62640 leans heavily Republican by roughly 42 points: about 29% of voters vote Democratic and 71% Republican.
About 74% of adults in 62640 typically vote, above the U.S. average of about 62%. Among adults in 62640, ~21% vote Democratic, ~53% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 62640 compares
Among zip codes within 15 miles, 62640 leans more Republican than 3 of 13 neighbors.
62640 runs about 54 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62640 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62640. The south side is the most Republican-leaning (R+53) and the east side is the least Republican-leaning (R+34), a spread of about 19 points.
Why 62640 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 62640, not a ranked or complete list of what matters most.
62640 votes against the grain of Illinois. Illinois leans Democratic overall, while 62640 runs about 54 points more Republican. A high white share with below-average college attainment predicts Republican voting, and 62640 fits that profile on both counts.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 62640, IL sits below the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 62640 looks the way it does
Turnout in 62640 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.