93664 leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 82% of adults in 93664 typically vote, above the U.S. average of about 62%. Among adults in 93664, ~34% vote Democratic, ~49% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How 93664 compares
Among zip codes within 15 miles, 93664 leans more Republican than 1 of 5 neighbors.
93664 runs about 38 points more Republican than California as a whole. California leans Democratic overall, while 93664 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 93664. The southeast side is the most Republican-leaning (R+44) and the west side is the least Republican-leaning (R+12), a spread of about 32 points.
Why 93664 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 93664, not a ranked or complete list of what matters most.
93664 votes against the grain of California. California leans Democratic overall, while 93664 runs about 38 points more Republican.
Population density and Republican lean
Places with low population density tend to lean Republican; 93664, CA sits in the bottom quarter nationally on this measure.
Why turnout in 93664 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 93664 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 65%, above 65% of zip codes. Homeowners vote more often than renters, and about 93% of households in 93664 own their home, about 18 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 97% of adults in 93664 have completed high school, above 88% 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.