Bloomington, CA Political Map | Democrat & Republican Areas in Bloomington

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

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

 

About 38% of adults in Bloomington typically vote, below the U.S. average of about 62%. Among adults in Bloomington, ~21% vote Democratic, ~17% Republican, and ~62% don't vote. The map below shows estimated turnout by block group.

How Bloomington compares

Among cities within 25 miles, Bloomington leans more Democratic than 54 of 66 neighbors.

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

Politics vary noticeably by neighborhood within Bloomington. The north side is the most Democratic-leaning (D+16) and the east side is the least Democratic-leaning (D+2), a spread of about 14 points.

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

Dense areas vote Democratic. About 96% of residents in Bloomington live in densely developed areas, about 60 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 43% of adults in Bloomington have never been married, above 96% of cities.

Preventive-care access and voter turnout

Places with limited routine preventive-care access tend to turn out at a lower rate; Bloomington, CA sits in the bottom quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Bloomington looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Bloomington is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 50%, about 12 points below the California average of 62%. High food insecurity lines up with lower turnout, and about 30% of adults in Bloomington report food insecurity, above 95% of cities. Low high-school completion lines up with lower turnout, and about 67% of adults in Bloomington have completed high school, in the bottom fraction 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.