Greene County is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 73% of adults in Greene County typically vote, above the U.S. average of about 62%. Among adults in Greene County, ~16% vote Democratic, ~57% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How Greene County compares
Among counties within 50 miles, Greene County leans more Republican than 12 of 14 neighbors.
Greene County runs about 67 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Greene County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Greene County. The southeast side is the most Republican-leaning (R+66) and the north side is the least Republican-leaning (R+43), a spread of about 23 points.
Why Greene County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Greene County, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In Greene County, about 96% of residents are non-Hispanic white, about 23 points above the U.S. average of 72%; about 19% of adults hold a bachelor's degree, about 8 points below the Illinois average of 27%. Greene County runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Greene County, IL sits below the national average on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Greene County looks the way it does
Turnout in Greene County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Scott County, IL R+64
- Jersey County, IL R+44
- Calhoun County, IL R+56
- Morgan County, IL R+25
- Macoupin County, IL R+42
- Pike County, IL R+57
- Lincoln County, MO R+51
- Pike County, MO R+55
- Cass County, IL R+31
- Madison County, IL R+11
Counties with Similar Populations
- Morris County, TX R+39
- Prowers County, CO R+38
- Summers County, WV R+52
- Chickasaw County, IA R+40
- Lawrence County, MS R+30
- Little River County, AR R+45
- Washington County, KY R+58
- Lunenburg County, VA R+24
- Lyon County, IA R+65
- Skamania County, WA R+13
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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.