California 1st 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
69.2%
55,721 votes · D+40.1 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · 67.4%
Republican
Warren G. Harding1920
64.6%
26,749 votes · R+36.7 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 63.6%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
187,403votes
40.9% of the vote · R+15.8 · modeled estimate
Runner-up · Barack Obama, 2008 · 168,374 votes
Republican
Donald Trump2020
259,831votes
56.7% of the vote · R+15.8 · modeled estimate
Runner-up · Donald Trump, 2024 · 254,446 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
+28.1pts D vs U.S.
Place D+47.6 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · Franklin D. Roosevelt, 1932 · +21.3 pts
Republican
George W. Bush2000
+28.4pts R vs U.S.
Place R+27.9 · U.S. D+0.5 · modeled estimate
Runner-up · Bob Dole, 1996 · +25.5 pts
current representation
Current officeholders
RMegan DahleState Senate · 1
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
37.6%157,202
62.4%260,882
418,084
2018
R
45.6%160,744
54.4%191,991
352,735
California 1st State Senate District sits in the Pacific Coast. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 47.6 points in 1912 and a Republican high of 36.7 points in 1920. Between 2020 and 2024 the district moved 5.1 points toward the Republican candidate; the 2024 margin was 20.9 points.
A population of 943,031, a 60% non-Hispanic-white share, and a median household income of $72,530 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 4 and State Senate District 12.
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 1st State Senate District. Akashic. https://akashic.app/sld-upper/06001/. Accessed May 20, 2026. License: CC BY 4.0.
How did California 1st State Senate District vote in 2024?
In 2024, California 1st State Senate District voted Republican by 20.9 points (R+20.9), carried by the Republican candidate. Out of 430,665 votes cast, 164,301 went Democratic and 254,446 went Republican.
When did California 1st State Senate District last vote Democratic?
The most recent presidential election in which California 1st State Senate District voted Democratic was 1964.
How many people live in California 1st State Senate District?
California 1st State Senate District has a population of 943,031 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in California 1st State Senate District?
Median household income in California 1st State Senate District is $72,530 — below the national median of $80,734. The California state median is $99,122.
What is the political history of California 1st State Senate District?
Akashic tracks 38 presidential elections in California 1st State Senate District from 1876 to 2024. Of those, 11 went Democratic and 25 went Republican.