Serra Highlands leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 64% of adults in Serra Highlands typically vote, near the U.S. average of about 62%. Among adults in Serra Highlands, ~45% vote Democratic, ~19% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How Serra Highlands compares
Among neighborhoods within 5 miles, Serra Highlands leans more Democratic than 16 of 24 neighbors.
Serra Highlands runs about 23 points more Democratic than California as a whole.
Why Serra Highlands 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 Serra Highlands, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Serra Highlands live in densely developed areas, about 64 points above the U.S. average of 36%.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Serra Highlands, South San Francisco, CA sits in the top quarter 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 Serra Highlands looks the way it does
Homeowners vote more often than renters. About 86% of households in Serra Highlands own their home, about 23 points above the California average of 62%. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- El Camino, South San Francisco, CA D+43
- Westborough, South San Francisco, CA D+41
- Sunshine Gardens, South San Francisco, CA D+41
- Serramonte, Daly City, CA D+36
- Westview, Pacifica, CA D+52
- Fairmont, Pacifica, CA D+38
- Downtown South San Francisco, South San Francisco, CA D+46
- Paradise Valley, South San Francisco, CA D+42
- Edgemar-Pacific Manor, Pacifica, CA D+54
- Lindenville, South San Francisco, CA D+40
Neighborhoods with Similar Populations
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.