Macoupin County leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 77% of adults in Macoupin County typically vote, above the U.S. average of about 62%. Among adults in Macoupin County, ~22% vote Democratic, ~55% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Macoupin County compares
Among counties within 50 miles, Macoupin County leans more Republican than 7 of 15 neighbors.
Macoupin County runs about 53 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Macoupin County is one of the few Republican-leaning pockets.
Politics vary noticeably by city within Macoupin County. The northwest side is the most Republican-leaning (R+58) and the southeast side is the least Republican-leaning (R+37), a spread of about 21 points.
Why Macoupin 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 Macoupin County, not a ranked or complete list of what matters most.
Macoupin County votes against the grain of Illinois. Illinois leans Democratic overall, while Macoupin County runs about 53 points more Republican.
Renting and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; Macoupin County, IL sits below the national average on this measure.
Why turnout in Macoupin County looks the way it does
Turnout in Macoupin County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Montgomery County, IL R+44
- Jersey County, IL R+44
- Madison County, IL R+11
- Greene County, IL R+56
- Bond County, IL R+39
- Christian County, IL R+45
- Morgan County, IL R+25
- Calhoun County, IL R+56
- Sangamon County, IL Even
- Scott County, IL R+64
Counties with Similar Populations
- Polk County, WI R+33
- Lawrence County, IN R+51
- Washington County, MS D+48
- Chilton County, AL R+69
- Itasca County, MN R+22
- Shelby County, IN R+47
- Branch County, MI R+38
- Wood County, TX R+68
- Henderson County, KY R+33
- Bryan County, GA R+35
All Local Stats
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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.