62643 is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 76% of adults in 62643 typically vote, above the U.S. average of about 62%. Among adults in 62643, ~16% vote Democratic, ~60% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How 62643 compares
Among zip codes within 15 miles, 62643 is the most Republican-leaning.
62643 runs about 69 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62643 is one of the few Republican-leaning pockets.
Why 62643 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 62643, not a ranked or complete list of what matters most.
62643 votes against the grain of Illinois. Illinois leans Democratic overall, while 62643 runs about 69 points more Republican. Car-dependent areas vote Republican, and about 83% of residents in 62643 drive to work alone, above 82% of zip codes.
Population density and Republican lean
Places with low population density tend to lean Republican; 62643, IL sits in the bottom quarter nationally on this measure.
Why turnout in 62643 looks the way it does
High high-school completion lines up with higher turnout, and about 97% of adults in 62643 have completed high school, above 87% of zip codes. 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.