93009 leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 49% of adults in 93009 typically vote, below the U.S. average of about 62%. Among adults in 93009, ~31% vote Democratic, ~18% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.
How 93009 compares
Among zip codes within 15 miles, 93009 leans more Democratic than 11 of 16 neighbors.
93009 runs about 7 points more Democratic than California as a whole.
Why 93009 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 93009, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 93009 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 64% of adults in 93009 have never been married, above 98% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 93009, CA sits in the top quarter nationally on this measure.
Why turnout in 93009 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93009 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Low high-school completion lines up with lower turnout, and about 67% of adults in 93009 have completed high school, below 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.