91902 leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 77% of adults in 91902 typically vote, above the U.S. average of about 62%. Among adults in 91902, ~42% vote Democratic, ~35% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How 91902 compares
Among zip codes within 15 miles, 91902 leans more Democratic than 10 of 49 neighbors.
91902 runs about 12 points more Republican than California as a whole.
Politics vary noticeably by block within 91902. The southwest side is the most Democratic-leaning (D+13) and the northeast side is the least Democratic-leaning (Even), a spread of about 13 points.
Why 91902 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 91902, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 92% of residents in 91902 live in densely developed areas, about 56 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 91902 sits in the top quarter (about 43%, above 84% of zip codes).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 91902, 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 91902 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 91902 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 69%, about 9 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.