93730 leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 74% of adults in 93730 typically vote, above the U.S. average of about 62%. Among adults in 93730, ~30% vote Democratic, ~44% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 93730 compares
Among zip codes within 15 miles, 93730 leans more Republican than 19 of 24 neighbors.
93730 runs about 40 points more Republican than California as a whole. California leans Democratic overall, while 93730 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 93730. The north side is the most Republican-leaning (R+27) and the south side is the least Republican-leaning (R+9), a spread of about 18 points.
Why 93730 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 93730, not a ranked or complete list of what matters most.
93730 votes Republican even though it is densely developed (about 89%, far above the California average of 58%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 77% of households in 93730 are family households, above 87% of zip codes. 93730 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Food insecurity and voter turnout
Places with low food insecurity tend to turn out at a higher rate; 93730, CA sits in the bottom quarter nationally on this measure. Food insecurity does not directly drive turnout; it reflects economic hardship, which lines up with lower voting.
Why turnout in 93730 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 93730 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 71%, about 11 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in 93730 have completed high school, above 90% 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.