North Valley, San Jose, CA Political Map | Democrat & Republican Areas in North Valley

By the BestNeighborhood data science team. Last updated May 2026.

North Valley leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.

 

About 43% of adults in North Valley typically vote, below the U.S. average of about 62%. Among adults in North Valley, ~27% vote Democratic, ~16% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.

How North Valley compares

Among neighborhoods within 5 miles, North Valley leans more Democratic than 1 of 9 neighbors.

North Valley runs about 7 points more Democratic than California as a whole.

Why North Valley leans the way it does

This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for North Valley, not a ranked or complete list of what matters most.

Dense areas vote Democratic. More than 99% of residents in North Valley live in densely developed areas, about 64 points above the U.S. average of 36%.

Population density and Democratic lean

Places with high population density tend to lean Democratic; North Valley, San Jose, CA sits in the top tenth nationally on this measure.

Why turnout in North Valley looks the way it does

Crowded housing lines up with lower turnout. About 12% of homes in North Valley have more than one occupant per room, above 94% of neighborhoods. Low high-school completion lines up with lower turnout, and about 82% of adults in North Valley have completed high school, below 82% of neighborhoods. Learn more about the findings and methodology on the political spectrum map.

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.