Marseilles leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 80% of adults in Marseilles typically vote, above the U.S. average of about 62%. Among adults in Marseilles, ~30% vote Democratic, ~50% Republican, and ~20% don't vote. The map below shows estimated turnout by block group.
How Marseilles compares
Among cities within 25 miles, Marseilles leans more Republican than 16 of 64 neighbors.
Marseilles runs about 37 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Marseilles is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Marseilles. The southwest side is the most Republican-leaning (R+39) and the west side is the least Republican-leaning (R+21), a spread of about 18 points.
Why Marseilles 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 Marseilles, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 85% of residents in Marseilles drive to work alone, about 12 points above the U.S. average of 74%. Marseilles runs against the grain of Illinois, a Republican-leaning pocket in a Democratic-leaning state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Marseilles, 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 Marseilles looks the way it does
Turnout in Marseilles 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
- Seneca, IL R+31
- Ottawa, IL R+11
- Stavanger, IL R+39
- Woodland Addition, IL R+34
- Wedron, IL R+33
- Grand Ridge, IL R+42
- Naplate, IL R+26
- Serena, IL R+34
- Ransom, IL R+42
Cities with Similar Populations
- Nashville, AR R+32
- Lambertville, NJ D+27
- Richland Center, WI R+16
- Mendenhall, MS R+34
- Indiantown, FL Even
- Hayesville, NC R+46
- Benson, AZ R+39
- Spring City, TN R+66
- Williamstown, MA D+64
- Nokesville, VA R+27
All Local Stats
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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.