Harrison is a Republican stronghold. About 14% of voters here vote Democratic and 86% Republican.
About 64% of adults in Harrison typically vote, near the U.S. average of about 62%. Among adults in Harrison, ~9% vote Democratic, ~55% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How Harrison compares
Among cities within 25 miles, Harrison leans more Republican than 12 of 14 neighbors.
Harrison runs about 42 points more Republican than South Dakota as a whole.
Why Harrison 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 Harrison, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 5% of residents in Harrison live in densely developed areas, about 31 points below the U.S. average of 36%.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Harrison, SD sits in the top quarter nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Harrison looks the way it does
Turnout in Harrison 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.
Nearby Cities
- New Holland, SD R+70
- Corsica, SD R+72
- Stickney, SD R+60
- Armour, SD R+59
- Geddes, SD R+66
- Hillside, SD R+71
- Platte, SD R+66
- Lake Andes, SD R+44
- Ravinia, SD R+40
- Plankinton, SD R+58
Cities with Similar Populations
- McLarty, AL R+86
- Eagarville, IL R+52
- Eagle Harbor, MD D+21
- Palo Verde, CA R+8
- Upalco, UT R+90
- Eliza, LA R+90
- Martinsville, MO R+69
- Browns, AL D+36
- McVille, PA R+56
- Enon, MO R+68
All Local Stats
Home Services
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.