Willowbrook leans slightly Democratic by roughly 6 points: about 53% of voters vote Democratic and 47% Republican.
About 71% of adults in Willowbrook typically vote, above the U.S. average of about 62%. Among adults in Willowbrook, ~37% vote Democratic, ~33% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How Willowbrook compares
Among cities within 25 miles, Willowbrook leans more Democratic than 57 of 169 neighbors.
Willowbrook runs about 6 points more Republican than Illinois as a whole.
Politics vary noticeably by neighborhood within Willowbrook. The northwest side runs the most Democratic (D+12) and the southeast side runs the most Republican (R+4), a spread of about 16 points.
Why Willowbrook 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 Willowbrook, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in Willowbrook live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Willowbrook sits in the top quarter (about 52%, above 94% of cities). A high never-married share predicts Democratic voting, and about 30% of adults in Willowbrook have never been married, above 75% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Willowbrook, IL sits in the top tenth 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 Willowbrook looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Willowbrook 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 72%, about 12 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Hinsdale, IL D+12
- Burr Ridge, IL R+3
- Clarendon Hills, IL D+14
- Darien, IL D+3
- Westmont, IL D+16
- Indian Head Park, IL D+13
- Western Springs, IL D+21
- Downers Grove, IL D+17
- Countryside, IL D+3
- Willow Springs, IL R+12
Cities with Similar Populations
- Greenville, AL D+4
- Beverly Hills, FL R+27
- Hebron, IN R+35
- Essexville, MI R+15
- Jarrell, TX R+27
- Tuttle, OK R+63
- Wheelersburg, OH R+51
- Jerseyville, IL R+43
- Bedford Heights, OH D+77
- Gardiner, ME R+16
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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.