61811 is a Republican stronghold. About 20% of voters here vote Democratic and 80% Republican.
About 74% of adults in 61811 typically vote, above the U.S. average of about 62%. Among adults in 61811, ~15% vote Democratic, ~59% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 61811 compares
Among zip codes within 15 miles, 61811 leans more Republican than 11 of 15 neighbors.
61811 runs about 71 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61811 is one of the few Republican-leaning pockets.
Why 61811 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 61811, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 61811, about 96% of residents are non-Hispanic white, about 24 points above the U.S. average of 72%; about 13% of adults hold a bachelor's degree, about 14 points below the Illinois average of 27%. 61811 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Republican lean
Places with low population density tend to lean Republican; 61811, IL sits below the national average on this measure.
Why turnout in 61811 looks the way it does
Turnout in 61811 sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.