Henry, SD Political Map | Democrat & Republican Areas in Henry

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

Henry is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.

 

About 89% of adults in Henry typically vote, above the U.S. average of about 62%. Among adults in Henry, ~19% vote Democratic, ~70% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.

How Henry compares

Among cities within 25 miles, Henry leans more Republican than 12 of 24 neighbors.

Henry runs about 29 points more Republican than South Dakota as a whole.

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

Areas with a high white share and below-average college attainment vote Republican. In Henry, about 98% of residents are non-Hispanic white, about 25 points above the U.S. average of 72%; about 14% of adults hold a bachelor's degree, about 12 points below the South Dakota average of 26%. Rural areas vote Republican, and Henry sits in the bottom quarter on density (about 5%, below 80% of cities).

Population density and Republican lean

Places with low population density tend to lean Republican; Henry, SD sits in the bottom tenth nationally on this measure.

Why turnout in Henry looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Henry is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 71%, about 11 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Henry own their home, about 17 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 98% of adults in Henry have completed high school, above 97% 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.