91024 leans heavily Democratic by roughly 30 points: about 65% of voters vote Democratic and 35% Republican.
About 78% of adults in 91024 typically vote, above the U.S. average of about 62%. Among adults in 91024, ~51% vote Democratic, ~27% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 91024 compares
Among zip codes within 15 miles, 91024 leans more Democratic than 53 of 87 neighbors.
91024 runs about 10 points more Democratic than California as a whole.
Politics vary noticeably by block within 91024. The north side is the most Democratic-leaning (D+36) and the southeast side is the least Democratic-leaning (D+22), a spread of about 14 points.
Why 91024 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 91024, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 66% of adults in 91024 hold a bachelor's degree, about 37 points above the U.S. average of 28%. Dense areas vote Democratic, and 91024 sits in the top fifth on density (about 89%, above 87% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 91024, CA sits in the top tenth nationally on this measure.
Why turnout in 91024 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 91024 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 77%, about 17 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in 91024 have completed high school, above 91% 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.