57476 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 63% of adults in 57476 typically vote, near the U.S. average of about 62%. Among adults in 57476, ~14% vote Democratic, ~49% Republican, and ~37% don't vote. The map below shows estimated turnout by block group.
How 57476 compares
57476 sits in a sparsely populated area with few comparable zip codes nearby.
57476 runs about 27 points more Republican than South Dakota as a whole.
Politics vary noticeably by block within 57476. The northwest side is the most Republican-leaning (R+66) and the east side is the least Republican-leaning (R+55), a spread of about 11 points.
Why 57476 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 57476, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 4% of residents in 57476 live in densely developed areas, about 5 points below the South Dakota average of 9%. A high family-household share predicts Republican voting, and about 75% of households in 57476 are family households, above 79% of zip codes.
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 57476, SD sits in the bottom quarter 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 57476 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 57476 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 70%, about 10 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.