Union Grove leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 82% of adults in Union Grove typically vote, above the U.S. average of about 62%. Among adults in Union Grove, ~25% vote Democratic, ~57% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How Union Grove compares
Among cities within 25 miles, Union Grove leans more Republican than 29 of 61 neighbors.
Union Grove runs about 48 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Union Grove is one of the few Republican-leaning pockets.
Why Union Grove 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 Union Grove, not a ranked or complete list of what matters most.
Union Grove votes against the grain of Illinois. Illinois leans Democratic overall, while Union Grove runs about 48 points more Republican.
Food insecurity and voter turnout
Places with low food insecurity tend to turn out at a higher rate; Union Grove, IL sits in the bottom quarter nationally on this measure. Food insecurity does not directly drive turnout; it reflects economic hardship, which lines up with lower voting.
Why turnout in Union Grove looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in Union Grove have completed high school, about 6 points above the U.S. average of 90%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Morrison, IL R+31
- Fulton, IL R+27
- Garden Plain, IL R+43
- Fair Haven, IL R+37
- Clinton, IA R+8
- Thomson, IL R+38
- Fenton, IL R+50
- Round Grove, IL R+37
- Lyons, IA R+39
- Albany, IL R+37
Cities with Similar Populations
- East Jewett, NY R+7
- Delchamps, AL R+82
- Nobob, KY R+66
- South Mound, KS R+66
- Chamberlin, LA R+33
- Jarrott, FL R+23
- Fifty Lakes, MN R+28
- Pleasant View, WV R+70
- Napi Headquarters, NM R+2
- Harding, IL R+43
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.