60421 leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 84% of adults in 60421 typically vote, above the U.S. average of about 62%. Among adults in 60421, ~29% vote Democratic, ~55% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 60421 compares
Among zip codes within 15 miles, 60421 leans more Republican than 18 of 20 neighbors.
60421 runs about 43 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 60421 is one of the few Republican-leaning pockets.
Why 60421 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 60421, not a ranked or complete list of what matters most.
60421 votes against the grain of Illinois. Illinois leans Democratic overall, while 60421 runs about 43 points more Republican. Car-dependent areas vote Republican, and about 83% of residents in 60421 drive to work alone, above 81% of zip codes.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 60421, IL sits above the national average on this measure.
Why turnout in 60421 looks the way it does
Turnout in 60421 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.