Marengo leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 89% of adults in Marengo typically vote, above the U.S. average of about 62%. Among adults in Marengo, ~34% vote Democratic, ~55% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Marengo compares
Among cities within 25 miles, Marengo leans more Republican than 70 of 97 neighbors.
Marengo runs about 34 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Marengo is one of the few Republican-leaning pockets.
Why Marengo 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 Marengo, not a ranked or complete list of what matters most.
Marengo votes against the grain of Illinois. Illinois leans Democratic overall, while Marengo runs about 34 points more Republican. Dense places usually vote Democratic, but Marengo runs against that pattern.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Marengo, IL sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Marengo looks the way it does
Turnout in Marengo 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
- Union, IL R+22
- Franklinville, IL R+17
- Garden Prairie, IL R+34
- New Lebanon, IL R+31
- Hartland, IL R+28
- Woodstock, IL D+3
- Huntley, IL R+3
- Hampshire, IL R+19
- Genoa, IL R+24
- Ridgefield, IL R+6
Cities with Similar Populations
- Augusta, KS R+42
- Glendale, WI D+47
- Green River, WY R+50
- Ellisville, MS R+51
- Manchester, MD R+36
- East Rockaway, NY R+17
- Chipley, FL R+60
- Isanti, MN R+31
- Flanders, NJ R+6
- Platte City, MO R+19
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.