62618 leans Republican by roughly 16 points: about 42% of voters vote Democratic and 58% Republican.
About 56% of adults in 62618 typically vote, below the U.S. average of about 62%. Among adults in 62618, ~24% vote Democratic, ~32% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How 62618 compares
Among zip codes within 15 miles, 62618 is the least Republican-leaning.
62618 runs about 27 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 62618 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 62618. The northwest side runs the most Democratic (D+3) and the southeast side runs the most Republican (R+50), a spread of about 53 points.
Why 62618 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 62618, not a ranked or complete list of what matters most.
62618 votes Republican even though it is densely developed (about 62%, well above the Illinois average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. 62618 runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Cancer-screening access and voter turnout
Places with low colon-cancer-screening access tend to turn out at a lower rate; 62618, IL sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 62618 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 62618 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High food insecurity lines up with lower turnout, and about 22% of adults in 62618 report food insecurity, above 84% of zip codes. Low high-school completion lines up with lower turnout, and about 80% of adults in 62618 have completed high school, below 91% 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.