93309 is a true toss-up. About 48% of voters here vote Democratic and 52% Republican.
About 46% of adults in 93309 typically vote, below the U.S. average of about 62%. Among adults in 93309, ~22% vote Democratic, ~24% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How 93309 compares
Among zip codes within 15 miles, 93309 leans more Republican than 5 of 12 neighbors.
93309 runs about 23 points more Republican than California as a whole. California leans Democratic overall, while 93309 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 93309. The east side runs the most Democratic (D+5) and the west side runs the most Republican (R+31), a spread of about 36 points.
Why 93309 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 93309, not a ranked or complete list of what matters most.
93309 votes against the grain of California. California leans Democratic overall, while 93309 runs about 23 points more Republican.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as 93309, CA does.
Why turnout in 93309 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93309 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 52% of households in 93309 rent, about 27 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 26% of adults in 93309 report food insecurity, 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.