94605 is a Democratic stronghold. About 87% of voters here vote Democratic and 13% Republican.
About 57% of adults in 94605 typically vote, near the U.S. average of about 62%. Among adults in 94605, ~50% vote Democratic, ~7% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 94605 compares
Among zip codes within 15 miles, 94605 leans more Democratic than 59 of 75 neighbors.
94605 runs about 53 points more Democratic than California as a whole.
Politics vary noticeably by block within 94605. The northwest side is the most Democratic-leaning (D+79) and the west side is the least Democratic-leaning (D+69), a spread of about 11 points.
Why 94605 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 94605, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 94% of residents in 94605 live in densely developed areas, about 58 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94605 sits in the top quarter (about 41%, above 82% of zip codes). A high never-married share predicts Democratic voting, and about 43% of adults in 94605 have never been married, above 91% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 94605, 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 94605 looks the way it does
Areas with high food insecurity turn out at lower rates. About 23% of adults in 94605 report food insecurity, about 6 points above the U.S. average of 16%. Renters vote less often than owners, and about 39% of households in 94605 rent, above 85% of zip codes. Low high-school completion lines up with lower turnout, and about 86% of adults in 94605 have completed high school, below 79% 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.