95427 is a Democratic stronghold. About 75% of voters here vote Democratic and 25% Republican.
About 45% of adults in 95427 typically vote, below the U.S. average of about 62%. Among adults in 95427, ~34% vote Democratic, ~11% Republican, and ~55% don't vote. The map below shows estimated turnout by block group.
How 95427 compares
Among zip codes within 15 miles, 95427 leans more Democratic than 3 of 7 neighbors.
95427 runs about 30 points more Democratic than California as a whole.
Why 95427 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 95427, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 44% of adults in 95427 hold a bachelor's degree, about 15 points above the U.S. average of 28%.
Population density and Republican lean
Places with low population density tend to lean Republican; 95427, CA sits in the bottom quarter nationally on this measure.
Why turnout in 95427 looks the way it does
Crowded housing lines up with lower turnout. About 6% of homes in 95427 have more than one occupant per room, above 89% of zip codes. Renters vote less often than owners, and about 34% of households in 95427 rent, above 81% 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.