Sumner leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 73% of adults in Sumner typically vote, above the U.S. average of about 62%. Among adults in Sumner, ~19% vote Democratic, ~54% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.
How Sumner compares
Among cities within 25 miles, Sumner leans more Republican than 39 of 57 neighbors.
Sumner runs about 47 points more Republican than Michigan as a whole.
Why Sumner 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 Sumner, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 13% of adults in Sumner hold a bachelor's degree, about 13 points below the Michigan average of 26%.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Sumner, MI sits below the national average on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Sumner looks the way it does
Turnout in Sumner 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
- Elm Hall, MI R+49
- New Haven Center, MI R+50
- Crystal, MI R+46
- Riverdale, MI R+49
- Middleton, MI R+48
- Elwell, MI R+49
- Alma, MI R+14
- Strickland, MI R+49
- Vestaburg, MI R+51
- Carson City, MI R+45
Cities with Similar Populations
- Corinth, KY R+67
- Bethesda, OH R+54
- Moroni, UT R+66
- Sublette, KS R+63
- St. Clair Springs, AL R+45
- Columbus AFB, MS R+29
- Newburg, MD R+23
- Mount Savage, MD R+56
- Holstein, IA R+57
- Avoca, IA R+41
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from Michigan Department of State, 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.