Warrenville leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 69% of adults in Warrenville typically vote, above the U.S. average of about 62%. Among adults in Warrenville, ~39% vote Democratic, ~30% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How Warrenville compares
Among cities within 25 miles, Warrenville leans more Democratic than 105 of 156 neighbors.
Politically, Warrenville sits close to the rest of Illinois.
Politics vary noticeably by neighborhood within Warrenville. The south side runs the most Democratic (D+19) and the northeast side runs the most Republican (Even), a spread of about 20 points.
Why Warrenville 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 Warrenville, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 82% of residents in Warrenville live in densely developed areas, about 46 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Warrenville sits in the top quarter (about 47%, above 92% of cities). A high never-married share predicts Democratic voting, and about 32% of adults in Warrenville have never been married, above 80% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Warrenville, IL sits in the top 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 Warrenville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Warrenville 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 69%, about 9 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Winfield, IL D+6
- Wayne Center, IL D+10
- West Chicago, IL D+9
- Eola, IL D+29
- Wheaton, IL D+21
- Naperville, IL D+21
- Lisle, IL D+21
- Batavia, IL D+15
- Carol Stream, IL D+10
- Aurora, IL D+29
Cities with Similar Populations
- Highland Park, NJ D+45
- North Bend, WA D+21
- Escanaba, MI R+11
- Safford, AZ R+44
- Whitefish Bay, WI D+43
- South Venice, FL R+26
- El Campo, TX R+33
- Buckley, WA R+26
- Whitehouse, TX R+59
- Hollidaysburg, PA R+31
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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.