California 12th State Senate 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
Franklin D. Roosevelt1936
64.3%
35,334 votes · D+30.4 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 57.3%
Republican
George W. Bush2004
72.8%
229,241 votes · R+46.6 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 70.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
170,315votes
38.9% of the vote · R+20.1 · modeled estimate
Runner-up · Kamala Harris, 2024 · 147,703 votes
Republican
Donald Trump2020
258,375votes
58.9% of the vote · R+20.1 · modeled estimate
Runner-up · Donald Trump, 2024 · 254,439 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
Woodrow Wilson1912
+18.4pts D vs U.S.
Place D+38.0 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · +6.2 pts
Republican
George W. Bush2004
+44.1pts R vs U.S.
Place R+46.6 · U.S. R+2.5 · modeled estimate
Runner-up · George W. Bush, 2000 · +39.5 pts
current representation
Current officeholders
RShannon GroveState Senate · 12
State legislative officeholder from OpenStates nightly current-legislator data.
U.S. House elections · 2 House
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.
Source · Akashic county-allocated estimate from certified county returns, House; not precinct-counted.
Year
Vote lead
Democratic
Republican
Total
2024
R
28.9%78,597
71.1%193,708
272,305
2018
R
45.5%98,240
54.5%117,603
215,843
California 12th State Senate District sits in the Pacific Coast. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 38.0 points in 1912 and a Republican high of 46.6 points in 2004. Between 2020 and 2024 the district moved 5.8 points toward the Republican candidate; the 2024 margin was 25.9 points.
A population of 944,012, a 41% non-Hispanic-white share, and a median household income of $90,547 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 24 and State Senate District 18.
Akashic
Political twins — state-senate districts
The state-senate 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.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons → · Or open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
California 12th State Senate District. Akashic. https://akashic.app/sld-upper/06012/. Accessed May 20, 2026. License: CC BY 4.0.
How did California 12th State Senate District vote in 2024?
In 2024, California 12th State Senate District voted Republican by 25.9 points (R+25.9), carried by the Republican candidate. Out of 411,741 votes cast, 147,703 went Democratic and 254,439 went Republican.
When did California 12th State Senate District last vote Democratic?
The most recent presidential election in which California 12th State Senate District voted Democratic was 1964.
How many people live in California 12th State Senate District?
California 12th State Senate District has a population of 944,012 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in California 12th State Senate District?
Median household income in California 12th State Senate District is $90,547 — above the national median of $80,734. The California state median is $99,122.
What is the political history of California 12th State Senate District?
Akashic tracks 38 presidential elections in California 12th State Senate District from 1876 to 2024. Of those, 4 went Democratic and 33 went Republican.