94501 is a Democratic stronghold. About 81% of voters here vote Democratic and 19% Republican.
About 63% of adults in 94501 typically vote, near the U.S. average of about 62%. Among adults in 94501, ~51% vote Democratic, ~12% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How 94501 compares
Among zip codes within 15 miles, 94501 leans more Democratic than 53 of 91 neighbors.
94501 runs about 42 points more Democratic than California as a whole.
Politics vary noticeably by block within 94501. The west side is the most Democratic-leaning (D+69) and the northwest side is the least Democratic-leaning (D+48), a spread of about 21 points.
Why 94501 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 94501, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 89% of residents in 94501 live in densely developed areas, about 53 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 94501 sits in the top quarter (about 59%, above 94% of zip codes). A high never-married share predicts Democratic voting, and about 34% of adults in 94501 have never been married, above 76% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 94501, CA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 94501 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 94501 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.