Vacaville, CA Political Map | Democrat & Republican Areas in Vacaville

By the BestNeighborhood data science team. Last updated May 2026.

Vacaville leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% Republican.

 

About 62% of adults in Vacaville typically vote, near the U.S. average of about 62%. Among adults in Vacaville, ~33% vote Democratic, ~29% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.

How Vacaville compares

Among cities within 25 miles, Vacaville leans more Democratic than 21 of 39 neighbors.

Vacaville runs about 15 points more Republican than California as a whole.

Politics vary noticeably by neighborhood within Vacaville. The south side runs the most Democratic (D+16) and the northwest side runs the most Republican (R+17), a spread of about 33 points.

Why Vacaville 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 Vacaville, not a ranked or complete list of what matters most.

Dense areas vote Democratic. About 78% of residents in Vacaville live in densely developed areas, about 41 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 33% of adults in Vacaville have never been married, above 84% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Vacaville, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.

Why turnout in Vacaville looks the way it does

Renters vote less often than owners. About 31% of households in Vacaville rent, about 6 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.

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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.