Akashic
1892–2024
Akashic
California 12th State House District
presidential margin
2008D+54.72012D+50.42016D+56.22020D+59.52024D+55.5
full record · 2008 → 2024
D+55.5
2024
median income$122,418U.S. $80,734 · CA $99,122
median age44.7U.S. 39.1 · CA 37.9
poverty rate8.5%U.S. 12.5% · CA 12.0%
bachelor’s+ (25+)53.9%U.S. 35.6% · CA 36.6%
non-english24.9%U.S. 22.3% · CA 44.4%
race · ethnicity · ancestry
English13.7%
German13.4%
Irish13.3%
Mexican13.7%
Guatemalan3.7%
Salvadoran1.2%
Aztec3.1%
Chinese1.5%
Filipino1.1%
Asian Indian0.9%
African American†1.5%
religion

Religious adherence is published only at the county level (U.S. Religion Census). See Marin County.

American Community Survey 2024 5-year (income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024.

California 12th State House District

Akashic
California 12th State House DistrictHarrisD+55.5
2024
2024 presidential margin for California 12th State House DistrictThe boundary of California 12th State House District, filled by its 2024 presidential margin (D+55.5), over faint outlines of the counties it is drawn from.California 12th State House District · D+55.5
How it voted
Share of the 2024 vote
Kamala Harris ✓Democratic76.3%194,650
Donald TrumpRepublican20.7%52,936
Robert F. Kennedy Jr.American Independent3.0%7,677
D+60
R+60
District boundary, filled by its own 2024 D-vs-R margin — precinct detail where available, over the 2 counties it's drawn from (shown faint).
The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.
County-level results (2 counties) — table
2024 presidential result by county for California 12th State House District — winner and D-vs-R margin.
CountyWinnerMargin
Marin County, CADemocraticD+63.9
Sonoma County, CADemocraticD+46.2
5 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonDemocraticRepublicanOtherMarginTotal
D
76.3%Harris194,650
20.7%Trump52,936
3.0%Kennedy7,677
+55.5%
255,263
D
78.7%Biden214,257
19.2%Trump52,354
2.1%Jorgensen5,714
+59.5%
272,325
D
75.0%Clinton176,702
18.8%Trump44,241
6.3%Johnson14,757
+56.2%
235,700
D
75.2%Obama164,225
24.8%Romney54,229
0.0%
+50.4%
218,454
D
77.2%Obama179,330
22.5%McCain52,340
0.3%Nader603
+54.7%
232,273
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
Presidential margin over timeDemocratic-minus-Republican presidential margin from 2008 to 2024. Most recent: +55.5% in 2024.+55.5%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+54.7%
2012+50.4%
2016+56.2%
2020+59.5%
2024+55.5%
DemocraticRepublican
current representation
Current officeholders
DDamon ConnollyState House · 12

State legislative officeholder from OpenStates nightly current-legislator data.

Source · OpenStates current legislator CSV.

Assembly District 12 recorded a D+55.5 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 59.5 points in 2020. Between 2020 and 2024 the district moved 3.9 points toward the Republican candidate; the 2024 margin was 55.5 points.

A population of 486,142, a 65% 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 Assembly District 14 and Assembly District 28.

Political twins — state-house districts

The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

Assembly District 14
California
88.9twin score
2008–2024 trajectory≠ % Asian
Assembly District 28
California
88.8twin score
2016–2024 trajectorypopulation scale≠ % Asian
State Legislative District 18
Maryland
88.6twin score
2008–2024 trajectory≠ % unaffiliated

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 →

Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
California 12th State House District. Akashic. https://akashic.app/sld-lower/06012/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Places within California 12th State House District

counties it covers2
Marin CountySonoma County

Frequently asked questions

How did California 12th State House District vote in 2024?
In 2024, California 12th State House District voted Democratic by 55.5 points (D+55.5), carried by the Democratic candidate. Out of 255,263 votes cast, 194,650 went Democratic and 52,936 went Republican.
How many people live in California 12th State House District?
California 12th State House District has a population of 486,142 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 House District?
Median household income in California 12th State House District is $122,418 — above the national median of $80,734. The California state median is $99,122.
What is the political history of California 12th State House District?
Akashic tracks 5 presidential elections in California 12th State House District from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican.