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      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/2026/US Senate/South Dakota
      2026 ForecastSafe R
      2026·US Senate·South Dakota

      South Dakota US Senate

      Incumbent
      RMike Rounds
      Senate Class 2

      Race Analysis

      Analysis coming soon.

      Updated 2026-02-18

      State Demographics

      South Dakota vs. National · Pop. 907K

      White (non-Hispanic)79.8%
      National: 57.4%
      Black2.3%
      National: 12.2%
      Hispanic/Latino4.8%
      National: 19.3%
      Asian1.4%
      National: 6.0%
      College Degree31.9%
      National: 35.6%
      Median Income$75,136
      National: $83,960
      Median Age38.2
      National: 39.1

      Seat History

      US Senate in South Dakota(Class I)

      2022
      John ThuneREP
      R+43.5
      2020
      Mike RoundsREP
      R+31.5
      2016
      John ThuneREP
      R+43.7
      2014
      Mike RoundsREP
      R+20.9
      2010
      John ThuneREP
      R+100.0
      2008
      Tim JohnsonDEM
      D+25.0
      2004
      John ThuneREP
      R+1.1
      2002
      Tim JohnsonDEM
      D+0.2
      1998
      Tom DaschleDEM
      D+25.7
      1996
      Tim JohnsonDEM
      D+2.6
      1992
      Tom DaschleDEM
      D+32.4
      1990
      Larry PresslerREP
      R+7.3
      1986
      Tom DaschleDEM
      D+3.2
      1984
      Larry PresslerREP
      R+49.0
      1980
      James AbdnorREP
      R+18.8
      View all US Senate history for South Dakota →

      Also in South Dakota, 2026

      Governor
      Safe R      ← 2026 Forecast Overview
      ← 2026 Forecast OverviewSouth Dakota profileAll elections