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

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

San Leandro leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.

 

About 53% of adults in San Leandro typically vote, below the U.S. average of about 62%. Among adults in San Leandro, ~37% vote Democratic, ~16% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.

How San Leandro compares

Among cities within 25 miles, San Leandro leans more Democratic than 40 of 95 neighbors.

San Leandro runs about 20 points more Democratic than California as a whole.

Politics vary noticeably by neighborhood within San Leandro. The north side is the most Democratic-leaning (D+55) and the south side is the least Democratic-leaning (D+28), a spread of about 27 points.

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

Dense areas vote Democratic. About 97% of residents in San Leandro live in densely developed areas, about 61 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and San Leandro sits in the top quarter (about 34%, above 80% of cities). A high never-married share predicts Democratic voting, and about 34% of adults in San Leandro have never been married, above 86% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; San Leandro, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.

Why turnout in San Leandro looks the way it does

Renters vote less often than owners. About 41% of households in San Leandro rent, about 16 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 11% of homes in San Leandro have more than one occupant per room, above 97% of cities. Low high-school completion lines up with lower turnout, and about 82% of adults in San Leandro have completed high school, below 88% 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.