HarrisDemocratic71.4%179,600TrumpRepublican25.2%63,426KennedyIndependent1.5%3,844
D+46.2- Lead
- 116,174
- Total
- 251,426
- vs nation
- D+47.7
Akashicmetro area
Santa Rosa-Petaluma, CA
Office (updates table and map)
President margin by year
Place winner margin
1 counties by 2024 margin · County returns · MIT Election Lab
President results by year
Vote totals, margins, and source status
BidenDemocratic74.5%199,938TrumpRepublican23.0%61,825OtherAll other candidates2.4%6,554
D+51.5- Lead
- 138,113
- Total
- 268,317
- vs nation
- D+47.0
ClintonDemocratic68.8%160,435TrumpRepublican22.0%51,408OtherAll other candidates9.2%21,460
D+46.7- Lead
- 109,027
- Total
- 233,303
- vs nation
- D+44.6
ObamaDemocratic71.0%153,942RomneyRepublican25.3%54,784OtherAll other candidates3.8%8,139
D+45.7- Lead
- 99,158
- Total
- 216,865
- vs nation
- D+41.9
ObamaDemocratic73.6%168,888McCainRepublican24.0%55,127OtherAll other candidates2.3%5,336
D+49.6- Lead
- 113,761
- Total
- 229,351
- vs nation
- D+42.3
KerryDemocratic67.2%148,261BushRepublican30.9%68,204OtherAll other candidates1.9%4,225
D+36.3- Lead
- 80,057
- Total
- 220,690
- vs nation
- D+38.7
GoreDemocratic59.5%117,295BushRepublican32.2%63,529OtherAll other candidates8.2%16,182
D+27.3- Lead
- 53,766
- Total
- 197,006
- vs nation
- D+26.8
ClintonDemocratic55.6%100,738DoleRepublican29.5%53,555OtherAll other candidates14.9%27,004
D+26.0- Lead
- 47,183
- Total
- 181,297
- vs nation
- D+17.5
Key facts
- 2024 presidential margin
- D+46.2MIT Election Lab
- Population
- 485,0402024 5-year
- Population density
- 308 / sq mi2024 5-year · TIGER/Line
- Land area
- 1,575 sq miTIGER/Line
- Median household income
- $104,6742024 5-year
- White (non-Hispanic)
- 57.9%2024 5-year
- Black
- 1.5%2024 5-year
- Hispanic / Latino
- 30.0%2024 5-year
- Peak Democratic margin
- D+51.5 in 2020MIT Election Lab
- Peak Republican margin
- R+45.6 in 1924MIT Election Lab
- Most similar
- Santa Cruz-Watsonville, CA · twin score 98.8
presidential history
Party record book
Santa Rosa-Petaluma, CA · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 · 34 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Joe Biden2020
74.5%
199,938 votes · D+51.5
Runner-up · Barack Obama, 2008 · 73.6%
Republican
Warren G. Harding1920
66.9%
10,377 votes · R+40.7
Runner-up · Dwight D. Eisenhower, 1952 · 65.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
199,938votes
74.5% of the vote · D+51.5
Runner-up · Kamala Harris, 2024 · 179,600 votes
Republican
Ronald Reagan1984
76,447votes
51.1% of the vote · R+3.4
Runner-up · George W. Bush, 2004 · 68,204 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
Kamala Harris2024
+47.7pts D vs U.S.
Place D+46.2 · U.S. R+1.5
Runner-up · Joe Biden, 2020 · +47.0 pts
Republican
Dwight D. Eisenhower1952
+22.2pts R vs U.S.
Place R+33.0 · U.S. R+10.8
Runner-up · Calvin Coolidge, 1924 · +20.4 pts
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 shows U.S. House votes counted inside this Place. “Vote lead” is the local lead here, not necessarily the winner of the full contest.
voter registration
Registered voters
By party of registration, over time
Party registration · 2024D+38.4
Presidential vote · 2024D+46.2
Registration leans Democratic; the presidential vote runs 7.8 points more Democratic than the rolls.
304,906 registered voters · 2024 · up from 302,544 in 2022
domestic migration
Who moves in and out
Net domestic migration over time
+514 net domestic migration · 2025
20112025
Net −9,037 over 2011–2025 · gain loss
| Year | Net domestic migration |
|---|---|
| 2011 | +1,139 |
| 2012 | +1,321 |
| 2013 | +2,555 |
| 2014 | +2,864 |
| 2015 | +686 |
| 2016 | +130 |
| 2017 | −1,061 |
| 2018 | −4,202 |
| 2019 | −4,534 |
| 2021 | −3,893 |
| 2022 | −2,579 |
| 2023 | −1,628 |
| 2024 | −349 |
| 2025 | +514 |
Sonoma County's blend of agricultural roots and Bay Area commuter spillover has steadily shifted its voter composition, with registration margins narrowing in some precincts even as the area trends reliably blue at the countywide level.
Across the recorded series it reached a Democratic high of 51.5 points in 2020 and a Republican high of 45.6 points in 1924. Between 2020 and 2024 the metro moved 5.3 points toward the Republican candidate; the 2024 margin was 46.2 points.
A population of 485,040, a 58% non-Hispanic-white share, and a median household income of $104,674 describe the metro. The metro's voting pattern over the last decade is most similar to that of Santa Cruz-Watsonville, CA and Napa, CA.
Political twins — metros
The metros whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Santa Cruz-Watsonville, CA
98.8twin score
2008–2024 trajectory
Napa, CA
94.3twin score
2004–2024 trajectory≠ % Asian
San Francisco-Oakland-Fremont, CA
91.9twin score
2008–2024 trajectory≠ % Asian
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.
Santa Rosa-Petaluma, CA, California. Akashic. https://akashic.app/cbsa/42220/. Accessed May 20, 2026. License: CC BY 4.0.
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Frequently asked questions
How did Santa Rosa-Petaluma, CA, California vote in 2024?
In 2024, Santa Rosa-Petaluma, CA, California voted Democratic by 46.2 points (D+46.2), carried by the Democratic candidate. Out of 251,426 votes cast, 179,600 went Democratic and 63,426 went Republican.
When did Santa Rosa-Petaluma, CA, California last vote Republican?
The most recent presidential election in which Santa Rosa-Petaluma, CA, California voted Republican was 1984.
How many people live in Santa Rosa-Petaluma, CA, California?
Santa Rosa-Petaluma, CA, California has a population of 485,040 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Santa Rosa-Petaluma, CA, California?
Median household income in Santa Rosa-Petaluma, CA, California is $104,674 — above the national median of $80,734. The California state median is $99,122.
What is the political history of Santa Rosa-Petaluma, CA, California?
Akashic tracks 34 presidential elections in Santa Rosa-Petaluma, CA, California from 1892 to 2024. Of those, 14 went Democratic and 19 went Republican.