92004 leans slightly Republican by roughly 14 points: about 43% of voters vote Democratic and 57% Republican.
About 47% of adults in 92004 typically vote, below the U.S. average of about 62%. Among adults in 92004, ~20% vote Democratic, ~27% Republican, and ~53% don't vote. The map below shows estimated turnout by block group.
How 92004 compares
92004 runs about 34 points more Republican than California as a whole. California leans Democratic overall, while 92004 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 92004. The southeast side is the most Republican-leaning (R+35) and the north side is the least Republican-leaning (R+3), a spread of about 32 points.
Why 92004 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 92004, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in 92004 live in densely developed areas, about 53 points below the California average of 58%. 92004 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Republican lean
Places with low population density tend to lean Republican; 92004, CA sits in the bottom quarter nationally on this measure.
Why turnout in 92004 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 92004 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 66%, about 6 points above the U.S. average of 60%. 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.