Old San Leandro leans heavily Democratic by roughly 50 points: about 75% of voters vote Democratic and 25% Republican.
About 49% of adults in Old San Leandro typically vote, below the U.S. average of about 62%. Among adults in Old San Leandro, ~36% vote Democratic, ~12% Republican, and ~52% don't vote. The map below shows estimated turnout by block group.
How Old San Leandro compares
Among neighborhoods within 5 miles, Old San Leandro leans more Democratic than 11 of 32 neighbors.
Old San Leandro runs about 30 points more Democratic than California as a whole.
Politics vary noticeably by block within Old San Leandro. The west side is the most Democratic-leaning (D+55) and the southeast side is the least Democratic-leaning (D+43), a spread of about 12 points.
Why Old San Leandro 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 Old San Leandro, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Old San Leandro live in densely developed areas, about 64 points above the U.S. average of 36%.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Old San Leandro, San Leandro, CA sits in the top tenth nationally on this measure.
Why turnout in Old San Leandro looks the way it does
Crowded housing lines up with lower turnout. About 9% of homes in Old San Leandro have more than one occupant per room, above 90% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- Assumption Parish, San Leandro, CA D+45
- Estudillo Estates-Glen, San Leandro, CA D+54
- Davis Tract, San Leandro, CA D+36
- Upper Bal, San Leandro, CA D+44
- Sobrante Park, Oakland, CA D+52
- Durant Manor, Oakland, CA D+60
- Lower Bal, San Leandro, CA D+39
- North Stonehurst, Oakland, CA D+59
- Floresta Gardens-Bradrick, San Leandro, CA D+41
- Iveywood, Oakland, CA D+61
Neighborhoods with Similar Populations
- Chelsea, Atlantic City, NJ D+12
- Berwick, Columbus, OH D+62
- Bella Vista, Philadelphia, PA D+76
- Kempsville Gardens, Virginia Beach, VA D+20
- Barton Hills, Austin, TX D+48
- Coolidge Corner, Brookline, MA D+70
- Wedgewood, Charlotte, NC D+66
- Mount Washington, Los Angeles, CA D+57
- Coronado, El Paso, TX D+18
- Pukalani, Makawao, HI D+20
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.