95721 leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 73% of adults in 95721 typically vote, above the U.S. average of about 62%. Among adults in 95721, ~34% vote Democratic, ~39% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How 95721 compares
Among zip codes within 15 miles, 95721 leans more Republican than 4 of 8 neighbors.
95721 runs about 25 points more Republican than California as a whole. California leans Democratic overall, while 95721 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 95721. The northeast side runs the most Democratic (D+12) and the southwest side runs the most Republican (R+18), a spread of about 30 points.
Why 95721 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 95721, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 3% of residents in 95721 live in densely developed areas, about 55 points below the California average of 58%. A high family-household share predicts Republican voting, and more than 99% of households in 95721 are family households, in the top fraction of zip codes. 95721 runs against the grain of California, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 95721, CA sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 95721 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 95721 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 70%, about 10 points above the U.S. average of 60%. Homeowners vote more often than renters, and more than 99% of households in 95721 own their home, compared to around 77% in nearby zip codes. High high-school completion lines up with higher turnout, and more than 99% of adults in 95721 have completed high school, in the top fraction 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.