92840 is a true toss-up. About 51% of voters here vote Democratic and 49% Republican.
About 46% of adults in 92840 typically vote, below the U.S. average of about 62%. Among adults in 92840, ~23% vote Democratic, ~23% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How 92840 compares
Among zip codes within 15 miles, 92840 sits roughly in the middle of the political spectrum, with 32 neighbors leaning further in the place's direction and 63 leaning the other way.
92840 runs about 17 points more Republican than California as a whole.
Politics vary noticeably by block within 92840. The east side runs the most Democratic (D+10) and the west side runs the most Republican (R+6), a spread of about 15 points.
Why 92840 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 92840. The lean here lands roughly where demographic data alone would predict.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 92840, 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 92840 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 92840 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 46% of households in 92840 rent, about 21 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 22% of adults in 92840 report food insecurity, above 83% 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.