96104 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 69% of adults in 96104 typically vote, above the U.S. average of about 62%. Among adults in 96104, ~23% vote Democratic, ~46% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 96104 compares
96104 runs about 54 points more Republican than California as a whole. California leans Democratic overall, while 96104 is one of the few Republican-leaning pockets.
Why 96104 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 96104, not a ranked or complete list of what matters most.
96104 votes against the grain of California. California leans Democratic overall, while 96104 runs about 54 points more Republican.
Population density and Republican lean
Places with low population density tend to lean Republican; 96104, CA sits in the bottom tenth nationally on this measure.
Why turnout in 96104 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 96104 have completed high school, about 11 points above the California average of 86%. 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.