Charles Mix County leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 62% of adults in Charles Mix County typically vote, near the U.S. average of about 62%. Among adults in Charles Mix County, ~19% vote Democratic, ~43% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How Charles Mix County compares
Among counties within 50 miles, Charles Mix County is the least Republican-leaning.
Charles Mix County runs about 10 points more Republican than South Dakota as a whole.
Politics vary noticeably by city within Charles Mix County. The west side is the most Republican-leaning (R+73) and the south side is the least Republican-leaning (R+7), a spread of about 66 points.
Why Charles Mix County leans the way it does
This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Charles Mix County, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 9% of residents in Charles Mix County live in densely developed areas, about 27 points below the U.S. average of 36%.
Population density and Republican lean
Places with low population density tend to lean Republican; Charles Mix County, SD sits in the bottom quarter nationally on this measure.
Why turnout in Charles Mix County looks the way it does
Turnout in Charles Mix County 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 Counties
- Douglas County, SD R+68
- Boyd County, NE R+75
- Aurora County, SD R+59
- Bon Homme County, SD R+58
- Gregory County, SD R+65
- Hutchinson County, SD R+65
- Davison County, SD R+43
- Hanson County, SD R+72
- Holt County, NE R+69
- Brule County, SD R+52
Counties with Similar Populations
- Beaverhead County, MT R+42
- Emmet County, IA R+37
- Clear Creek County, CO D+21
- Deer Lodge County, MT R+18
- Pipestone County, MN R+48
- Nowata County, OK R+61
- Todd County, SD D+57
- Rice County, KS R+54
- Hamilton County, NE R+61
- Latimer County, OK R+66
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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.