62031 is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 84% of adults in 62031 typically vote, above the U.S. average of about 62%. Among adults in 62031, ~20% vote Democratic, ~64% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 62031 compares
Among zip codes within 15 miles, 62031 leans more Republican than 4 of 14 neighbors.
62031 runs about 63 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62031 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62031. The west side is the most Republican-leaning (R+61) and the south side is the least Republican-leaning (R+35), a spread of about 25 points.
Why 62031 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 62031, not a ranked or complete list of what matters most.
62031 votes against the grain of Illinois. Illinois leans Democratic overall, while 62031 runs about 63 points more Republican. Rural areas with a high white share vote Republican. Non-Hispanic white share in 62031 is about 96%, well above similar-sized zip codes (around 79%).
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 62031, IL sits in the bottom tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 62031 looks the way it does
Homeowners vote more often than renters. About 91% of households in 62031 own their home, about 11 points above the Illinois average of 80%. High high-school completion lines up with higher turnout, and about 96% of adults in 62031 have completed high school, above 82% of zip codes. 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.