95240 leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 48% of adults in 95240 typically vote, below the U.S. average of about 62%. Among adults in 95240, ~23% vote Democratic, ~25% Republican, and ~52% don't vote. The map below shows estimated turnout by block group.
How 95240 compares
Among zip codes within 15 miles, 95240 leans more Republican than 11 of 22 neighbors.
95240 runs about 26 points more Republican than California as a whole. California leans Democratic overall, while 95240 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 95240. The north side runs the most Democratic (D+3) and the southeast side runs the most Republican (R+31), a spread of about 34 points.
Why 95240 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 95240, not a ranked or complete list of what matters most.
95240 votes Republican even though it is densely developed (about 83%, well above the California average of 58%). State and regional patterns outweigh the Democratic lean that density usually predicts here. 95240 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; 95240, 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 95240 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 95240 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 50% of households in 95240 rent, compared to around 35% in nearby zip codes. High food insecurity lines up with lower turnout, and about 24% of adults in 95240 report food insecurity, above 88% 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.