Roberts County leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 61% of adults in Roberts County typically vote, near the U.S. average of about 62%. Among adults in Roberts County, ~25% vote Democratic, ~36% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How Roberts County compares
Among counties within 50 miles, Roberts County is the least Republican-leaning.
Roberts County runs about 10 points more Democratic than South Dakota as a whole.
Politics vary noticeably by city within Roberts County. The west side runs the most Democratic (D+7) and the northeast side runs the most Republican (R+54), a spread of about 61 points.
Why Roberts County leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in Roberts County. The lean here lands roughly where demographic data alone would predict.
Park access and Republican lean
Places with low park coverage tend to lean Republican; Roberts County, SD sits in the bottom quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Roberts County looks the way it does
Turnout in Roberts County sits close to the national pattern. Learn more about the findings and methodology on the political spectrum map.
Nearby Counties
- Traverse County, MN R+42
- Big Stone County, MN R+33
- Grant County, SD R+52
- Day County, SD R+42
- Marshall County, SD R+31
- Richland County, ND R+38
- Sargent County, ND R+50
- Codington County, SD R+42
- Stevens County, MN R+37
- Wilkin County, MN R+39
Counties with Similar Populations
- Noxubee County, MS D+49
- Metcalfe County, KY R+65
- Nemaha County, KS R+64
- Johnston County, OK R+65
- Lowndes County, AL D+35
- Butte County, SD R+62
- Montgomery County, IA R+41
- Clay County, TX R+74
- Chicot County, AR D+3
- Ralls County, MO R+62
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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.