93306 leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.
About 47% of adults in 93306 typically vote, below the U.S. average of about 62%. Among adults in 93306, ~22% vote Democratic, ~26% Republican, and ~52% don't vote. The map below shows estimated turnout by block group.
How 93306 compares
Among zip codes within 15 miles, 93306 leans more Republican than 7 of 13 neighbors.
93306 runs about 28 points more Republican than California as a whole. California leans Democratic overall, while 93306 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 93306. The southwest side runs the most Democratic (D+12) and the east side runs the most Republican (R+32), a spread of about 44 points.
Why 93306 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 93306, not a ranked or complete list of what matters most.
93306 votes Republican even though it is densely developed (about 86%, well 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 93306 are family households, above 86% of zip codes. 93306 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
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 93306, CA does.
Why turnout in 93306 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 93306 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 37% of households in 93306 rent, above 84% of zip codes. High food insecurity lines up with lower turnout, and about 30% of adults in 93306 report food insecurity, above 94% 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.