94401 leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.
About 49% of adults in 94401 typically vote, below the U.S. average of about 62%. Among adults in 94401, ~36% vote Democratic, ~13% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.
How 94401 compares
Among zip codes within 15 miles, 94401 leans more Democratic than 20 of 53 neighbors.
94401 runs about 27 points more Democratic than California as a whole.
Politics vary noticeably by block within 94401. The southwest side is the most Democratic-leaning (D+54) and the northeast side is the least Democratic-leaning (D+37), a spread of about 17 points.
Why 94401 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 94401, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 96% of residents in 94401 live in densely developed areas, about 59 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94401 sits in the top quarter (about 45%, above 85% of zip codes). A high never-married share predicts Democratic voting, and about 42% of adults in 94401 have never been married, above 90% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 94401, CA sits in the top tenth nationally on this measure.
Why turnout in 94401 looks the way it does
Renters vote less often than owners. About 57% of households in 94401 rent, about 32 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 13% of homes in 94401 have more than one occupant per room, above 98% of zip codes. Low high-school completion lines up with lower turnout, and about 84% of adults in 94401 have completed high school, below 84% 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.