90245 leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 71% of adults in 90245 typically vote, above the U.S. average of about 62%. Among adults in 90245, ~49% vote Democratic, ~22% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.
How 90245 compares
Among zip codes within 15 miles, 90245 leans more Democratic than 32 of 114 neighbors.
90245 runs about 17 points more Democratic than California as a whole.
Politics vary noticeably by block within 90245. The southwest side is the most Democratic-leaning (D+49) and the southeast side is the least Democratic-leaning (D+25), a spread of about 25 points.
Why 90245 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 90245, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 90245 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 90245 sits in the top quarter (about 63%, above 95% of zip codes). A high never-married share predicts Democratic voting, and about 37% of adults in 90245 have never been married, above 82% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 90245, CA sits in the top tenth nationally on this measure.
Why turnout in 90245 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 90245 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 90245 have completed high school, above 94% 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.