91206 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 60% of adults in 91206 typically vote, near the U.S. average of about 62%. Among adults in 91206, ~33% vote Democratic, ~27% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 91206 compares
Among zip codes within 15 miles, 91206 leans more Democratic than 6 of 139 neighbors.
91206 runs about 10 points more Republican than California as a whole.
Politics vary noticeably by block within 91206. The north side is the most Democratic-leaning (D+28) and the south side is the least Democratic-leaning (D+3), a spread of about 25 points.
Why 91206 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 91206, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 92% of residents in 91206 live in densely developed areas, about 55 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 91206 sits in the top quarter (about 49%, above 88% of zip codes).
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 91206, 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 91206 looks the way it does
Renters vote less often than owners. About 58% of households in 91206 rent, about 33 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 6% of homes in 91206 have more than one occupant per room, above 90% 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.