Greenville leans Republican by roughly 28 points: about 36% of voters vote Democratic and 64% Republican.
About 63% of adults in Greenville typically vote, near the U.S. average of about 62%. Among adults in Greenville, ~23% vote Democratic, ~40% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How Greenville compares
Among cities within 25 miles, Greenville leans more Republican than 2 of 63 neighbors.
Greenville runs about 39 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Greenville is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Greenville. The northwest side is the most Republican-leaning (R+46) and the south side is the least Republican-leaning (R+27), a spread of about 19 points.
Why Greenville 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 Greenville, not a ranked or complete list of what matters most.
Greenville votes Republican even though it is densely developed (about 58%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Greenville 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; Greenville, IL sits in the top tenth nationally on this measure.
Why turnout in Greenville looks the way it does
Turnout in Greenville sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Woburn, IL R+42
- Stubblefield, IL R+53
- Dudleyville, IL R+61
- Smithboro, IL R+51
- Reno, IL R+55
- Mulberry Grove, IL R+44
- Pleasant Mound, IL R+63
- Old Ripley, IL R+54
- Beaver Creek, IL R+61
- Donnellson, IL R+49
Cities with Similar Populations
- Milliken, CO R+35
- Ladue, MO D+7
- Mayo, MD R+11
- Silver Springs, FL R+47
- Yarmouth, ME D+35
- Mecca, CA D+26
- Dagsboro, DE R+22
- La Junta, CO R+13
- Roanoke, AL R+37
- Harrington, DE R+26
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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.