90057 leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 27% of adults in 90057 typically vote, below the U.S. average of about 62%. Among adults in 90057, ~19% vote Democratic, ~8% Republican, and ~73% don't vote. The map below shows estimated turnout by block group.
How 90057 compares
Among zip codes within 15 miles, 90057 leans more Democratic than 72 of 172 neighbors.
90057 runs about 19 points more Democratic than California as a whole.
Politics vary noticeably by block within 90057. The west side is the most Democratic-leaning (D+45) and the east side is the least Democratic-leaning (D+35), a spread of about 11 points.
Why 90057 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 90057, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 90057 live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 58% of adults in 90057 have never been married, above 98% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 90057, CA sits in the top tenth nationally on this measure.
Why turnout in 90057 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 90057 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 45%, about 17 points below the California average of 62%. Renters vote less often than owners, and about 96% of households in 90057 rent, about 71 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 40% of adults in 90057 report food insecurity, above 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.