Gann Valley, SD Political Map | Democrat & Republican Areas in Gann Valley

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

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

 

About 53% of adults in Gann Valley typically vote, below the U.S. average of about 62%. Among adults in Gann Valley, ~30% vote Democratic, ~23% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.

How Gann Valley compares

Among cities within 25 miles, Gann Valley leans more Democratic than 11 of 13 neighbors.

Gann Valley runs about 40 points more Democratic than South Dakota as a whole. South Dakota leans Republican overall, while Gann Valley is one of the few Democratic-leaning pockets.

Politics vary noticeably by neighborhood within Gann Valley. The northwest side is the most Democratic-leaning (D+43) and the southwest side is the least Democratic-leaning (Even), a spread of about 41 points.

Why Gann Valley leans the way it does

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

Areas with many never-married adults vote Democratic. About 60% of adults in Gann Valley have never been married, far above similar-sized cities (around 20%). Gann Valley runs against the grain of South Dakota, a Democratic-leaning pocket in a Republican-leaning state.

Homeownership and voter turnout

Places with renter-heavy households tend to turn out at a lower rate; Gann Valley, SD sits in the bottom tenth nationally on this measure.

Why turnout in Gann Valley looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Gann Valley 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 45% of households in Gann Valley rent, about 20 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and Gann Valley 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.