United States Presidential election7 Nov 2028in 729 days Senate D 97% House D 58% Calendar Track record Research
PollingForecast.com United States
Closest results
United States · Election results history · 2020 Senate · South Dakota
Election 2020 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

2020 US Senate election in South Dakota

Mike Rounds (Republican) beat Dan Ahlers (Democrat) in South Dakota in 2020, 65.7% to 34.3%, a margin of 31.5 points and 132,245 votes.

The Republican hold continued from 2014, when Mike Rounds also won.

Republicans led in 61 of the 66 counties and Democrats in 5. The largest, Minnehaha, cast 91,572 votes and went to the Republican by 15.3 points. The closest was Ziebach, where 8 votes separated the two parties.

United States
Results
2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958 1957 1956 1955 1954 1953 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943 1942 1941 1940 1939 1938 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920 1919 1918 1917 1916 1915 1914 1913 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903 1902 1901 1900 1899 1898 1897 1896 1895 1894 1893 1892 1891 1890 1889 1888 1887 1886 1885 1884 1883 1882 1881 1880 1879 1878 1877 1876 1875 1874 1873 1872 1871 1870 1869 1868 1867 1866 1865
If only voted How this works
If the polls miss like

Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Mike Rounds won Republican 276,232 65.7%
Dan Ahlers Democratic 143,987 34.3%
Total420,219

Every county

CountyDemocratRepublicanOthersTotalMargin
Minnehaha 38,799 42.4% 52,773 57.6% 91,572 R+15.3
Pennington 19,184 33.7% 37,694 66.3% 56,878 R+32.5
Lincoln 11,013 34.2% 21,221 65.8% 32,234 R+31.7
Brown 6,283 36.0% 11,168 64.0% 17,451 R+28.0
Brookings 5,746 39.5% 8,792 60.5% 14,538 R+21.0
Lawrence 4,358 31.7% 9,385 68.3% 13,743 R+36.6
Meade 3,176 23.5% 10,355 76.5% 13,531 R+53.1
Codington 3,626 27.7% 9,479 72.3% 13,105 R+44.7
Yankton 3,848 35.5% 6,994 64.5% 10,842 R+29.0
Union 2,407 27.4% 6,364 72.6% 8,771 R+45.1
Hughes 2,546 29.1% 6,217 70.9% 8,763 R+41.9
Davison 2,540 30.1% 5,893 69.9% 8,433 R+39.8
Beadle 1,986 28.0% 5,104 72.0% 7,090 R+44.0
Lake 2,069 35.2% 3,816 64.8% 5,885 R+29.7
Clay 2,807 49.6% 2,857 50.4% 5,664 R+0.9
Custer 1,483 27.2% 3,973 72.8% 5,456 R+45.6
Butte 961 20.1% 3,809 79.9% 4,770 R+59.7
Turner 1,126 24.8% 3,416 75.2% 4,542 R+50.4
Roberts 1,767 41.1% 2,529 58.9% 4,296 R+17.7
Fall River 993 24.8% 3,009 75.2% 4,002 R+50.4
Charles Mix 1,259 33.1% 2,542 66.9% 3,801 R+33.8
Hutchinson 772 20.6% 2,982 79.4% 3,754 R+58.9
Grant 1,026 27.4% 2,723 72.6% 3,749 R+45.3
Moody 1,343 41.7% 1,877 58.3% 3,220 R+16.6
Oglala Lakota 2,691 84.1% 510 15.9% 3,201 D+68.1
Spink 986 31.2% 2,178 68.8% 3,164 R+37.7
Hamlin 657 21.4% 2,413 78.6% 3,070 R+57.2
Bon Homme 834 27.9% 2,156 72.1% 2,990 R+44.2
Day 1,069 36.1% 1,895 63.9% 2,964 R+27.9
McCook 835 28.7% 2,072 71.3% 2,907 R+42.6
Kingsbury 809 29.1% 1,970 70.9% 2,779 R+41.8
Tripp 502 18.7% 2,188 81.3% 2,690 R+62.7
Walworth 525 20.5% 2,040 79.5% 2,565 R+59.1
Todd 1,796 71.8% 706 28.2% 2,502 D+43.6
Brule 756 30.3% 1,735 69.7% 2,491 R+39.3
Hanson 564 23.9% 1,796 76.1% 2,360 R+52.2
Deuel 628 26.8% 1,714 73.2% 2,342 R+46.4
Gregory 488 21.7% 1,766 78.3% 2,254 R+56.7
Marshall 853 39.0% 1,334 61.0% 2,187 R+22.0
Edmunds 448 22.5% 1,539 77.5% 1,987 R+54.9
Dewey 1,062 54.6% 884 45.4% 1,946 D+9.1
Hand 378 20.3% 1,480 79.7% 1,858 R+59.3
Clark 450 24.4% 1,397 75.6% 1,847 R+51.3
Douglas 235 13.8% 1,469 86.2% 1,704 R+72.4
Stanley 378 22.9% 1,274 77.1% 1,652 R+54.2
Perkins 249 15.1% 1,395 84.9% 1,644 R+69.7
Lyman 533 33.3% 1,066 66.7% 1,599 R+33.3
Aurora 403 28.7% 1,002 71.3% 1,405 R+42.6
Potter 224 16.2% 1,160 83.8% 1,384 R+67.6
McPherson 235 17.8% 1,086 82.2% 1,321 R+64.4
Corson 583 46.1% 681 53.9% 1,264 R+7.8
Faulk 213 17.9% 975 82.1% 1,188 R+64.1
Sanborn 281 23.8% 898 76.2% 1,179 R+52.3
Bennett 437 37.5% 729 62.5% 1,166 R+25.0
Miner 339 29.6% 807 70.4% 1,146 R+40.8
Haakon 106 9.3% 1,032 90.7% 1,138 R+81.4
Jackson 357 32.1% 756 67.9% 1,113 R+35.8
Jerauld 277 27.8% 720 72.2% 997 R+44.4
Sully 168 18.1% 759 81.9% 927 R+63.8
Ziebach 458 50.4% 450 49.6% 908 D+0.9
Campbell 122 14.1% 745 85.9% 867 R+71.9
Harding 73 9.1% 727 90.9% 800 R+81.8
Mellette 303 39.3% 468 60.7% 771 R+21.4
Hyde 143 20.1% 568 79.9% 711 R+59.8
Jones 99 16.6% 497 83.4% 596 R+66.8
Buffalo 322 59.1% 223 40.9% 545 D+18.2

Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

South Dakota Senate elections we hold

YearWinnerMargin
2022 John R Thune (R) R+43.5
2020 Mike Rounds (R) R+31.5
2016 John R. Thune (R) R+43.7
2014 Mike Rounds (R) R+20.9
2010 John Thune (R) R+100.0
2008 Tim Johnson (D) D+25.0
2004 John Thune (R) R+1.2
2002 Tim Johnson (D) D+0.2
1998 Tom Daschle (D) D+25.7
1996 Tim Johnson (D) D+2.6
1992 Thomas A. Daschle (D) D+32.4
1990 Larry Pressler (R) R+7.3
1986 Thomas A. Daschle (D) D+3.2
1984 Larry Pressler (R) R+49.0
1980 James Abdnor (R) R+18.8
1978 Larry Pressler (R) R+33.7
1974 George McGovern (D) D+6.1
1972 James Abourezk (D) D+14.1
1968 George McGovern (D) D+13.6
1966 Karl E. Mundt (R) R+32.6
1962 George McGovern (D) D+0.2
1960 Karl E. Mundt (R) R+4.9
1956 Francis Case (R) R+1.6
1954 Karl E. Mundt (R) R+14.6
1950 Francis Case (R) R+27.8
1948 Karl E. Mundt (R) R+18.7
1944 Chandler Gurney (R) R+27.7
1942 Harlan J. Bushfield (R) R+17.5
1938 Chandler Gurney (R) R+4.9
1936 William J. Bulow (D) D+2.1
1932 Peter Norbeck (R) R+9.3
1930 William J. Bulow (D) D+3.3
1926 Peter Norbeck (R) R+26.2
1924 William H. McMaster (R) R+13.3
1920 Peter Norbeck (R) R+30.1
1918 Thomas Sterling (R) R+16.1
1914 Edwin S. Johnson (D) D+3.5