Oakville leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 58% of adults in Oakville typically vote, near the U.S. average of about 62%. Among adults in Oakville, ~38% vote Democratic, ~20% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How Oakville compares
Among cities within 25 miles, Oakville leans more Democratic than 14 of 34 neighbors.
Oakville runs about 11 points more Democratic than California as a whole.
Politics vary noticeably by neighborhood within Oakville. The south side is the most Democratic-leaning (D+47) and the northeast side is the least Democratic-leaning (D+3), a spread of about 43 points.
Why Oakville leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Oakville, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 34% of adults in Oakville hold a bachelor's degree, about 5 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in Oakville is about 63%, below 82% of cities. A high never-married share predicts Democratic voting, and about 34% of adults in Oakville have never been married, above 86% of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Oakville, CA sits above the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Oakville looks the way it does
Renters vote less often than owners. About 54% of households in Oakville rent, about 29 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and Oakville sits in the top quarter on routine-care measures. Low high-school completion lines up with lower turnout, and about 84% of adults in Oakville have completed high school, below 82% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Yountville, CA D+32
- Napa, CA D+32
- Eldridge, CA D+44
- Sonoma, CA D+48
- Glen Ellen, CA D+54
- Rutherford, CA D+39
- St. Helena, CA D+37
- El Verano, CA D+43
- Kenwood, CA D+53
- Salvador, CA D+26
Cities with Similar Populations
- Union Mills, NC R+54
- Colon, MI R+39
- Tillson, NY D+22
- Welches, OR Even
- Seneca, PA R+48
- Caney, KS R+65
- Texico, NM R+59
- North York, PA D+7
- Haysi, VA R+67
- Flovilla, GA R+37
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Sources and methodology
Precinct-level voting records used to fit the model come from California Secretary of State, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.