94551 leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 63% of adults in 94551 typically vote, near the U.S. average of about 62%. Among adults in 94551, ~37% vote Democratic, ~26% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How 94551 compares
Among zip codes within 15 miles, 94551 leans more Democratic than 2 of 13 neighbors.
Politically, 94551 sits close to the rest of California.
Politics vary noticeably by block within 94551. The south side is the most Democratic-leaning (D+28) and the west side is the least Democratic-leaning (D+8), a spread of about 21 points.
Why 94551 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 94551, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 79% of residents in 94551 live in densely developed areas, about 43 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94551 sits in the top quarter (about 49%, above 88% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 94551, CA sits in the top quarter nationally on this measure.
Why turnout in 94551 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 94551 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 69%, about 9 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.