94940 leans heavily Democratic by roughly 32 points: about 66% of voters vote Democratic and 34% Republican.
About 57% of adults in 94940 typically vote, near the U.S. average of about 62%. Among adults in 94940, ~38% vote Democratic, ~19% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 94940 compares
Among zip codes within 15 miles, 94940 is the least Democratic-leaning.
94940 runs about 13 points more Democratic than California as a whole.
Why 94940 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 94940, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 49% of adults in 94940 hold a bachelor's degree, about 21 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 36% of adults in 94940 have never been married, above 81% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 94940, 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 94940 looks the way it does
Renters vote less often than owners. About 40% of households in 94940 rent, about 15 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and 94940 sits in the top quarter on routine-care measures. Crowded housing lines up with lower turnout, and about 7% of homes in 94940 have more than one occupant per room, above 91% 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.