Stillman Valley leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 81% of adults in Stillman Valley typically vote, above the U.S. average of about 62%. Among adults in Stillman Valley, ~27% vote Democratic, ~55% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Stillman Valley compares
Among cities within 25 miles, Stillman Valley leans more Republican than 28 of 65 neighbors.
Stillman Valley runs about 44 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Stillman Valley is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Stillman Valley. The east side is the most Republican-leaning (R+40) and the north side is the least Republican-leaning (R+28), a spread of about 12 points.
Why Stillman Valley 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 Stillman Valley, not a ranked or complete list of what matters most.
Stillman Valley votes against the grain of Illinois. Illinois leans Democratic overall, while Stillman Valley runs about 44 points more Republican. A high family-household share predicts Republican voting, and about 79% of households in Stillman Valley are family households, above 88% of cities.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Stillman Valley, IL sits in the top tenth nationally 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 Stillman Valley looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Stillman Valley is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 71%, about 11 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Stillman Valley own their home, about 17 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 96% of adults in Stillman Valley have completed high school, above 86% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Byron, IL R+26
- Davis Junction, IL R+33
- White Rock, IL R+37
- Myrtle, IL R+35
- Holcomb, IL R+34
- Morristown, IL R+33
- New Milford, IL R+21
- Chana, IL R+39
- Monroe Center, IL R+41
- Oregon, IL R+24
Cities with Similar Populations
- Galliano, LA R+79
- Wintersville, OH R+28
- Laurel Hill, NC R+34
- Sleepy Eye, MN R+46
- South Haven, MN R+48
- Lancaster, VA R+15
- Oxford, NY R+39
- South Charleston, OH R+56
- Heath Springs, SC R+41
- Claysville, PA R+51
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.