62990 leans heavily Republican by roughly 32 points: about 34% of voters vote Democratic and 66% Republican.
About 77% of adults in 62990 typically vote, above the U.S. average of about 62%. Among adults in 62990, ~26% vote Democratic, ~51% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How 62990 compares
Among zip codes within 15 miles, 62990 leans more Republican than 7 of 17 neighbors.
62990 runs about 42 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62990 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62990. The northeast side is the most Republican-leaning (R+55) and the southeast side is the least Republican-leaning (R+14), a spread of about 41 points.
Why 62990 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 62990, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 91% of residents in 62990 drive to work alone, about 17 points above the U.S. average of 74%. Low college attainment predicts Republican voting, and 62990 sits in the bottom quarter (about 12%, below 91% of zip codes). 62990 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 62990, IL sits in the bottom quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 62990 looks the way it does
Turnout in 62990 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.