57356 leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.
About 48% of adults in 57356 typically vote, below the U.S. average of about 62%. Among adults in 57356, ~14% vote Democratic, ~34% Republican, and ~52% don't vote. The map below shows estimated turnout by block group.
How 57356 compares
Among zip codes within 15 miles, 57356 leans more Republican than 3 of 5 neighbors.
57356 runs about 10 points more Republican than South Dakota as a whole.
Politics vary noticeably by block within 57356. The northwest side is the most Republican-leaning (R+45) and the southeast side is the least Republican-leaning (R+18), a spread of about 28 points.
Why 57356 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 57356, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in 57356 live in densely developed areas, about 32 points below the U.S. average of 36%.
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 57356, SD does.
Why turnout in 57356 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 57356 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High-crime urban areas turn out at lower rates, and 57356 sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.