57065 is a Republican stronghold. About 23% of voters here vote Democratic and 77% Republican.
About 89% of adults in 57065 typically vote, above the U.S. average of about 62%. Among adults in 57065, ~21% vote Democratic, ~69% Republican, and ~10% don't vote. The map below shows estimated turnout by block group.
How 57065 compares
Among zip codes within 15 miles, 57065 leans more Republican than 6 of 9 neighbors.
57065 runs about 24 points more Republican than South Dakota as a whole.
Why 57065 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 57065, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 5% of residents in 57065 live in densely developed areas, about 31 points below the U.S. average of 36%.
Population density and Republican lean
Places with low population density tend to lean Republican; 57065, SD sits in the bottom tenth nationally on this measure.
Why turnout in 57065 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 57065 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 57065 have completed high school, above 92% 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.