90745 leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.
About 50% of adults in 90745 typically vote, below the U.S. average of about 62%. Among adults in 90745, ~32% vote Democratic, ~18% Republican, and ~50% don't vote. The map below shows estimated turnout by block group.
How 90745 compares
Among zip codes within 15 miles, 90745 leans more Democratic than 27 of 96 neighbors.
90745 runs about 5 points more Democratic than California as a whole.
Politics vary noticeably by block within 90745. The southeast side is the most Democratic-leaning (D+38) and the southwest side is the least Democratic-leaning (D+19), a spread of about 19 points.
Why 90745 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 90745, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 90745 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 39% of adults in 90745 have never been married, above 86% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 90745, 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 90745 looks the way it does
Areas with high food insecurity turn out at lower rates. About 21% of adults in 90745 report food insecurity, about 5 points above the U.S. average of 16%. 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.