Green Rock leans Republican by roughly 22 points: about 39% of voters vote Democratic and 61% Republican.
About 79% of adults in Green Rock typically vote, above the U.S. average of about 62%. Among adults in Green Rock, ~31% vote Democratic, ~48% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How Green Rock compares
Among cities within 25 miles, Green Rock leans more Republican than 17 of 73 neighbors.
Green Rock runs about 32 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Green Rock is one of the few Republican-leaning pockets.
Why Green Rock 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 Green Rock, not a ranked or complete list of what matters most.
Green Rock votes Republican even though it is densely developed (about 33%, above 81% of cities). State and regional patterns outweigh the Democratic lean that density usually predicts here. Green Rock runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Green Rock, IL sits in the top quarter nationally on this measure.
Why turnout in Green Rock looks the way it does
Turnout in Green Rock sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Colona, IL R+23
- Carbon Cliff, IL Even
- Barstow, IL R+22
- Silvis, IL D+9
- Cleveland, IL R+27
- Green River, IL R+28
- East Moline, IL D+17
- Sunny Hill, IL R+33
- Coal Valley, IL R+18
- Hampton, IL Even
Cities with Similar Populations
- Wallaceton, PA R+60
- Vicksville, VA R+41
- Furniss, NY R+16
- Monches, WI R+41
- Froid, MT R+62
- Mount Zion, WV R+63
- Fence Lake, NM R+29
- East Boxford, MA D+5
- Wildorado, TX R+77
- Archer, IA R+69
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.