
- 207,691
- vs nation
- D+31.3
- Lead
- 53,995
- Total
- 193,920
- vs nation
- D+19.3
Key facts
- 2024 presidential margin
- D+55.3MIT Election Lab
- Population
- 486,1422024 5-year
- Population density
- 534 / sq mi2024 5-year · TIGER/Line
- Land area
- 911 sq miTIGER/Line
- Median household income
- $122,4182024 5-year
- White (non-Hispanic)
- 61.6%2024 5-year
- Black
- 2.0%2024 5-year
- Hispanic / Latino
- 23.9%2024 5-year
- Peak Democratic margin
- D+59.4 in 2020MIT Election Lab
- Peak Republican margin
- R+46.7 in 1924MIT Election Lab
- Most similar
- State House District 8, CO · twin score 89.7
presidential history
Party record book
California 12th 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
78.7%
214,733 votes · D+59.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 76.1%
Republican
Warren G. Harding1920
68.2%
9,953 votes · R+44.5 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · 66.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
214,733votes
78.7% of the vote · D+59.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 196,111 votes
Republican
Ronald Reagan1984
90,388votes
50.0% of the vote · R+1.4 · modeled estimate
Runner-up · Richard Nixon, 1972 · 79,432 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
+56.7pts D vs U.S.
Place D+55.3 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +55.0 pts
Republican
William H. Taft1908
+24.4pts R vs U.S.
Place R+34.0 · U.S. R+9.6 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · +23.7 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 12 recorded a D+55.3 presidential margin in 2024, placing it among the most heavily one-sided state house seats in California. Its composition likely reflects dense urban precincts where partisan lean is reinforced by high population concentration.
Across the recorded series it reached a Democratic high of 59.4 points in 2020 and a Republican high of 46.7 points in 1924. Between 2020 and 2024 the district moved 4.2 points toward the Republican candidate; the 2024 margin was 55.3 points.
A population of 486,142, a 62% non-Hispanic-white share, and a median household income of $122,418 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 8 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 12th State House District. Akashic. https://akashic.app/sld-lower/06012/. Accessed May 20, 2026. License: CC BY 4.0.