Chillicothe leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 90% of adults in Chillicothe typically vote, above the U.S. average of about 62%. Among adults in Chillicothe, ~36% vote Democratic, ~54% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.
How Chillicothe compares
Among cities within 25 miles, Chillicothe leans more Republican than 8 of 76 neighbors.
Chillicothe runs about 31 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Chillicothe is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Chillicothe. The northwest side is the most Republican-leaning (R+33) and the northeast side is the least Republican-leaning (R+12), a spread of about 21 points.
Why Chillicothe 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 Chillicothe, not a ranked or complete list of what matters most.
Chillicothe votes Republican even though it is densely developed (about 40%, modestly above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Chillicothe runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Chillicothe, IL sits in the top quarter nationally on this measure.
Why turnout in Chillicothe looks the way it does
High high-school completion lines up with higher turnout, and about 96% of adults in Chillicothe have completed high school, above 81% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Rome, IL R+25
- North Hampton, IL R+34
- Spring Bay, IL R+42
- West Hallock, IL R+34
- Edelstein, IL R+33
- Mossville, IL R+9
- Bay View Gardens, IL R+38
- Lawn Ridge, IL R+40
- Oak Ridge, IL R+32
Cities with Similar Populations
- Marathon, FL R+24
- Rupert, ID R+54
- Tyrone, GA R+4
- Hughson, CA R+33
- Cross Lanes, WV R+25
- Madison, NC R+49
- Edwards, CO D+22
- Sedona, AZ D+13
- Gunnison, CO D+23
- Vicksburg, MI R+18
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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.