San Lorenzo, CA Political Map | Democrat & Republican Areas in San Lorenzo

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

San Lorenzo leans heavily Democratic by roughly 34 points: about 67% of voters vote Democratic and 33% Republican.

 

About 52% of adults in San Lorenzo typically vote, below the U.S. average of about 62%. Among adults in San Lorenzo, ~35% vote Democratic, ~17% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.

How San Lorenzo compares

Among cities within 25 miles, San Lorenzo leans more Democratic than 16 of 85 neighbors.

San Lorenzo runs about 14 points more Democratic than California as a whole.

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

Dense areas vote Democratic. About 99% of residents in San Lorenzo live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 32% of adults in San Lorenzo have never been married, above 81% of cities.

Paved land cover and Democratic lean

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

Crowded housing lines up with lower turnout. About 10% of homes in San Lorenzo have more than one occupant per room, above 96% of cities. Low high-school completion lines up with lower turnout, and about 83% of adults in San Lorenzo have completed high school, below 85% of cities. 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.