61728 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 91% of adults in 61728 typically vote, above the U.S. average of about 62%. Among adults in 61728, ~28% vote Democratic, ~63% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How 61728 compares
Among zip codes within 15 miles, 61728 leans more Republican than 2 of 13 neighbors.
61728 runs about 48 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61728 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 61728. The west side is the most Republican-leaning (R+52) and the east side is the least Republican-leaning (R+33), a spread of about 19 points.
Why 61728 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 61728, not a ranked or complete list of what matters most.
61728 votes against the grain of Illinois. Illinois leans Democratic overall, while 61728 runs about 48 points more Republican.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as 61728, IL does.
Why turnout in 61728 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 61728 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.