Dupo leans Republican by roughly 30 points: about 35% of voters vote Democratic and 65% Republican.
About 74% of adults in Dupo typically vote, above the U.S. average of about 62%. Among adults in Dupo, ~26% vote Democratic, ~48% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How Dupo compares
Among cities within 25 miles, Dupo leans more Republican than 133 of 171 neighbors.
Dupo runs about 40 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Dupo is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Dupo. The east side is the most Republican-leaning (R+50) and the northeast side is the least Republican-leaning (R+24), a spread of about 26 points.
Why Dupo leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Dupo, not a ranked or complete list of what matters most.
Dupo 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. Dupo runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Dupo, IL sits in the top quarter 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 Dupo looks the way it does
Turnout in Dupo 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 Cities
- East Carondelet, IL R+43
- Cahokia, IL D+57
- Phelps, IL R+29
- Sauget, IL D+45
- Lemay, MO D+2
- Bella Villa, MO D+6
- Columbia, IL R+30
- Wilbur Park, MO D+11
- St. George, MO D+10
- Alorton, IL D+82
Cities with Similar Populations
- Cozad, NE R+50
- West Newbury, MA D+22
- Anthony, TX D+6
- Lenox, MA D+39
- Otisville, MI R+29
- Spirit Lake, ID R+60
- Dryden, NY D+17
- Hebbronville, TX R+3
- Marmora, NJ R+20
- Minster, OH R+68
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.