94599 leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 70% of adults in 94599 typically vote, above the U.S. average of about 62%. Among adults in 94599, ~48% vote Democratic, ~22% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 94599 compares
Among zip codes within 15 miles, 94599 leans more Democratic than 6 of 10 neighbors.
94599 runs about 18 points more Democratic than California as a whole.
Politics vary noticeably by block within 94599. The west side is the most Democratic-leaning (D+44) and the southwest side is the least Democratic-leaning (D+32), a spread of about 12 points.
Why 94599 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 94599, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 37% of adults in 94599 hold a bachelor's degree, about 9 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in 94599 is about 65%, below 72% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 94599, CA sits in the top quarter nationally on this measure.
Why turnout in 94599 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 94599 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 67%, about 7 points above the U.S. average of 60%. 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.