62239 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 75% of adults in 62239 typically vote, above the U.S. average of about 62%. Among adults in 62239, ~25% vote Democratic, ~51% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 62239 compares
Among zip codes within 15 miles, 62239 leans more Republican than 55 of 60 neighbors.
62239 runs about 45 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62239 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62239. The east side is the most Republican-leaning (R+50) and the north side is the least Republican-leaning (R+24), a spread of about 26 points.
Why 62239 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 62239, not a ranked or complete list of what matters most.
62239 votes against the grain of Illinois. Illinois leans Democratic overall, while 62239 runs about 45 points more Republican. Dense places usually vote Democratic, but 62239 runs against that pattern.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 62239, IL sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 62239 looks the way it does
Turnout in 62239 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.