Windsor Shelby County is a Republican stronghold. About 19% of voters here vote Democratic and 81% Republican.
About 79% of adults in Windsor Shelby County typically vote, above the U.S. average of about 62%. Among adults in Windsor Shelby County, ~15% vote Democratic, ~64% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How Windsor Shelby County compares
Among cities within 25 miles, Windsor Shelby County leans more Republican than 35 of 63 neighbors.
Windsor Shelby County runs about 72 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Windsor Shelby County is one of the few Republican-leaning pockets.
Why Windsor Shelby 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 Shelby County, not a ranked or complete list of what matters most.
Windsor Shelby County votes against the grain of Illinois. Illinois leans Democratic overall, while Windsor Shelby County runs about 72 points more Republican. Car-dependent areas vote Republican, and about 85% of residents in Windsor Shelby County drive to work alone, above 80% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Windsor Shelby County, IL sits above the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Windsor Shelby County looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in Windsor Shelby County have completed high school, about 5 points above the Illinois average of 92%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Bruce, IL R+57
- Strasburg, IL R+64
- Gays, IL R+61
- Middlesworth, IL R+66
- Duvall, IL R+63
- Findlay, IL R+61
- Kirksville, IL R+47
- Allenville, IL R+60
- Paradise, IL R+59
- Trowbridge, IL R+67
Cities with Similar Populations
- Salisbury, VT R+3
- Erhard, MN R+42
- Key Center, WA R+3
- Wood River Junction, RI R+11
- Miner, MO R+55
- Allensville, PA R+74
- Sageeyah, OK R+58
- Tremont City, OH R+46
- Vienna, MO R+66
- Borculo, MI R+39
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.