Long Valley, SD Political Map | Democrat & Republican Areas in Long Valley

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

Long Valley leans slightly Republican by roughly 12 points: about 44% of voters vote Democratic and 56% Republican.

 

About 68% of adults in Long Valley typically vote, above the U.S. average of about 62%. Among adults in Long Valley, ~30% vote Democratic, ~38% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.

How Long Valley compares

Among cities within 25 miles, Long Valley leans more Republican than 5 of 8 neighbors.

Long Valley runs about 17 points more Democratic than South Dakota as a whole.

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

Areas with many family households vote Republican. About 82% of households in Long Valley are family households, about 15 points above the U.S. average of 67%. Rural areas vote Republican, and Long Valley sits in the bottom quarter on density (about 1%, below 97% of cities).

Population density and Republican lean

Places with low population density tend to lean Republican; Long Valley, SD sits in the bottom tenth nationally on this measure.

Why turnout in Long Valley looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Long Valley 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 46%, about 20 points below the South Dakota average of 66%. 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.