91361 leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.
About 75% of adults in 91361 typically vote, above the U.S. average of about 62%. Among adults in 91361, ~42% vote Democratic, ~33% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 91361 compares
Among zip codes within 15 miles, 91361 leans more Democratic than 10 of 22 neighbors.
91361 runs about 8 points more Republican than California as a whole.
Politics vary noticeably by block within 91361. The east side is the most Democratic-leaning (D+22) and the west side is the least Democratic-leaning (Even), a spread of about 21 points.
Why 91361 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 91361, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 61% of adults in 91361 hold a bachelor's degree, about 32 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in 91361 is about 72%, below 65% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 91361, CA sits in the top 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 91361 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 91361 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in 91361 have completed high school, above 92% 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.