92866 leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 54% of adults in 92866 typically vote, below the U.S. average of about 62%. Among adults in 92866, ~31% vote Democratic, ~23% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.
How 92866 compares
Among zip codes within 15 miles, 92866 leans more Democratic than 62 of 82 neighbors.
92866 runs about 5 points more Republican than California as a whole.
Politics vary noticeably by block within 92866. The northwest side is the most Democratic-leaning (D+28) and the southeast side is the least Democratic-leaning (D+7), a spread of about 21 points.
Why 92866 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 92866, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 92866 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 92866 have never been married, above 92% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 92866, CA sits in the top tenth nationally on this measure.
Why turnout in 92866 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 92866 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 66% of households in 92866 rent, compared to around 45% in nearby zip codes. Crowded housing lines up with lower turnout, and about 12% of homes in 92866 have more than one occupant per room, above 97% 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.