94020 is a Democratic stronghold. About 77% of voters here vote Democratic and 23% Republican.
About 48% of adults in 94020 typically vote, below the U.S. average of about 62%. Among adults in 94020, ~37% vote Democratic, ~11% Republican, and ~52% don't vote. The map below shows estimated turnout by block group.
How 94020 compares
Among zip codes within 15 miles, 94020 leans more Democratic than 25 of 31 neighbors.
94020 runs about 33 points more Democratic than California as a whole.
Why 94020 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 94020, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 62% of adults in 94020 hold a bachelor's degree, about 33 points above the U.S. average of 28%.
Park access and Democratic lean
Places with heavy park coverage tend to lean Democratic; 94020, CA sits above the national average on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in 94020 looks the way it does
Areas with low high-school completion turn out at lower rates. About 87% of adults in 94020 have completed high school, below 75% of zip codes. Strong routine healthcare access lines up with higher turnout, and 94020 sits in the top quarter on routine-care measures. Crowded housing lines up with lower turnout, and about 6% of homes in 94020 have more than one occupant per room, above 90% 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.