90404 is a Democratic stronghold. About 79% of voters here vote Democratic and 21% Republican.
About 55% of adults in 90404 typically vote, below the U.S. average of about 62%. Among adults in 90404, ~44% vote Democratic, ~12% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How 90404 compares
Among zip codes within 15 miles, 90404 leans more Democratic than 108 of 125 neighbors.
90404 runs about 38 points more Democratic than California as a whole.
Politics vary noticeably by block within 90404. The west side is the most Democratic-leaning (D+65) and the east side is the least Democratic-leaning (D+54), a spread of about 11 points.
Why 90404 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 90404, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 90404 live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 90404 sits in the top quarter (about 62%, above 95% of zip codes). A high never-married share predicts Democratic voting, and about 48% of adults in 90404 have never been married, above 94% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 90404, CA sits in the top tenth nationally on this measure.
Why turnout in 90404 looks the way it does
Renters vote less often than owners. About 79% of households in 90404 rent, about 54 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 4% of homes in 90404 have more than one occupant per room, above 83% 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.