94027 leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 80% of adults in 94027 typically vote, above the U.S. average of about 62%. Among adults in 94027, ~57% vote Democratic, ~23% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How 94027 compares
Among zip codes within 15 miles, 94027 leans more Democratic than 21 of 44 neighbors.
94027 runs about 23 points more Democratic than California as a whole.
Politics vary noticeably by block within 94027. The north side is the most Democratic-leaning (D+53) and the southeast side is the least Democratic-leaning (D+36), a spread of about 17 points.
Why 94027 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 94027, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 83% of adults in 94027 hold a bachelor's degree, about 55 points above the U.S. average of 28%. Dense areas vote Democratic, and 94027 sits in the top fifth on density (about 99%, above 95% of zip codes).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 94027, CA sits in the top quarter 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 94027 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 94027 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 76%, about 16 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 88% of households in 94027 own their home, compared to around 51% in nearby zip codes. High high-school completion lines up with higher turnout, and about 99% of adults in 94027 have completed high school, above 97% 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.