Pleasant Hill, CA Political Map | Democrat & Republican Areas in Pleasant Hill

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

Pleasant Hill leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.

 

About 74% of adults in Pleasant Hill typically vote, above the U.S. average of about 62%. Among adults in Pleasant Hill, ~52% vote Democratic, ~22% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.

How Pleasant Hill compares

Among cities within 25 miles, Pleasant Hill leans more Democratic than 38 of 68 neighbors.

Pleasant Hill runs about 21 points more Democratic than California as a whole.

Why Pleasant Hill 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 Pleasant Hill, not a ranked or complete list of what matters most.

Dense areas vote Democratic. About 99% of residents in Pleasant Hill live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Pleasant Hill sits in the top quarter (about 54%, above 95% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Pleasant Hill have never been married, above 80% of cities.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Pleasant Hill, CA sits in the top tenth nationally on this measure.

Why turnout in Pleasant Hill looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Pleasant Hill 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 73%, about 13 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Pleasant Hill have completed high school, above 80% of cities. 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.