62702 leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 67% of adults in 62702 typically vote, near the U.S. average of about 62%. Among adults in 62702, ~36% vote Democratic, ~31% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 62702 compares
Among zip codes within 15 miles, 62702 leans more Democratic than 17 of 20 neighbors.
Politically, 62702 sits close to the rest of Illinois.
Politics vary noticeably by block within 62702. The south side runs the most Democratic (D+44) and the northeast side runs the most Republican (R+7), a spread of about 51 points.
Why 62702 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 62702, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 89% of residents in 62702 live in densely developed areas, about 53 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 43% of adults in 62702 have never been married, above 90% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 62702, IL sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 62702 looks the way it does
Turnout in 62702 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.