Ziebach County, SD Political Map | Democrat & Republican Areas in Ziebach County

By the BestNeighborhood data science team. Last updated May 2026.

Ziebach County leans slightly Democratic by roughly 12 points: about 56% of voters vote Democratic and 44% Republican.

 

About 45% of adults in Ziebach County typically vote, below the U.S. average of about 62%. Among adults in Ziebach County, ~25% vote Democratic, ~20% Republican, and ~55% don't vote. The map below shows estimated turnout by block group.

How Ziebach County compares

Ziebach County runs about 41 points more Democratic than South Dakota as a whole. South Dakota leans Republican overall, while Ziebach County is one of the few Democratic-leaning pockets.

Politics vary noticeably by city within Ziebach County. The east side runs the most Democratic (D+37) and the northwest side runs the most Republican (R+33), a spread of about 70 points.

Why Ziebach County leans the way it does

This analysis examined 14,881 data points per county to find what predicts political lean and turnout. The items below are a few correlations that stood out for Ziebach County, not a ranked or complete list of what matters most.

Areas with many never-married adults vote Democratic. About 49% of adults in Ziebach County have never been married, well above similar-sized counties (around 24%). Ziebach County runs against the grain of South Dakota, a Democratic-leaning pocket in a Republican-leaning state.

Cancer-screening access and voter turnout

Places with low colon-cancer-screening access tend to turn out at a lower rate; Ziebach County, SD sits in the bottom tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.

Why turnout in Ziebach County looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Ziebach County is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 46%, about 20 points below the South Dakota average of 66%. Renters vote less often than owners, and about 43% of households in Ziebach County rent, compared to around 26% in nearby counties. High-crime urban areas turn out at lower rates, and Ziebach County sits in the top 15% on a violent-crime measure. Learn more about the findings and methodology on the political spectrum map.

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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.