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

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

Vallejo leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.

 

About 52% of adults in Vallejo typically vote, below the U.S. average of about 62%. Among adults in Vallejo, ~36% vote Democratic, ~16% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.

How Vallejo compares

Among cities within 25 miles, Vallejo leans more Democratic than 27 of 73 neighbors.

Vallejo runs about 18 points more Democratic than California as a whole.

Politics vary noticeably by neighborhood within Vallejo. The west side is the most Democratic-leaning (D+48) and the northeast side is the least Democratic-leaning (D+29), a spread of about 19 points.

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

Dense areas vote Democratic. About 88% of residents in Vallejo live in densely developed areas, about 52 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 38% of adults in Vallejo have never been married, above 91% of cities.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Vallejo, CA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.

Why turnout in Vallejo looks the way it does

Renters vote less often than owners. About 41% of households in Vallejo rent, about 16 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 7% of homes in Vallejo have more than one occupant per room, above 93% of cities. 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.