HarrisDemocratic67.4%20,668TrumpRepublican28.7%8,805OtherAll other candidates3.8%1,176
D+38.7- Lead
- 11,863
- Total
- 30,649
- vs nation
- D+40.2
- Turnout
- —
Akashiccity
Castro Valley, 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
BidenDemocratic71.3%25,100TrumpRepublican26.2%9,231OtherAll other candidates2.4%851
D+45.1- Lead
- 15,869
- Total
- 35,182
- vs nation
- D+40.7
- Turnout
- —
ClintonDemocratic68.9%20,129TrumpRepublican24.7%7,223OtherAll other candidates6.3%1,847
D+44.2- Lead
- 12,906
- Total
- 29,199
- vs nation
- D+42.1
- Turnout
- —
ObamaDemocratic67.8%18,746RomneyRepublican29.1%8,037OtherAll other candidates3.2%882
D+38.7- Lead
- 10,709
- Total
- 27,665
- vs nation
- D+34.9
- Turnout
- —
ObamaDemocratic69.3%19,964McCainRepublican30.6%8,810OtherAll other candidates0.2%49
D+38.7- Lead
- 11,154
- Total
- 28,823
- vs nation
- D+31.4
- Turnout
- —
KerryDemocratic63.5%17,296BushRepublican35.6%9,681OtherAll other candidates0.9%244
D+28.0- Lead
- 7,615
- Total
- 27,221
- vs nation
- D+30.4
- Turnout
- —
Key facts
- 2024 presidential margin
- D+38.7MIT Election Lab
- Population
- 65,0012024 5-year
- Median household income
- $142,7792024 5-year
- White (non-Hispanic)
- 34.3%2024 5-year
- Black
- 8.6%2024 5-year
- Hispanic / Latino
- 17.6%2024 5-year
- Peak Democratic margin
- D+45.1 in 2020MIT Election Lab
- Most similar
- Campbell, CA · twin score 96.9
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 2004 | +28.0% |
| 2008 | +38.7% |
| 2012 | +38.7% |
| 2016 | +44.2% |
| 2020 | +45.1% |
| 2024 | +38.7% |
DemocraticRepublican
6 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Swing | vs U.S. | Total |
|---|---|---|---|---|---|---|---|---|
| D | 67.4%Harris20,668 | 28.7%Trump8,805 | 3.8% | D+38.7 | R+6.4 | D+40.2 | 30,649 | |
| D | 71.3%Biden25,100 | 26.2%Trump9,231 | 2.4% | D+45.1 | D+0.9 | D+40.7 | 35,182 | |
| D | 68.9%Clinton20,129 | 24.7%Trump7,223 | 6.3% | D+44.2 | D+5.5 | D+42.1 | 29,199 | |
| D | 67.8%Obama18,746 | 29.1%Romney8,037 | 3.2% | D+38.7 | ±0.0 | D+34.9 | 27,665 | |
| D | 69.3%Obama19,964 | 30.6%McCain8,810 | 0.2% | D+38.7 | — | D+31.4 | 28,823 | |
| D | 63.5%Kerry17,296 | 35.6%Bush9,681 | 0.9% | D+28.0 | — | D+30.4 | 27,221 |
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 | D | 68.9%20,245 | 31.1%9,135 | 29,380 |
| 2020 | D | 71.5%23,903 | 28.5%9,533 | 33,436 |
Castro Valley has repeatedly voted against incorporation, remaining a census-designated place governed by the county — an unusual civic choice for a Bay Area suburb of 65,000 that shapes how its residents experience local services and representation.
Across the recorded series it reached a Democratic high of 45.1 points in 2020. Between 2020 and 2024 the city moved 6.4 points toward the Republican candidate; the 2024 margin was 38.7 points.
A population of 65,001, a 34% non-Hispanic-white share, and a median household income of $142,779 describe the city. The city's voting pattern over the last decade is most similar to that of Campbell and Sunnyvale.
Political twins — cities
The cities whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Campbell
California
96.9twin score
2012–2024 trajectory≠ Asian Indian ancestry
Sunnyvale
California
96.5twin score
2012–2024 trajectory≠ median age
Alameda
California
96.1twin score
college sharepopulation scale2016–2020 trajectory
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.
Castro Valley, California. Akashic. https://akashic.app/city/0611964/. 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 Castro Valley, California vote in 2024?
In 2024, Castro Valley, California voted Democratic by 38.7 points (D+38.7), carried by the Democratic candidate. Out of 30,649 votes cast, 20,668 went Democratic and 8,805 went Republican.
How many people live in Castro Valley, California?
Castro Valley, California has a population of 65,001 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Castro Valley, California?
Median household income in Castro Valley, California is $142,779 — above the national median of $80,734. The California state median is $99,122.
What is the political history of Castro Valley, California?
Akashic tracks 6 presidential elections in Castro Valley, California from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.