61230 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 97% of adults in 61230 typically vote, above the U.S. average of about 62%. Among adults in 61230, ~31% vote Democratic, ~66% Republican, and ~3% don't vote. The map below shows estimated turnout by block group.
How 61230 compares
Among zip codes within 15 miles, 61230 leans more Republican than 10 of 16 neighbors.
61230 runs about 48 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61230 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 61230. The southwest side is the most Republican-leaning (R+52) and the north side is the least Republican-leaning (R+32), a spread of about 19 points.
Why 61230 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 61230, not a ranked or complete list of what matters most.
61230 votes against the grain of Illinois. Illinois leans Democratic overall, while 61230 runs about 48 points more Republican. Car-dependent areas vote Republican, and about 85% of residents in 61230 drive to work alone, above 86% of zip codes.
Homeownership and voter turnout
Places with homeowner-heavy households tend to turn out at a higher rate; 61230, IL sits in the top quarter nationally on this measure.
Why turnout in 61230 looks the way it does
Homeowners vote more often than renters. About 91% of households in 61230 own their home, about 11 points above the Illinois average of 80%. 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.