62839 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 76% of adults in 62839 typically vote, above the U.S. average of about 62%. Among adults in 62839, ~17% vote Democratic, ~59% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 62839 compares
Among zip codes within 15 miles, 62839 is the least Republican-leaning.
62839 runs about 68 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62839 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62839. The southwest side is the most Republican-leaning (R+67) and the east side is the least Republican-leaning (R+53), a spread of about 13 points.
Why 62839 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 62839, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 89% of residents in 62839 drive to work alone, about 15 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and 62839 sits in the bottom quarter (about 13%, below 88% of zip codes). 62839 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 62839, IL sits in the bottom quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 62839 looks the way it does
Turnout in 62839 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.