92021 leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 56% of adults in 92021 typically vote, below the U.S. average of about 62%. Among adults in 92021, ~24% vote Democratic, ~32% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How 92021 compares
Among zip codes within 15 miles, 92021 leans more Republican than 35 of 39 neighbors.
92021 runs about 34 points more Republican than California as a whole. California leans Democratic overall, while 92021 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 92021. The northeast side is the most Republican-leaning (R+32) and the southwest side is the least Republican-leaning (R+5), a spread of about 27 points.
Why 92021 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 92021, not a ranked or complete list of what matters most.
92021 votes Republican even though it is densely developed (about 86%, well above the California average of 58%). State and regional patterns outweigh the Democratic lean that density usually predicts here. 92021 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as 92021, CA does.
Why turnout in 92021 looks the way it does
Areas with high food insecurity turn out at lower rates. About 21% of adults in 92021 report food insecurity, above 81% of zip codes. Renters vote less often than owners, and about 45% of households in 92021 rent, about 20 points above the U.S. average of 25%. 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.