62639 is a Republican stronghold. About 25% of voters here vote Democratic and 75% Republican.
About 74% of adults in 62639 typically vote, above the U.S. average of about 62%. Among adults in 62639, ~18% vote Democratic, ~56% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 62639 compares
Among zip codes within 15 miles, 62639 leans more Republican than 4 of 9 neighbors.
62639 runs about 62 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62639 is one of the few Republican-leaning pockets.
Why 62639 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 62639, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 90% of residents in 62639 drive to work alone, about 16 points above the U.S. average of 74%. 62639 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; 62639, IL sits in the bottom quarter nationally on this measure.
Why turnout in 62639 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 62639 have completed high school, about 5 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.