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

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

Promise is a Democratic stronghold. About 75% of voters here vote Democratic and 25% Republican.

 

About 61% of adults in Promise typically vote, near the U.S. average of about 62%. Among adults in Promise, ~46% vote Democratic, ~15% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.

How Promise compares

Among cities within 25 miles, Promise is the most Democratic-leaning.

Promise runs about 79 points more Democratic than South Dakota as a whole. South Dakota leans Republican overall, while Promise is one of the few Democratic-leaning pockets.

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

Promise votes against the grain of South Dakota. South Dakota leans Republican overall, while Promise runs about 79 points more Democratic. A high never-married share predicts Democratic voting, and about 49% of adults in Promise have never been married, above 98% of cities.

Cancer-screening access and voter turnout

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

Why turnout in Promise looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Promise 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 38% of households in Promise rent, above 93% of cities. High-crime urban areas turn out at lower rates, and Promise 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.