62428 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 75% of adults in 62428 typically vote, above the U.S. average of about 62%. Among adults in 62428, ~16% vote Democratic, ~59% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 62428 compares
Among zip codes within 15 miles, 62428 is the least Republican-leaning.
62428 runs about 67 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62428 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62428. The southeast side is the most Republican-leaning (R+62) and the west side is the least Republican-leaning (R+49), a spread of about 13 points.
Why 62428 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 62428, not a ranked or complete list of what matters most.
62428 votes against the grain of Illinois. Illinois leans Democratic overall, while 62428 runs about 67 points more Republican. A high white share with below-average college attainment predicts Republican voting, and 62428 fits that profile on both counts.
Foreign-born share and voter turnout
Places with a low foreign-born share tend to turn out in mixed patterns; 62428, IL sits in the bottom tenth nationally on this measure.
Why turnout in 62428 looks the way it does
Turnout in 62428 sits close to the national pattern. 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.