91775 leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 59% of adults in 91775 typically vote, near the U.S. average of about 62%. Among adults in 91775, ~36% vote Democratic, ~23% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.
How 91775 compares
Among zip codes within 15 miles, 91775 leans more Democratic than 39 of 119 neighbors.
Politically, 91775 sits close to the rest of California.
Politics vary noticeably by block within 91775. The west side is the most Democratic-leaning (D+29) and the east side is the least Democratic-leaning (D+16), a spread of about 13 points.
Why 91775 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 91775, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 91775 live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 91775 sits in the top quarter (about 53%, above 91% of zip codes).
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 91775, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 91775 looks the way it does
Crowded housing lines up with lower turnout. About 6% of homes in 91775 have more than one occupant per room, above 89% of zip codes. Renters vote less often than owners, and about 36% of households in 91775 rent, above 83% 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.