90272 leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 92% of adults in 90272 typically vote, above the U.S. average of about 62%. Among adults in 90272, ~61% vote Democratic, ~31% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How 90272 compares
Among zip codes within 15 miles, 90272 leans more Democratic than 30 of 98 neighbors.
90272 runs about 12 points more Democratic than California as a whole.
Politics vary noticeably by block within 90272. The east side is the most Democratic-leaning (D+47) and the northwest side is the least Democratic-leaning (D+21), a spread of about 26 points.
Why 90272 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 90272, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 78% of adults in 90272 hold a bachelor's degree, about 49 points above the U.S. average of 28%. Dense areas vote Democratic, and 90272 sits in the top fifth on density (about 81%, above 83% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 90272, CA sits in the top quarter nationally on this measure.
Why turnout in 90272 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 90272 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 78%, about 18 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 99% of adults in 90272 have completed high school, above 97% 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.