93921 leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 82% of adults in 93921 typically vote, above the U.S. average of about 62%. Among adults in 93921, ~58% vote Democratic, ~24% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How 93921 compares
Among zip codes within 15 miles, 93921 leans more Democratic than 8 of 9 neighbors.
93921 runs about 23 points more Democratic than California as a whole.
Why 93921 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 93921, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 87% of residents in 93921 live in densely developed areas, about 51 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 93921 sits in the top quarter (about 72%, above 98% of zip codes).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 93921, CA sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 93921 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 93921 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 78%, about 18 points above the U.S. average of 60%. 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.