93704 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 56% of adults in 93704 typically vote, below the U.S. average of about 62%. Among adults in 93704, ~32% vote Democratic, ~24% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How 93704 compares
Among zip codes within 15 miles, 93704 leans more Democratic than 19 of 28 neighbors.
93704 runs about 6 points more Republican than California as a whole.
Politics vary noticeably by block within 93704. The southeast side is the most Democratic-leaning (D+28) and the north side is the least Democratic-leaning (D+4), a spread of about 24 points.
Why 93704 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 93704, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 93704 live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 36% of adults in 93704 have never been married, above 82% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 93704, CA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 93704 looks the way it does
Areas with high food insecurity turn out at lower rates. About 21% of adults in 93704 report food insecurity, above 81% of zip codes. Renters vote less often than owners, and about 44% of households in 93704 rent, compared to around 61% in nearby 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.