Downtown San Jose, San Jose, CA Political Map | Democrat & Republican Areas in Downtown San Jose

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

Downtown San Jose leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.

 

About 44% of adults in Downtown San Jose typically vote, below the U.S. average of about 62%. Among adults in Downtown San Jose, ~32% vote Democratic, ~12% Republican, and ~56% don't vote. The map below shows estimated turnout by block group.

How Downtown San Jose compares

Among neighborhoods within 5 miles, Downtown San Jose leans more Democratic than 10 of 11 neighbors.

Downtown San Jose runs about 27 points more Democratic than California as a whole.

Politics vary noticeably by block within Downtown San Jose. The south side is the most Democratic-leaning (D+53) and the northeast side is the least Democratic-leaning (D+41), a spread of about 12 points.

Why Downtown San Jose leans the way it does

This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Downtown San Jose, not a ranked or complete list of what matters most.

Areas with many never-married adults vote Democratic. About 52% of adults in Downtown San Jose have never been married, modestly above similar-sized neighborhoods (around 44%). Density combined with diversity predicts Democratic voting, and non-Hispanic white share in Downtown San Jose is about 23%, about 50 points below the U.S. average of 72%.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Downtown San Jose, San Jose, 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 Downtown San Jose looks the way it does

Crowded housing lines up with lower turnout. About 14% of homes in Downtown San Jose have more than one occupant per room, above 95% of neighborhoods. Renters vote less often than owners, and about 71% of households in Downtown San Jose rent, compared to around 44% in nearby neighborhoods. Low high-school completion lines up with lower turnout, and about 82% of adults in Downtown San Jose have completed high school, below 83% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.

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.