Mount Hamilton, CA Political Map | Democrat & Republican Areas in Mount Hamilton

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

Mount Hamilton leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.

 

About 54% of adults in Mount Hamilton typically vote, below the U.S. average of about 62%. Among adults in Mount Hamilton, ~30% vote Democratic, ~24% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.

How Mount Hamilton compares

Among cities within 25 miles, Mount Hamilton leans more Democratic than 3 of 31 neighbors.

Mount Hamilton runs about 10 points more Republican than California as a whole.

Politics vary noticeably by neighborhood within Mount Hamilton. The northwest side runs the most Democratic (D+18) and the southeast side runs the most Republican (R+16), a spread of about 34 points.

Why Mount Hamilton leans the way it does

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

Areas with high college attainment vote Democratic. About 55% of adults in Mount Hamilton hold a bachelor's degree, about 26 points above the U.S. average of 28%. Dense areas vote Democratic, and Mount Hamilton sits in the top fifth on density (about 37%, above 83% of cities).

Population density and Democratic lean

Places with high population density tend to lean Democratic; Mount Hamilton, CA sits in the top quarter nationally on this measure.

Why turnout in Mount Hamilton looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Mount Hamilton 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.

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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.