61920 leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.
About 60% of adults in 61920 typically vote, near the U.S. average of about 62%. Among adults in 61920, ~26% vote Democratic, ~34% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 61920 compares
Among zip codes within 15 miles, 61920 is the least Republican-leaning.
61920 runs about 22 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61920 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 61920. The south side runs the most Democratic (D+17) and the northeast side runs the most Republican (R+47), a spread of about 65 points.
Why 61920 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 61920, not a ranked or complete list of what matters most.
61920 votes against the grain of Illinois. Illinois leans Democratic overall, while 61920 runs about 22 points more Republican.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 61920, 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 61920 looks the way it does
Renters vote less often than owners. About 44% of households in 61920 rent, about 19 points above the U.S. average of 25%. 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.