Deer Grove leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 89% of adults in Deer Grove typically vote, above the U.S. average of about 62%. Among adults in Deer Grove, ~27% vote Democratic, ~62% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Deer Grove compares
Among cities within 25 miles, Deer Grove leans more Republican than 31 of 58 neighbors.
Deer Grove runs about 50 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Deer Grove is one of the few Republican-leaning pockets.
Why Deer 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 Deer Grove, not a ranked or complete list of what matters most.
Deer Grove votes against the grain of Illinois. Illinois leans Democratic overall, while Deer Grove runs about 50 points more Republican.
Population density and Republican lean
Places with low population density tend to lean Republican; Deer Grove, IL sits in the bottom quarter nationally on this measure.
Why turnout in Deer Grove looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in Deer Grove 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
- Tampico, IL R+42
- Walnut, IL R+44
- Yeoward Addition, IL R+39
- New Bedford, IL R+46
- Harmon, IL R+28
- Como, IL R+37
- Yorktown, IL R+46
- Rock Falls, IL R+16
- Thomas, IL R+47
- Manlius, IL R+48
Cities with Similar Populations
- Newburg, IL R+51
- Hillview, IL R+65
- Allegre, KY R+69
- Hannibal, WI R+48
- Lakeside, NE R+78
- Hibbard, IN R+46
- Antoine, AR R+36
- Rockwood, ME R+30
- Thomaston, IN R+45
- Catherine, AL D+63
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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.