92140 leans heavily Democratic by roughly 36 points: about 68% of voters vote Democratic and 32% Republican.
About 32% of adults in 92140 typically vote, below the U.S. average of about 62%. Among adults in 92140, ~22% vote Democratic, ~10% Republican, and ~68% don't vote. The map below shows estimated turnout by block group.
How 92140 compares
Among zip codes within 15 miles, 92140 leans more Democratic than 38 of 50 neighbors.
92140 runs about 16 points more Democratic than California as a whole.
Why 92140 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 92140, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 92140 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 91% of adults in 92140 have never been married, in the top fraction of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 92140, CA sits in the top quarter nationally on this measure.
Why turnout in 92140 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 92140 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Low high-school completion lines up with lower turnout, and about 97% of adults in 92140 have completed high school, above 88% of zip codes. High-crime urban areas turn out at lower rates, and 92140 sits in the top 15% on a violent-crime measure. 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.