95903 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 32% of adults in 95903 typically vote, below the U.S. average of about 62%. Among adults in 95903, ~15% vote Democratic, ~18% Republican, and ~67% don't vote. The map below shows estimated turnout by block group.
How 95903 compares
Among zip codes within 15 miles, 95903 leans more Republican than 1 of 10 neighbors.
95903 runs about 30 points more Republican than California as a whole. California leans Democratic overall, while 95903 is one of the few Republican-leaning pockets.
Why 95903 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 95903, not a ranked or complete list of what matters most.
95903 votes against the grain of California. California leans Democratic overall, while 95903 runs about 30 points more Republican.
Renting and voter turnout
Places with renter-heavy households tend to turn out at a lower rate; 95903, CA sits in the top tenth nationally on this measure.
Why turnout in 95903 looks the way it does
Renters vote less often than owners. About 96% of households in 95903 rent, about 71 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 99% of adults in 95903 have completed high school, above 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.