61490 leans heavily Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 92% of adults in 61490 typically vote, above the U.S. average of about 62%. Among adults in 61490, ~32% vote Democratic, ~60% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How 61490 compares
Among zip codes within 15 miles, 61490 leans more Republican than 4 of 19 neighbors.
61490 runs about 41 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while 61490 is one of the few Republican-leaning pockets.
Why 61490 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 61490, not a ranked or complete list of what matters most.
61490 votes against the grain of Illinois. Illinois leans Democratic overall, while 61490 runs about 41 points more Republican.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 61490, 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 61490 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 61490 have completed high school, about 5 points above the Illinois average of 92%. 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.