92028 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 61% of adults in 92028 typically vote, near the U.S. average of about 62%. Among adults in 92028, ~27% vote Democratic, ~34% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How 92028 compares
Among zip codes within 15 miles, 92028 leans more Republican than 9 of 16 neighbors.
92028 runs about 29 points more Republican than California as a whole. California leans Democratic overall, while 92028 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 92028. The west side runs the most Democratic (D+9) and the northeast side runs the most Republican (R+23), a spread of about 33 points.
Why 92028 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 92028, not a ranked or complete list of what matters most.
92028 votes Republican even though it is densely developed (about 67%, modestly above the California average of 58%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 79% of households in 92028 are family households, above 90% of zip codes. 92028 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 92028, CA does.
Why turnout in 92028 looks the way it does
Crowded housing lines up with lower turnout. About 10% of homes in 92028 have more than one occupant per room, above 96% of zip codes. Low high-school completion lines up with lower turnout, and about 86% of adults in 92028 have completed high school, below 76% 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.