94303 leans heavily Democratic by roughly 48 points: about 74% of voters vote Democratic and 26% Republican.
About 55% of adults in 94303 typically vote, below the U.S. average of about 62%. Among adults in 94303, ~40% vote Democratic, ~14% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How 94303 compares
Among zip codes within 15 miles, 94303 leans more Democratic than 34 of 52 neighbors.
94303 runs about 27 points more Democratic than California as a whole.
Why 94303 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 94303, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 95% of residents in 94303 live in densely developed areas, about 59 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94303 sits in the top quarter (about 49%, above 89% of zip codes). A high never-married share predicts Democratic voting, and about 38% of adults in 94303 have never been married, above 85% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 94303, 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 94303 looks the way it does
Crowded housing lines up with lower turnout. About 11% of homes in 94303 have more than one occupant per room, above 96% of zip codes. Renters vote less often than owners, and about 43% of households in 94303 rent, about 18 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 84% of adults in 94303 have completed high school, below 83% 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.