57257 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 57% of adults in 57257 typically vote, near the U.S. average of about 62%. Among adults in 57257, ~26% vote Democratic, ~31% Republican, and ~43% don't vote. The map below shows estimated turnout by block group.
How 57257 compares
Among zip codes within 15 miles, 57257 leans more Republican than 1 of 4 neighbors.
57257 runs about 19 points more Democratic than South Dakota as a whole.
Politics vary noticeably by block within 57257. The northwest side runs the most Democratic (D+28) and the southwest side runs the most Republican (R+34), a spread of about 62 points.
Why 57257 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 57257, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 11% of adults in 57257 hold a bachelor's degree, about 15 points below the South Dakota average of 26%. Rural areas vote Republican, and 57257 sits in the bottom quarter on density (about 4%, below 87% of zip codes). A high family-household share predicts Republican voting, and about 74% of households in 57257 are family households, above 76% of zip codes.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 57257, SD sits in the bottom quarter nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 57257 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 57257 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 34% of households in 57257 rent, compared to around 18% in nearby 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.