Vermillion leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 59% of adults in Vermillion typically vote, near the U.S. average of about 62%. Among adults in Vermillion, ~32% vote Democratic, ~26% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How Vermillion compares
Among cities within 25 miles, Vermillion is the most Democratic-leaning.
Vermillion runs about 40 points more Democratic than South Dakota as a whole. South Dakota leans Republican overall, while Vermillion is one of the few Democratic-leaning pockets.
Politics vary noticeably by neighborhood within Vermillion. The south side runs the most Democratic (D+29) and the northeast side runs the most Republican (R+45), a spread of about 74 points.
Why Vermillion 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 Vermillion, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 51% of adults in Vermillion hold a bachelor's degree, about 22 points above the U.S. average of 28%. Dense areas vote Democratic, and Vermillion sits in the top fifth on density (about 57%, above 89% of cities). A high never-married share predicts Democratic voting, and about 59% of adults in Vermillion have never been married, in the top fraction of cities.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Vermillion, SD 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 Vermillion looks the way it does
Renters vote less often than owners. About 52% of households in Vermillion rent, about 27 points above the U.S. average of 25%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Hub City, SD R+45
- Burbank, SD R+38
- Maskell, NE R+62
- Meckling, SD R+45
- Spink, SD R+48
- Newcastle, NE R+62
- Obert, NE R+69
- Wynot, NE R+70
- Junction City, SD R+52
- Dalesburg, SD R+46
Cities with Similar Populations
- Roy, WA R+32
- Byhalia, MS R+32
- Fort Lupton, CO R+22
- Delta, CO R+42
- Fairless Hills, PA Even
- Hopkins, SC D+45
- Manchester, VA D+29
- Campton Hills, IL R+14
- Upper Grand Lagoon, FL R+40
- Cedar Creek, TX R+19
All Local Stats
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Sources and methodology
Precinct-level voting records used to fit the model come from South Dakota Secretary 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.