90017 leans heavily Democratic by roughly 46 points: about 73% of voters vote Democratic and 27% Republican.
About 31% of adults in 90017 typically vote, below the U.S. average of about 62%. Among adults in 90017, ~23% vote Democratic, ~8% Republican, and ~69% don't vote. The map below shows estimated turnout by block group.
How 90017 compares
Among zip codes within 15 miles, 90017 leans more Democratic than 101 of 174 neighbors.
90017 runs about 26 points more Democratic than California as a whole.
Politics vary noticeably by block within 90017. The east side is the most Democratic-leaning (D+58) and the northwest side is the least Democratic-leaning (D+39), a spread of about 19 points.
Why 90017 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 90017, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 90017 live in densely developed areas, about 64 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 60% of adults in 90017 have never been married, above 98% of zip codes.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 90017, CA sits in the bottom tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 90017 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 90017 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 45%, about 17 points below the California average of 62%. Renters vote less often than owners, and about 96% of households in 90017 rent, about 71 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 40% of adults in 90017 report food insecurity, above 98% 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.