Johnson Siding, SD Political Map | Democrat & Republican Areas in Johnson Siding

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

Johnson Siding leans heavily Republican by roughly 40 points: about 30% of voters vote Democratic and 70% Republican.

 

About 82% of adults in Johnson Siding typically vote, above the U.S. average of about 62%. Among adults in Johnson Siding, ~25% vote Democratic, ~57% Republican, and ~18% don't vote. The map below shows estimated turnout by block group.

How Johnson Siding compares

Among cities within 25 miles, Johnson Siding leans more Republican than 4 of 28 neighbors.

Johnson Siding runs about 11 points more Republican than South Dakota as a whole.

Why Johnson Siding leans the way it does

Density, race composition, education, and family structure all sit close to their national averages in Johnson Siding. The lean here lands roughly where demographic data alone would predict.

Cancer-screening access and voter turnout

Places with high colon-cancer-screening access tend to turn out at a higher rate; Johnson Siding, SD sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.

Why turnout in Johnson Siding looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Johnson Siding 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 72%, about 12 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 92% of households in Johnson Siding 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 Johnson Siding have completed high school, above 94% 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.