57238 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 67% of adults in 57238 typically vote, near the U.S. average of about 62%. Among adults in 57238, ~15% vote Democratic, ~52% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 57238 compares
Among zip codes within 15 miles, 57238 leans more Republican than 3 of 5 neighbors.
57238 runs about 27 points more Republican than South Dakota as a whole.
Why 57238 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 57238, not a ranked or complete list of what matters most.
Rural areas with a high white share vote Republican. 57238 sits in the bottom quarter on density and about 94% of residents are non-Hispanic white, about 14 points above the South Dakota average of 81%.
Population density and Republican lean
Places with low population density tend to lean Republican; 57238, SD sits in the bottom quarter nationally on this measure.
Why turnout in 57238 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 57238 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 72%, about 12 points above the U.S. average of 60%. 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.