Green Grass, SD Political Map | Democrat & Republican Areas in Green Grass

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

Green Grass leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.

 

About 54% of adults in Green Grass typically vote, below the U.S. average of about 62%. Among adults in Green Grass, ~31% vote Democratic, ~23% Republican, and ~46% don't vote. The map below shows estimated turnout by block group.

How Green Grass compares

Among cities within 25 miles, Green Grass leans more Democratic than 5 of 9 neighbors.

Green Grass runs about 43 points more Democratic than South Dakota as a whole. South Dakota leans Republican overall, while Green Grass is one of the few Democratic-leaning pockets.

Politics vary noticeably by neighborhood within Green Grass. The south side runs the most Democratic (D+49) and the north side runs the most Republican (R+51), a spread of about 101 points.

Why Green Grass 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 Green Grass, not a ranked or complete list of what matters most.

Green Grass votes against the grain of South Dakota. South Dakota leans Republican overall, while Green Grass runs about 43 points more Democratic. A high never-married share predicts Democratic voting, and about 43% of adults in Green Grass have never been married, above 95% of cities.

Cancer-screening access and voter turnout

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

Why turnout in Green Grass looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Green Grass is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 35% of households in Green Grass rent, above 91% of cities. 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.