57329 leans heavily Republican by roughly 46 points: about 27% of voters vote Democratic and 73% Republican.
About 60% of adults in 57329 typically vote, near the U.S. average of about 62%. Among adults in 57329, ~16% vote Democratic, ~44% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 57329 compares
Among zip codes within 15 miles, 57329 leans more Republican than 2 of 3 neighbors.
57329 runs about 17 points more Republican than South Dakota as a whole.
Why 57329 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 57329, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 76% of households in 57329 are family households, about 9 points above the U.S. average of 67%. Rural areas vote Republican, and 57329 sits in the bottom quarter on density (about 4%, below 87% of zip codes).
Paved land cover and Republican lean
Places with little paved surface tend to lean Republican; 57329, 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 57329 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 57329 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. 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.