95231 leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 25% of adults in 95231 typically vote, below the U.S. average of about 62%. Among adults in 95231, ~12% vote Democratic, ~13% Republican, and ~75% don't vote. The map below shows estimated turnout by block group.
How 95231 compares
Among zip codes within 15 miles, 95231 leans more Republican than 14 of 20 neighbors.
95231 runs about 26 points more Republican than California as a whole. California leans Democratic overall, while 95231 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 95231. The southwest side runs the most Democratic (D+3) and the southeast side runs the most Republican (R+24), a spread of about 27 points.
Why 95231 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 95231, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 11% of adults in 95231 hold a bachelor's degree, about 24 points below the California average of 35%. A high family-household share predicts Republican voting, and about 74% of households in 95231 are family households, above 75% of zip codes. 95231 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 95231, CA sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 95231 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 95231 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 47%, about 15 points below the California average of 62%. High food insecurity lines up with lower turnout, and about 27% of adults in 95231 report food insecurity, above 91% of zip codes. Low high-school completion lines up with lower turnout, and about 71% of adults in 95231 have completed high school, below 97% 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.