Gregory County is a Republican stronghold. About 18% of voters here vote Democratic and 82% Republican.
About 66% of adults in Gregory County typically vote, near the U.S. average of about 62%. Among adults in Gregory County, ~12% vote Democratic, ~54% Republican, and ~34% don't vote. The map below shows estimated turnout by block group.
How Gregory County compares
Among counties within 50 miles, Gregory County leans more Republican than 3 of 7 neighbors.
Gregory County runs about 36 points more Republican than South Dakota as a whole.
Why Gregory County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Gregory County. The lean here lands roughly where demographic data alone would predict.
Population density and Republican lean
Places with low population density tend to lean Republican; Gregory County, SD sits in the bottom tenth nationally on this measure.
Why turnout in Gregory County looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Gregory County is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 66%, about 6 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Tripp County, SD R+58
- Keya Paha County, NE R+82
- Boyd County, NE R+75
- Charles Mix County, SD R+39
- Brule County, SD R+52
- Rock County, NE R+74
- Douglas County, SD R+68
- Aurora County, SD R+59
- Brown County, NE R+74
- Holt County, NE R+69
Counties with Similar Populations
- Pierce County, ND R+47
- Edmunds County, SD R+60
- Kearny County, KS R+71
- Wells County, ND R+58
- Schuyler County, MO R+67
- Mason County, TX R+56
- Columbia County, WA R+51
- Owsley County, KY R+74
- Red Lake County, MN R+47
- Meade County, KS 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.