Chamberlain leans heavily Republican by roughly 44 points: about 28% of voters vote Democratic and 72% Republican.
About 69% of adults in Chamberlain typically vote, above the U.S. average of about 62%. Among adults in Chamberlain, ~19% vote Democratic, ~49% Republican, and ~32% don't vote. The map below shows estimated turnout by block group.
How Chamberlain compares
Among cities within 25 miles, Chamberlain leans more Republican than 4 of 13 neighbors.
Chamberlain runs about 14 points more Republican than South Dakota as a whole.
Politics vary noticeably by neighborhood within Chamberlain. The southwest side is the most Republican-leaning (R+65) and the northwest side is the least Republican-leaning (R+24), a spread of about 40 points.
Why Chamberlain leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Chamberlain. The lean here lands roughly where demographic data alone would predict.
Population density and Democratic lean
Places with high population density tend to lean Democratic; Chamberlain, SD sits in the top quarter nationally on this measure.
Why turnout in Chamberlain looks the way it does
Turnout in Chamberlain 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
- Oacoma, SD R+61
- Pukwana, SD R+60
- Shelby, SD R+24
- Grandview, SD R+66
- Reliance, SD R+63
- Ola, SD R+65
- Lyonville, SD R+59
- Fort Thompson, SD D+30
- Kimball, SD R+65
- Gann Valley, SD D+11
Cities with Similar Populations
- Bridgeport, IL R+58
- Lawnside, NJ D+83
- Silver Lake, IN R+62
- Inglis, FL R+59
- Clearbrook Park, NJ D+12
- Fairland, OK R+64
- Litchfield, MI R+53
- St. Bonifacius, MN R+11
- Stillwater, NJ R+32
- Woodcreek, TX R+20
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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.