Irene leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 56% of adults in Irene typically vote, below the U.S. average of about 62%. Among adults in Irene, ~15% vote Democratic, ~41% Republican, and ~44% don't vote. The map below shows estimated turnout by block group.
How Irene compares
Among cities within 25 miles, Irene leans more Republican than 9 of 35 neighbors.
Irene runs about 19 points more Republican than South Dakota as a whole.
Politics vary noticeably by neighborhood within Irene. The southwest side is the most Republican-leaning (R+58) and the south side is the least Republican-leaning (R+43), a spread of about 15 points.
Why Irene leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Irene. 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; Irene, SD sits below the national average on this measure.
Why turnout in Irene looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Irene 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 70%, about 10 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Midway, SD R+54
- Wakonda, SD R+44
- Mayfield, SD R+58
- Viborg, SD R+51
- Volin, SD R+56
- Centerville, SD R+50
- Pearsons Corner, SD R+55
- Mission Hill, SD R+54
- Spring Valley, SD R+54
- Gayville, SD R+54
Cities with Similar Populations
- Cumberland Heights, TN R+70
- Pickett, TX R+69
- Ute, IA R+53
- Lancaster, KS R+61
- Shacktown, NC R+64
- June Lake, CA D+16
- Uswick, PA R+42
- Neier, MO R+63
- Tuftonboro, NH R+32
- Gladys, GA R+76
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.