Chambersburg is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 74% of adults in Chambersburg typically vote, above the U.S. average of about 62%. Among adults in Chambersburg, ~16% vote Democratic, ~58% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Chambersburg compares
Among cities within 25 miles, Chambersburg leans more Republican than 17 of 54 neighbors.
Chambersburg runs about 69 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Chambersburg is one of the few Republican-leaning pockets.
Why Chambersburg 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 Chambersburg, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 5% of residents in Chambersburg live in densely developed areas, about 28 points below the Illinois average of 33%. Chambersburg runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Republican lean
Places with low population density tend to lean Republican; Chambersburg, IL sits in the bottom quarter nationally on this measure.
Why turnout in Chambersburg looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in Chambersburg 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
- Perry, IL R+59
- Naples, IL R+62
- Versailles, IL R+60
- Meredosia, IL R+56
- Valley City, IL R+64
- Griggsville, IL R+62
- Bluffs, IL R+62
- Maysville, IL R+60
- Cooperstown, IL R+60
- Hersman, IL R+32
Cities with Similar Populations
- Stark, IL R+55
- Kinbrae, MN R+52
- Kabob, NY R+40
- Rainswood, VA R+30
- McCoysville, PA R+67
- Bullock, AL R+69
- Tampico, MT R+61
- McKinnon, WY R+79
- Talpa, TX R+81
- Miguel, TX R+45
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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.