Rock City leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 76% of adults in Rock City typically vote, above the U.S. average of about 62%. Among adults in Rock City, ~22% vote Democratic, ~54% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How Rock City compares
Among cities within 25 miles, Rock City leans more Republican than 46 of 65 neighbors.
Rock City runs about 53 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Rock City is one of the few Republican-leaning pockets.
Why Rock City 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 City, not a ranked or complete list of what matters most.
Rock City votes against the grain of Illinois. Illinois leans Democratic overall, while Rock City runs about 53 points more Republican. A high family-household share predicts Republican voting, and about 79% of households in Rock City are family households, above 87% of cities.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Rock City, IL sits in the bottom tenth nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Rock City looks the way it does
Turnout in Rock City 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
- Dakota, IL R+44
- Davis, IL R+29
- Rock Grove, IL R+44
- Winneshiek, IL R+43
- Lake Summerset, IL R+40
- Ridott, IL R+44
- Durand, IL R+35
- Oakley, WI R+33
- Cedarville, IL R+37
- Pecatonica, IL R+34
Cities with Similar Populations
- Greshamville, GA R+57
- Loganville, WI R+36
- Lands End, SC R+6
- Ferndale, NY R+30
- Nicholsville, MI R+38
- Little Rock, IA R+68
- New Point, IN R+63
- Garfield, WA R+48
- Hodges, AL R+86
- Glennie, MI 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.