Mendon is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.
About 75% of adults in Mendon typically vote, above the U.S. average of about 62%. Among adults in Mendon, ~14% vote Democratic, ~61% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Mendon compares
Among cities within 25 miles, Mendon leans more Republican than 26 of 49 neighbors.
Mendon runs about 75 points more Republican than Illinois as a whole. Illinois leans Democratic overall, while Mendon is one of the few Republican-leaning pockets.
Why Mendon 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 Mendon, not a ranked or complete list of what matters most.
Mendon votes against the grain of Illinois. Illinois leans Democratic overall, while Mendon runs about 75 points more Republican. Car-dependent areas vote Republican, and about 86% of residents in Mendon drive to work alone, above 83% of cities. A high white share with below-average college attainment predicts Republican voting, and Mendon fits that profile on both counts.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as Mendon, IL does.
Why turnout in Mendon looks the way it does
Turnout in Mendon 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
- Ursa, IL R+70
- Paloma, IL R+68
- Loraine, IL R+69
- Coatsburg, IL R+69
- Lima, IL R+69
- Fowler, IL R+64
- Tioga, IL R+63
- Columbus, IL R+72
- West Point, IL R+63
- Quincy, IL R+31
Cities with Similar Populations
- Liberty, TN R+67
- Foster, KY R+61
- Leupp, AZ D+58
- Northwood, ND R+37
- Collins, OH R+52
- Moss Bluff, TX R+72
- Bagdad, KY R+51
- Washington, KS R+51
- Starksboro, VT D+9
- Birchwood Lakes, PA R+30
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.