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

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

Allen leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.

 

About 59% of adults in Allen typically vote, near the U.S. average of about 62%. Among adults in Allen, ~27% vote Democratic, ~32% Republican, and ~41% don't vote. The map below shows estimated turnout by block group.

How Allen compares

Among cities within 25 miles, Allen leans more Republican than 7 of 10 neighbors.

Allen runs about 18 points more Democratic than South Dakota as a whole.

Politics vary noticeably by neighborhood within Allen. The east side runs the most Democratic (Even) and the west side runs the most Republican (R+17), a spread of about 18 points.

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

Areas with low college attainment vote Republican. About 10% of adults in Allen hold a bachelor's degree, about 16 points below the South Dakota average of 26%. A high family-household share predicts Republican voting, and about 83% of households in Allen are family households, above 94% of cities.

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 Allen, SD does.

Why turnout in Allen looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Allen 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 42%, about 24 points below the South Dakota average of 66%. Renters vote less often than owners, and about 46% of households in Allen rent, about 21 points above the U.S. average of 25%. High-crime urban areas turn out at lower rates, and Allen sits in the top 15% on a violent-crime measure. 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.