Thornton, IL Political Map | Democrat & Republican Areas in Thornton

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

Thornton leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.

 

About 65% of adults in Thornton typically vote, near the U.S. average of about 62%. Among adults in Thornton, ~42% vote Democratic, ~23% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.

How Thornton compares

Among cities within 25 miles, Thornton leans more Democratic than 82 of 129 neighbors.

Thornton runs about 17 points more Democratic than Illinois as a whole.

Politics vary noticeably by neighborhood within Thornton. The south side is the most Democratic-leaning (D+55) and the northeast side is the least Democratic-leaning (D+20), a spread of about 35 points.

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

Dense areas vote Democratic. About 36% of residents in Thornton live in densely developed areas, above 83% of cities. A high never-married share predicts Democratic voting, and about 39% of adults in Thornton have never been married, above 93% of cities.

Park access and Democratic lean

Places with heavy park coverage tend to lean Democratic; Thornton, IL sits in the top tenth nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.

Why turnout in Thornton looks the way it does

Turnout in Thornton 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 Illinois State Board of 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.