91307 leans Democratic by roughly 18 points: about 59% of voters vote Democratic and 41% Republican.
About 74% of adults in 91307 typically vote, above the U.S. average of about 62%. Among adults in 91307, ~43% vote Democratic, ~30% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 91307 compares
Among zip codes within 15 miles, 91307 leans more Democratic than 13 of 55 neighbors.
Politically, 91307 sits close to the rest of California.
Politics vary noticeably by block within 91307. The southeast side is the most Democratic-leaning (D+25) and the northwest side is the least Democratic-leaning (D+11), a spread of about 14 points.
Why 91307 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 91307, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 90% of residents in 91307 live in densely developed areas, about 53 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 91307 sits in the top quarter (about 53%, above 91% of zip codes).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 91307, CA sits in the top quarter 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 91307 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 91307 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%. 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.