93304 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 35% of adults in 93304 typically vote, below the U.S. average of about 62%. Among adults in 93304, ~19% vote Democratic, ~16% Republican, and ~65% don't vote. The map below shows estimated turnout by block group.
How 93304 compares
Among zip codes within 15 miles, 93304 leans more Democratic than 11 of 13 neighbors.
93304 runs about 10 points more Republican than California as a whole.
Politics vary noticeably by block within 93304. The northeast side runs the most Democratic (D+32) and the northwest side runs the most Republican (Even), a spread of about 32 points.
Why 93304 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 93304, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 93304 live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 48% of adults in 93304 have never been married, above 94% of zip codes.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 93304, CA sits in the bottom tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 93304 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93304 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 46%, about 16 points below the California average of 62%. Renters vote less often than owners, and about 53% of households in 93304 rent, about 28 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 38% of adults in 93304 report food insecurity, above 98% 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.