93030 leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 43% of adults in 93030 typically vote, below the U.S. average of about 62%. Among adults in 93030, ~28% vote Democratic, ~15% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.
How 93030 compares
Among zip codes within 15 miles, 93030 leans more Democratic than 14 of 15 neighbors.
93030 runs about 12 points more Democratic than California as a whole.
Politics vary noticeably by block within 93030. The southeast side is the most Democratic-leaning (D+41) and the northeast side is the least Democratic-leaning (D+25), a spread of about 15 points.
Why 93030 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 93030, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 94% of residents in 93030 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 42% of adults in 93030 have never been married, above 90% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 93030, CA sits in the top tenth nationally on this measure.
Why turnout in 93030 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93030 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 51% of households in 93030 rent, about 26 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 27% of adults in 93030 report food insecurity, above 92% 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.