94556 leans heavily Democratic by roughly 50 points: about 75% of voters vote Democratic and 25% Republican.
About 61% of adults in 94556 typically vote, near the U.S. average of about 62%. Among adults in 94556, ~46% vote Democratic, ~15% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How 94556 compares
Among zip codes within 15 miles, 94556 leans more Democratic than 33 of 70 neighbors.
94556 runs about 29 points more Democratic than California as a whole.
Politics vary noticeably by block within 94556. The west side is the most Democratic-leaning (D+59) and the southeast side is the least Democratic-leaning (D+36), a spread of about 23 points.
Why 94556 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 94556, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 81% of adults in 94556 hold a bachelor's degree, about 52 points above the U.S. average of 28%.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 94556, CA sits above the national average on this measure.
Why turnout in 94556 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 94556 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 77%, about 17 points above the U.S. average of 60%. 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.