St. Onge is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 68% of adults in St. Onge typically vote, above the U.S. average of about 62%. Among adults in St. Onge, ~14% vote Democratic, ~54% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How St. Onge compares
Among cities within 25 miles, St. Onge leans more Republican than 14 of 20 neighbors.
St. Onge runs about 28 points more Republican than South Dakota as a whole.
Politics vary noticeably by neighborhood within St. Onge. The northwest side is the most Republican-leaning (R+65) and the east side is the least Republican-leaning (R+53), a spread of about 12 points.
Why St. Onge 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 St. Onge, not a ranked or complete list of what matters most.
Areas with many family households vote Republican. About 78% of households in St. Onge are family households, about 12 points above the U.S. average of 67%.
Population density and Republican lean
Places with low population density tend to lean Republican; St. Onge, SD sits below the national average on this measure.
Why turnout in St. Onge looks the way it does
Areas with strong routine healthcare access turn out at higher rates. St. Onge 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 73%, about 13 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 91% of households in St. Onge own their home, about 16 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 97% of adults in St. Onge have completed high school, above 89% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Spearfish, SD R+32
- Fruitdale, SD R+72
- Belle Fourche, SD R+56
- Whitewood, SD R+53
- Nisland, SD R+78
- Central City, SD R+51
- Deadwood, SD R+49
- Lead, SD R+33
- Trojan, SD R+51
Cities with Similar Populations
- Innsbrook, MO R+42
- Logansville, OH R+72
- Como, CO R+12
- Soldier Creek, SD D+64
- Dunbar, WI R+38
- Altura, MN R+38
- Richwood, NJ R+8
- Roxbury, WI Even
- Pennington, AL D+28
- Orient, TX R+74
All Local Stats
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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.