94577 leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.
About 54% of adults in 94577 typically vote, below the U.S. average of about 62%. Among adults in 94577, ~39% vote Democratic, ~15% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How 94577 compares
Among zip codes within 15 miles, 94577 leans more Democratic than 24 of 78 neighbors.
94577 runs about 25 points more Democratic than California as a whole.
Politics vary noticeably by block within 94577. The northeast side is the most Democratic-leaning (D+57) and the southwest side is the least Democratic-leaning (D+34), a spread of about 23 points.
Why 94577 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 94577, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 96% of residents in 94577 live in densely developed areas, about 60 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94577 sits in the top quarter (about 38%, above 79% of zip codes). A high never-married share predicts Democratic voting, and about 36% of adults in 94577 have never been married, above 81% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 94577, CA sits in the top tenth nationally on this measure.
Why turnout in 94577 looks the way it does
Crowded housing lines up with lower turnout. About 11% of homes in 94577 have more than one occupant per room, above 97% of zip codes. Renters vote less often than owners, and about 44% of households in 94577 rent, about 19 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 85% of adults in 94577 have completed high school, below 80% of zip codes. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes 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.