93528 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 37% of adults in 93528 typically vote, below the U.S. average of about 62%. Among adults in 93528, ~12% vote Democratic, ~25% Republican, and ~63% don't vote. The map below shows estimated turnout by block group.
How 93528 compares
93528 sits in a sparsely populated area with few comparable zip codes nearby.
93528 runs about 53 points more Republican than California as a whole. California leans Democratic overall, while 93528 is one of the few Republican-leaning pockets.
Why 93528 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 93528, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 3% of adults in 93528 hold a bachelor's degree, about 32 points below the California average of 35%. 93528 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 93528, CA sits in the bottom 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 93528 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93528 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 44%, about 18 points below the California average of 62%. High food insecurity lines up with lower turnout, and about 32% of adults in 93528 report food insecurity, above 95% of zip codes. Low high-school completion lines up with lower turnout, and about 55% of adults in 93528 have completed high school, in the bottom fraction 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.