Downers Grove leans Democratic by roughly 16 points: about 58% of voters vote Democratic and 42% Republican.
About 83% of adults in Downers Grove typically vote, above the U.S. average of about 62%. Among adults in Downers Grove, ~48% vote Democratic, ~35% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How Downers Grove compares
Among cities within 25 miles, Downers Grove leans more Democratic than 104 of 168 neighbors.
Downers Grove runs about 6 points more Democratic than Illinois as a whole.
Politics vary noticeably by neighborhood within Downers Grove. The east side is the most Democratic-leaning (D+23) and the south side is the least Democratic-leaning (D+10), a spread of about 13 points.
Why Downers Grove 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 Downers Grove, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 98% of residents in Downers Grove live in densely developed areas, about 62 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Downers Grove sits in the top quarter (about 58%, above 96% of cities).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Downers Grove, 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 Downers Grove looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Downers Grove 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 Downers Grove have completed high school, above 85% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Westmont, IL D+16
- Clarendon Hills, IL D+14
- Woodridge, IL D+18
- Darien, IL D+3
- Willowbrook, IL D+5
- Lisle, IL D+21
- Hinsdale, IL D+12
- Oak Brook, IL Even
- Oakbrook Terrace, IL D+15
- Burr Ridge, IL R+3
Cities with Similar Populations
- Tooele, UT R+40
- West Chester, OH R+9
- Port Arthur, TX D+31
- Hyattsville, MD D+57
- Blacksburg, VA D+38
- Delaware, OH R+7
- Lancaster, OH R+31
- Meridian, MS D+11
- Hoffman Estates, IL D+15
- Paramount, CA D+35
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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.