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

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

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

 

About 36% of adults in Downtown South San Francisco typically vote, below the U.S. average of about 62%. Among adults in Downtown South San Francisco, ~26% vote Democratic, ~10% Republican, and ~64% don't vote. The map below shows estimated turnout by block group.

How Downtown South San Francisco compares

Among neighborhoods within 5 miles, Downtown South San Francisco leans more Democratic than 18 of 23 neighbors.

Downtown South San Francisco runs about 26 points more Democratic than California as a whole.

Why Downtown South San Francisco 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 South San Francisco, not a ranked or complete list of what matters most.

Areas with many never-married adults vote Democratic. About 49% of adults in Downtown South San Francisco have never been married, well above similar-sized neighborhoods (around 32%).

Population density and Democratic lean

Places with high population density tend to lean Democratic; Downtown South San Francisco, South San Francisco, CA sits in the top tenth nationally on this measure.

Why turnout in Downtown South San Francisco looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Downtown South San Francisco is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 83% of households in Downtown South San Francisco rent, compared to around 36% in nearby neighborhoods. Crowded housing lines up with lower turnout, and about 17% of homes in Downtown South San Francisco have more than one occupant per room, above 97% of neighborhoods. 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.