91205 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 47% of adults in 91205 typically vote, below the U.S. average of about 62%. Among adults in 91205, ~27% vote Democratic, ~20% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How 91205 compares
Among zip codes within 15 miles, 91205 leans more Democratic than 11 of 145 neighbors.
91205 runs about 5 points more Republican than California as a whole.
Politics vary noticeably by block within 91205. The southeast side is the most Democratic-leaning (D+36) and the west side is the least Democratic-leaning (D+10), a spread of about 26 points.
Why 91205 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 91205, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 91205 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 91205 sits in the top quarter (about 38%, above 79% of zip codes). A high never-married share predicts Democratic voting, and about 41% of adults in 91205 have never been married, above 88% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 91205, 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 91205 looks the way it does
Renters vote less often than owners. About 81% of households in 91205 rent, about 56 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 13% of homes in 91205 have more than one occupant per room, above 98% 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.