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

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

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

 

About 32% of adults in Rockyford typically vote, below the U.S. average of about 62%. Among adults in Rockyford, ~25% vote Democratic, ~7% Republican, and ~68% don't vote. The map below shows estimated turnout by block group.

How Rockyford compares

Among cities within 25 miles, Rockyford leans more Democratic than 7 of 8 neighbors.

Rockyford runs about 87 points more Democratic than South Dakota as a whole. South Dakota leans Republican overall, while Rockyford is one of the few Democratic-leaning pockets.

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

Rockyford votes against the grain of South Dakota. South Dakota leans Republican overall, while Rockyford runs about 87 points more Democratic. A high never-married share predicts Democratic voting, and about 71% of adults in Rockyford have never been married, in the top fraction of cities.

Preventive-care access and voter turnout

Places with limited routine preventive-care access tend to turn out at a lower rate; Rockyford, SD sits in the bottom tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Rockyford looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Rockyford 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 31%, about 34 points below the South Dakota average of 66%. Renters vote less often than owners, and about 73% of households in Rockyford rent, compared to around 47% in nearby cities. Low high-school completion lines up with lower turnout, and about 53% of adults in Rockyford have completed high school, in the bottom fraction 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.