57748 leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 49% of adults in 57748 typically vote, below the U.S. average of about 62%. Among adults in 57748, ~20% vote Democratic, ~29% Republican, and ~51% don't vote. The map below shows estimated turnout by block group.
How 57748 compares
57748 runs about 12 points more Democratic than South Dakota as a whole.
Politics vary noticeably by block within 57748. The southeast side runs the most Democratic (D+37) and the west side runs the most Republican (R+85), a spread of about 122 points.
Why 57748 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 57748, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 76% of households in 57748 are family households, about 10 points above the U.S. average of 67%. Rural areas vote Republican, and 57748 sits in the bottom quarter on density (about 1%, below 98% of zip codes).
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 57748, SD does.
Why turnout in 57748 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 57748 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 39% of households in 57748 rent, above 86% 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.