Windsor Mercer County leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 75% of adults in Windsor Mercer County typically vote, above the U.S. average of about 62%. Among adults in Windsor Mercer County, ~25% vote Democratic, ~50% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Windsor Mercer County compares
Among cities within 25 miles, Windsor Mercer County leans more Republican than 32 of 68 neighbors.
Windsor Mercer County runs about 42 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Windsor Mercer County is one of the few Republican-leaning pockets.
Why Windsor Mercer County 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 Windsor Mercer County, not a ranked or complete list of what matters most.
Windsor Mercer County votes against the grain of Illinois. Illinois leans Democratic overall, while Windsor Mercer County runs about 42 points more Republican.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Windsor Mercer County, IL sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Windsor Mercer County looks the way it does
Homeowners vote more often than renters. About 90% of households in Windsor Mercer County own their home, about 11 points above the Illinois average of 80%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- New Windsor, IL R+31
- Alpha, IL R+34
- Opheim, IL R+36
- Viola, IL R+27
- North Henderson, IL R+31
- Sherrard, IL R+29
- Cable, IL R+30
- Lynn Center, IL R+36
- Rio, IL R+39
- Swedona, IL R+37
Cities with Similar Populations
- Estabrook Settlement, ME R+45
- Altonah, UT R+83
- Nashville, OR D+9
- Peniel, TX R+52
- Perry Store, AL R+90
- High Point, IA R+60
- Fulmer Valley, NY R+40
- Independence, NY R+47
- Slovak, AR R+81
- Wasta, SD R+76
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.