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

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

Selby is a Republican stronghold. About 14% of voters here vote Democratic and 86% Republican.

 

About 55% of adults in Selby typically vote, below the U.S. average of about 62%. Among adults in Selby, ~8% vote Democratic, ~47% Republican, and ~45% don't vote. The map below shows estimated turnout by block group.

How Selby compares

Among cities within 25 miles, Selby leans more Republican than 6 of 12 neighbors.

Selby runs about 43 points more Republican than South Dakota as a whole.

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

Rural areas vote Republican. About 4% of residents in Selby live in densely developed areas, about 5 points below the South Dakota average of 9%.

Paved land cover and Republican lean

Places with little paved surface tend to lean Republican; Selby, SD sits below the national average on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.

Why turnout in Selby looks the way it does

Turnout in Selby sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.