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

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

Isabel leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.

 

About 43% of adults in Isabel typically vote, below the U.S. average of about 62%. Among adults in Isabel, ~13% vote Democratic, ~30% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.

How Isabel compares

Among cities within 25 miles, Isabel leans more Republican than 5 of 6 neighbors.

Isabel runs about 8 points more Republican than South Dakota as a whole.

Politics vary noticeably by neighborhood within Isabel. The northeast side runs the most Democratic (D+58) and the northwest side runs the most Republican (R+69), a spread of about 127 points.

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

Rural areas vote Republican. About 1% of residents in Isabel live in densely developed areas, about 8 points below the South Dakota average of 9%.

Population density, never-married share, and Republican lean

Places that combine low population density and a never-married-heavy adult population tend to lean Republican, as Isabel, SD does.

Why turnout in Isabel looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Isabel 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 32% of households in Isabel rent, above 87% 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.