61830 leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 82% of adults in 61830 typically vote, above the U.S. average of about 62%. Among adults in 61830, ~23% vote Democratic, ~59% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.
How 61830 compares
Among zip codes within 15 miles, 61830 leans more Republican than 7 of 15 neighbors.
61830 runs about 54 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61830 is one of the few Republican-leaning pockets.
Why 61830 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 61830, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 6% of residents in 61830 live in densely developed areas, about 27 points below the Illinois average of 33%. A high family-household share predicts Republican voting, and about 76% of households in 61830 are family households, above 82% of zip codes. 61830 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; 61830, IL sits in the bottom quarter nationally on this measure.
Why turnout in 61830 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 61830 have completed high school, about 6 points above the Illinois average of 92%. 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.