93905 leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 33% of adults in 93905 typically vote, below the U.S. average of about 62%. Among adults in 93905, ~22% vote Democratic, ~11% Republican, and ~67% don't vote. The map below shows estimated turnout by block group.
How 93905 compares
Among zip codes within 15 miles, 93905 is the most Democratic-leaning.
93905 runs about 17 points more Democratic than California as a whole.
Why 93905 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 93905, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 94% of residents in 93905 live in densely developed areas, about 58 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 54% of adults in 93905 have never been married, above 96% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 93905, CA sits in the top tenth nationally on this measure.
Why turnout in 93905 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93905 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 45%, about 17 points below the California average of 62%. Renters vote less often than owners, and about 58% of households in 93905 rent, about 33 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 40% of adults in 93905 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.