61877 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 99% of adults in 61877 typically vote, above the U.S. average of about 62%. Among adults in 61877, ~33% vote Democratic, ~66% Republican, and ~1% don't vote. The map below shows estimated turnout by block group.
How 61877 compares
Among zip codes within 15 miles, 61877 leans more Republican than 9 of 21 neighbors.
61877 runs about 46 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61877 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 61877. The south side is the most Republican-leaning (R+51) and the east side is the least Republican-leaning (R+28), a spread of about 24 points.
Why 61877 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 61877, not a ranked or complete list of what matters most.
61877 votes against the grain of Illinois. Illinois leans Democratic overall, while 61877 runs about 46 points more Republican. Car-dependent areas vote Republican, and about 84% of residents in 61877 drive to work alone, above 84% of zip codes.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 61877, IL sits above 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 61877 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 61877 have completed high school, about 7 points above the U.S. average of 90%. 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.