Chapin is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 72% of adults in Chapin typically vote, above the U.S. average of about 62%. Among adults in Chapin, ~16% vote Democratic, ~56% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How Chapin compares
Among cities within 25 miles, Chapin leans more Republican than 29 of 59 neighbors.
Chapin runs about 67 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Chapin is one of the few Republican-leaning pockets.
Why Chapin 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 Chapin, not a ranked or complete list of what matters most.
Chapin votes against the grain of Illinois. Illinois leans Democratic overall, while Chapin runs about 67 points more Republican.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; Chapin, IL sits in the top quarter nationally on this measure.
Why turnout in Chapin looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in Chapin have completed high school, about 7 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Merritt, IL R+61
- Concord, IL R+57
- Riggston, IL R+62
- Exeter, IL R+62
- Bluffs, IL R+62
- Lynnville, IL R+50
- Arenzville, IL R+53
- Meredosia, IL R+56
- Jacksonville, IL R+13
Cities with Similar Populations
- Achille, OK R+70
- Klawock, AK R+13
- Woodford, SC R+28
- Chocorua, NH Even
- Coleridge, NE R+71
- Matthews, IN R+49
- Smithville Flats, NY R+37
- Botland, KY R+54
- Walpole, ME D+44
- Anchorville, MI R+47
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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.