94089 leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 52% of adults in 94089 typically vote, below the U.S. average of about 62%. Among adults in 94089, ~34% vote Democratic, ~18% Republican, and ~48% don't vote. The map below shows estimated turnout by block group.
How 94089 compares
Among zip codes within 15 miles, 94089 leans more Democratic than 24 of 63 neighbors.
94089 runs about 13 points more Democratic than California as a whole.
Politics vary noticeably by block within 94089. The southwest side is the most Democratic-leaning (D+39) and the east side is the least Democratic-leaning (D+27), a spread of about 12 points.
Why 94089 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 94089, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 94089 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94089 sits in the top quarter (about 57%, above 93% of zip codes). A high never-married share predicts Democratic voting, and about 38% of adults in 94089 have never been married, above 84% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 94089, 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 94089 looks the way it does
Renters vote less often than owners. About 44% of households in 94089 rent, about 19 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 6% of homes in 94089 have more than one occupant per room, above 89% 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.