Onida is a Republican stronghold. About 21% of voters here vote Democratic and 79% Republican.
About 85% of adults in Onida typically vote, above the U.S. average of about 62%. Among adults in Onida, ~18% vote Democratic, ~67% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How Onida compares
Among cities within 25 miles, Onida leans more Republican than 2 of 13 neighbors.
Onida runs about 28 points more Republican than South Dakota as a whole.
Politics vary noticeably by neighborhood within Onida. The southwest side is the most Republican-leaning (R+68) and the north side is the least Republican-leaning (R+55), a spread of about 13 points.
Why Onida leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Onida. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Onida, SD sits in the top tenth 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 Onida looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Onida 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 72%, about 12 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in Onida have completed high school, above 83% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Agar, SD R+68
- Bretton, SD R+60
- Blunt, SD R+57
- Cattron, SD R+70
- Okobojo, SD R+68
- Owattonna, SD R+71
- Gettysburg, SD R+49
- Spring Lake, SD R+63
- Eakin, SD R+53
Cities with Similar Populations
- Folsom, GA R+76
- Mineral Springs, LA R+85
- Princeton, KS R+55
- Pinebur, MS R+66
- Gainesville, NY R+50
- St. Hilaire, MN R+54
- Pettyville, WV R+50
- Brady, NE R+70
- Maximo, OH R+51
- Hanover, KS R+68
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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.