90280 leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 38% of adults in 90280 typically vote, below the U.S. average of about 62%. Among adults in 90280, ~26% vote Democratic, ~12% Republican, and ~62% don't vote. The map below shows estimated turnout by block group.
How 90280 compares
Among zip codes within 15 miles, 90280 leans more Democratic than 71 of 167 neighbors.
90280 runs about 16 points more Democratic than California as a whole.
Why 90280 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 90280, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 90280 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 45% of adults in 90280 have never been married, above 92% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 90280, CA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 90280 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 90280 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 23%, about 13 points above the California average of 10%. Renters vote less often than owners, and about 55% of households in 90280 rent, about 30 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 33% of adults in 90280 report food insecurity, above 95% 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.