57075 leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 74% of adults in 57075 typically vote, above the U.S. average of about 62%. Among adults in 57075, ~20% vote Democratic, ~54% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.
How 57075 compares
Among zip codes within 15 miles, 57075 leans more Republican than 1 of 6 neighbors.
57075 runs about 17 points more Republican than South Dakota as a whole.
Why 57075 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 57075. The lean here lands roughly where demographic data alone would predict.
Walkability and Republican lean
Places with a low walkability score tend to lean Republican; 57075, 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 57075 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 57075 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 77%, about 17 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 88% of households in 57075 own their home, above 82% of zip codes. High high-school completion lines up with higher turnout, and about 99% of adults in 57075 have completed high school, above 97% 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.