57641 leans heavily Republican by roughly 34 points: about 33% of voters vote Democratic and 67% Republican.
About 60% of adults in 57641 typically vote, near the U.S. average of about 62%. Among adults in 57641, ~20% vote Democratic, ~40% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How 57641 compares
Politically, 57641 sits close to the rest of South Dakota.
Politics vary noticeably by block within 57641. The northeast side runs the most Democratic (D+58) and the west side runs the most Republican (R+69), a spread of about 127 points.
Why 57641 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 57641. 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; 57641, SD sits in the bottom tenth 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 57641 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 57641 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. High food insecurity lines up with lower turnout, and about 35% of adults in 57641 report food insecurity, 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.