93633 leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 59% of adults in 93633 typically vote, near the U.S. average of about 62%. Among adults in 93633, ~18% vote Democratic, ~41% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How 93633 compares
Among zip codes within 15 miles, 93633 leans more Republican than 1 of 4 neighbors.
93633 runs about 61 points more Republican than California as a whole. California leans Democratic overall, while 93633 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 93633. The northeast side is the most Republican-leaning (R+55) and the south side is the least Republican-leaning (R+27), a spread of about 28 points.
Why 93633 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 93633, not a ranked or complete list of what matters most.
93633 votes against the grain of California. California leans Democratic overall, while 93633 runs about 61 points more Republican. Rural areas vote Republican, and 93633 sits in the bottom quarter on density (fewer than 1%, in the bottom fraction of zip codes).
Population density and Republican lean
Places with low population density tend to lean Republican; 93633, CA sits in the bottom tenth nationally on this measure.
Why turnout in 93633 looks the way it does
Renters vote less often than owners. About 57% of households in 93633 rent, about 32 points above the U.S. average of 25%. 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.