HarrisDemocratic46.7%8,081TrumpRepublican50.3%8,708OtherAll other candidates3.1%531
R+3.6- Lead
- 627
- Total
- 17,320
- vs nation
- R+2.1
- Turnout
- —
Akashiccity
San Dimas, CA
Office (updates table and map)
President margin by year
Place winner margin
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
President results by year
Vote totals, margins, and source status
BidenDemocratic50.3%9,612TrumpRepublican47.7%9,119OtherAll other candidates2.1%393
D+2.6- Lead
- 493
- Total
- 19,124
- vs nation
- R+1.9
- Turnout
- —
ClintonDemocratic47.5%7,267TrumpRepublican46.6%7,119OtherAll other candidates5.9%906
D+1.0- Lead
- 148
- Total
- 15,292
- vs nation
- R+1.1
- Turnout
- —
ObamaDemocratic45.4%6,885RomneyRepublican52.1%7,890OtherAll other candidates2.5%375
R+6.6- Lead
- 1,005
- Total
- 15,150
- vs nation
- R+10.5
- Turnout
- —
ObamaDemocratic48.1%7,463McCainRepublican51.6%8,019OtherAll other candidates0.3%45
R+3.6- Lead
- 556
- Total
- 15,527
- vs nation
- R+10.9
- Turnout
- —
KerryDemocratic40.7%6,579BushRepublican58.1%9,391OtherAll other candidates1.1%182
R+17.4- Lead
- 2,812
- Total
- 16,152
- vs nation
- R+15.0
- Turnout
- —
Key facts
- 2024 presidential margin
- R+3.6MIT Election Lab
- Population
- 33,7892024 5-year
- Median household income
- $105,3212024 5-year
- White (non-Hispanic)
- 37.8%2024 5-year
- Black
- 3.2%2024 5-year
- Hispanic / Latino
- 37.1%2024 5-year
- Peak Democratic margin
- D+2.6 in 2020MIT Election Lab
- Peak Republican margin
- R+17.4 in 2004MIT Election Lab
- Most similar
- La Mirada, CA · twin score 95.3
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 2004 | −17.4% |
| 2008 | −3.6% |
| 2012 | −6.6% |
| 2016 | +1.0% |
| 2020 | +2.6% |
| 2024 | −3.6% |
DemocraticRepublican
6 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Swing | vs U.S. | Total |
|---|---|---|---|---|---|---|---|---|
| R | 46.7%Harris8,081 | 50.3%Trump8,708 | 3.1% | R+3.6 | — | R+2.1 | 17,320 | |
| D | 50.3%Biden9,612 | 47.7%Trump9,119 | 2.1% | D+2.6 | D+1.6 | R+1.9 | 19,124 | |
| D | 47.5%Clinton7,267 | 46.6%Trump7,119 | 5.9% | D+1.0 | — | R+1.1 | 15,292 | |
| R | 45.4%Obama6,885 | 52.1%Romney7,890 | 2.5% | R+6.6 | — | R+10.5 | 15,150 | |
| R | 48.1%Obama7,463 | 51.6%McCain8,019 | 0.3% | R+3.6 | — | R+10.9 | 15,527 | |
| R | 40.7%Kerry6,579 | 58.1%Bush9,391 | 1.1% | R+17.4 | — | R+15.0 | 16,152 |
Federal and statewide elections · 2 House
U.S. House
Each row shows U.S. House votes counted inside this Place. “Vote lead” is the local lead here, not necessarily the winner of the full contest.
| Year | Vote lead | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | R | 46.6%7,775 | 53.4%8,910 | 16,685 |
| 2020 | R | 49.1%8,729 | 50.9%9,061 | 17,790 |
San Dimas sits along the San Gabriel Valley's eastern edge, where suburban homeowner demographics and a modest but growing Latino share of residents have gradually compressed what was once a reliably wide Republican registration advantage.
Across the recorded series it reached a Democratic high of 2.6 points in 2020 and a Republican high of 17.4 points in 2004. Between 2020 and 2024 the city moved 6.2 points toward the Republican candidate; the 2024 margin was 3.6 points.
A population of 33,789, a 38% non-Hispanic-white share, and a median household income of $105,321 describe the city. The city's voting pattern over the last decade is most similar to that of La Mirada and La Verne.
Political twins — cities
The cities whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
La Mirada
California
95.3twin score
% Latinopopulation scalemedian age
La Verne
California
94.7twin score
% Latinopopulation scale12-yr trend
Glendora
California
92.4twin score
% Latinopopulation scaleMexican ancestry
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.
Browse places by community — income, education, race & ethnicity, language — all community cuts →
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.
San Dimas, California. Akashic. https://akashic.app/city/0666070/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
California at the ballot boxAll elections →
Frequently asked questions
How did San Dimas, California vote in 2024?
In 2024, San Dimas, California voted Republican by 3.6 points (R+3.6), carried by the Republican candidate. Out of 17,320 votes cast, 8,081 went Democratic and 8,708 went Republican.
When did San Dimas, California last vote Democratic?
The most recent presidential election in which San Dimas, California voted Democratic was 2020.
How many people live in San Dimas, California?
San Dimas, California has a population of 33,789 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in San Dimas, California?
Median household income in San Dimas, California is $105,321 — above the national median of $80,734. The California state median is $99,122.
What is the political history of San Dimas, California?
Akashic tracks 6 presidential elections in San Dimas, California from 2004 to 2024. Of those, 2 went Democratic and 4 went Republican.