61338 leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 76% of adults in 61338 typically vote, above the U.S. average of about 62%. Among adults in 61338, ~20% vote Democratic, ~56% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 61338 compares
Among zip codes within 15 miles, 61338 is the most Republican-leaning.
61338 runs about 59 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61338 is one of the few Republican-leaning pockets.
Why 61338 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 61338, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 61338, about 99% of residents are non-Hispanic white, about 26 points above the U.S. average of 72%; about 19% of adults hold a bachelor's degree, about 7 points below the Illinois average of 27%. Rural areas vote Republican, and 61338 sits in the bottom quarter on density (about 6%, below 75% of zip codes). 61338 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 61338, IL sits in the bottom quarter 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 61338 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 61338 have completed high school, about 7 points above the U.S. average of 90%. 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.