57520 is a Republican stronghold. About 16% of voters here vote Democratic and 84% Republican.
About 46% of adults in 57520 typically vote, below the U.S. average of about 62%. Among adults in 57520, ~7% vote Democratic, ~39% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How 57520 compares
57520 sits in a sparsely populated area with few comparable zip codes nearby.
57520 runs about 39 points more Republican than South Dakota as a whole.
Why 57520 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 57520. The lean here lands roughly where demographic data alone would predict.
Park access and Republican lean
Places with low park coverage tend to lean Republican; 57520, SD sits in the bottom tenth nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in 57520 looks the way it does
Renters vote less often than owners. About 35% of households in 57520 rent, about 10 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and 57520 sits in the top 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.