Rock Grove leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 78% of adults in Rock Grove typically vote, above the U.S. average of about 62%. Among adults in Rock Grove, ~22% vote Democratic, ~56% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How Rock Grove compares
Among cities within 25 miles, Rock Grove leans more Republican than 52 of 64 neighbors.
Rock Grove runs about 55 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Rock Grove is one of the few Republican-leaning pockets.
Why Rock 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 Rock Grove, not a ranked or complete list of what matters most.
Rock Grove votes against the grain of Illinois. Illinois leans Democratic overall, while Rock Grove runs about 55 points more Republican.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; Rock Grove, IL sits in the bottom quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in Rock Grove looks the way it does
Turnout in Rock Grove sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Rock City, IL R+42
- Dakota, IL R+44
- Oakley, WI R+33
- Davis, IL R+29
- Lake Summerset, IL R+40
- Twin Grove, WI R+36
- Orangeville, IL R+43
- Juda, WI R+34
- Winneshiek, IL R+43
- Buena Vista, IL R+45
Cities with Similar Populations
- West Farm, CO R+62
- Vaughan, TX R+74
- Millers Ferry, AL R+42
- Garwoods, NY R+50
- Connor, ID R+83
- Majenica, IN R+60
- Patesville, KY R+63
- West Burlington, PA R+63
- Java, SD R+78
- Fort Green Springs, FL R+62
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.