93042 leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 28% of adults in 93042 typically vote, below the U.S. average of about 62%. Among adults in 93042, ~12% vote Democratic, ~16% Republican, and ~72% don't vote. The map below shows estimated turnout by block group.
How 93042 compares
Among zip codes within 15 miles, 93042 is the most Republican-leaning.
93042 runs about 36 points more Republican than California as a whole. California leans Democratic overall, while 93042 is one of the few Republican-leaning pockets.
Why 93042 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 93042, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 85% of residents in 93042 drive to work alone, about 12 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 93% of households in 93042 are family households, in the top fraction of zip codes. 93042 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Homeownership and voter turnout
Places with renter-heavy households tend to turn out at a lower rate; 93042, CA sits in the bottom tenth nationally on this measure.
Why turnout in 93042 looks the way it does
Renters vote less often than owners. About 99% of households in 93042 rent, about 74 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and more than 99% of adults in 93042 have completed high school, in the top fraction of zip codes. High-crime urban areas turn out at lower rates, and 93042 sits in the top 15% on a violent-crime measure. 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.