Shelby leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.
About 54% of adults in Shelby typically vote, below the U.S. average of about 62%. Among adults in Shelby, ~20% vote Democratic, ~33% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.
How Shelby compares
Among cities within 25 miles, Shelby leans more Republican than 5 of 14 neighbors.
Shelby runs about 5 points more Democratic than South Dakota as a whole.
Politics vary noticeably by neighborhood within Shelby. The north side runs the most Democratic (Even) and the southwest side runs the most Republican (R+65), a spread of about 67 points.
Why Shelby 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 Shelby, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 10% of adults in Shelby hold a bachelor's degree, about 16 points below the South Dakota average of 26%. Rural areas vote Republican, and Shelby sits in the bottom quarter on density (about 3%, below 94% of cities).
Population density, never-married share, and Republican lean
Places that combine low population density and a never-married-heavy adult population tend to lean Republican, as Shelby, SD does.
Why turnout in Shelby looks the way it does
Areas with limited routine healthcare access turn out at lower rates. Shelby is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 31% of households in Shelby rent, above 85% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Pukwana, SD R+60
- Gann Valley, SD D+11
- Chamberlain, SD R+43
- Lyonville, SD R+59
- Oacoma, SD R+61
- Fort Thompson, SD D+30
- Spring Valley Colony, SD R+17
- Reliance, SD R+63
- Kimball, SD R+65
- Lower Brule, SD D+72
Cities with Similar Populations
- Neilton, WA R+37
- Synarep, WA R+31
- Sespe, CA R+8
- Lords Valley, PA R+36
- Shulls Mill, NC D+3
- Cedar River, MI R+33
- Vanduser, MO R+52
- Bear Creek Village, PA R+36
- Lowes, KY R+71
- Cecil, AR R+71
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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.