Grass Valley, CA Political Map | Democrat & Republican Areas in Grass Valley

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

Grass Valley is a true toss-up. About 52% of voters here vote Democratic and 48% Republican.

 

About 80% of adults in Grass Valley typically vote, above the U.S. average of about 62%. Among adults in Grass Valley, ~42% vote Democratic, ~38% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.

How Grass Valley compares

Among cities within 25 miles, Grass Valley leans more Democratic than 47 of 53 neighbors.

Grass Valley runs about 16 points more Republican than California as a whole.

Politics vary noticeably by neighborhood within Grass Valley. The north side runs the most Democratic (D+20) and the southwest side runs the most Republican (R+12), a spread of about 32 points.

Why Grass Valley leans the way it does

Density, race composition, education, and family structure all sit close to their national averages in Grass Valley. The lean here lands roughly where demographic data alone would predict.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Grass Valley, CA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.

Why turnout in Grass Valley looks the way it does

Turnout in Grass Valley sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.

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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.