62521 leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 75% of adults in 62521 typically vote, above the U.S. average of about 62%. Among adults in 62521, ~35% vote Democratic, ~40% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 62521 compares
Among zip codes within 15 miles, 62521 leans more Republican than 3 of 19 neighbors.
62521 runs about 17 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62521 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62521. The northwest side runs the most Democratic (D+64) and the southeast side runs the most Republican (R+40), a spread of about 104 points.
Why 62521 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 62521, not a ranked or complete list of what matters most.
62521 votes Republican even though it is densely developed (about 71%, far above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. 62521 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 62521, IL sits in the top quarter nationally on this measure.
Why turnout in 62521 looks the way it does
Turnout in 62521 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.