57660 is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 65% of adults in 57660 typically vote, near the U.S. average of about 62%. Among adults in 57660, ~11% vote Democratic, ~54% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How 57660 compares
Among zip codes within 15 miles, 57660 leans more Republican than 2 of 3 neighbors.
57660 runs about 35 points more Republican than South Dakota as a whole.
Politics vary noticeably by block within 57660. The west side is the most Republican-leaning (R+69) and the northwest side is the least Republican-leaning (R+4), a spread of about 65 points.
Why 57660 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 57660. The lean here lands roughly where demographic data alone would predict.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 57660, SD sits in the bottom tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 57660 looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in 57660 have completed high school, about 6 points above the U.S. average of 90%. Limited routine healthcare access lines up with lower turnout, and 57660 sits in the bottom quarter on routine-care measures. 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.