57758 is a Republican stronghold. About 9% of voters here vote Democratic and 91% Republican.
About 60% of adults in 57758 typically vote, near the U.S. average of about 62%. Among adults in 57758, ~5% vote Democratic, ~55% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 57758 compares
57758 runs about 54 points more Republican than South Dakota as a whole.
Why 57758 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 57758, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 2% of residents in 57758 live in densely developed areas, about 8 points below the South Dakota average of 9%.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 57758, SD sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 57758 looks the way it does
Renters vote less often than owners. About 43% of households in 57758 rent, about 18 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 96% of adults in 57758 have completed high school, above 83% of zip codes. 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.