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United States · Election results history · 1940 president · South Dakota
Election 1940 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.

1940 presidential election in South Dakota

Wendell Willkie (Republican) beat Franklin D. Roosevelt (Democrat) in South Dakota in 1940, 57.4% to 42.6%, a margin of 14.8 points and 45,703 votes.

South Dakota voted 24.8 points more Republican than the country as a whole, where the margin was D+10.0.

South Dakota changed party: in 1936 it went Democratic, for Franklin D. Roosevelt.

Republicans led in 59 of the 68 counties as they stood then and Democrats in 9. The largest, Minnehaha, cast 28,923 votes and went to the Republican by 15.2 points. The closest was Ziebach, where 4 votes separated the two parties.

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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.

Result

CandidatePartyVotesShare
Wendell Willkie won Republican 177,065 57.4%
Franklin D. Roosevelt Democratic 131,362 42.6%
Total308,427

Every county

CountyDemocratRepublicanOthersTotalMargin
Minnehaha 12,259 42.4% 16,664 57.6% 28,923 R+15.2
Brown 8,048 55.0% 6,598 45.0% 14,646 D+9.9
Pennington 4,878 42.5% 6,603 57.5% 11,481 R+15.0
Beadle 5,253 54.7% 4,356 45.3% 9,609 D+9.3
Lawrence 3,515 39.9% 5,288 60.1% 8,803 R+20.1
Codington 3,705 46.2% 4,320 53.8% 8,025 R+7.7
Davison 4,230 53.6% 3,659 46.4% 7,889 D+7.2
Brookings 2,671 34.7% 5,016 65.3% 7,687 R+30.5
Roberts 3,750 51.7% 3,504 48.3% 7,254 D+3.4
Yankton 3,064 42.3% 4,179 57.7% 7,243 R+15.4
Day 3,297 50.2% 3,277 49.8% 6,574 D+0.3
Turner 1,774 27.6% 4,644 72.4% 6,418 R+44.7
Charles Mix 3,303 52.5% 2,993 47.5% 6,296 D+4.9
Hutchinson 1,103 17.9% 5,051 82.1% 6,154 R+64.2
Lincoln 2,048 33.4% 4,081 66.6% 6,129 R+33.2
Spink 3,134 51.3% 2,975 48.7% 6,109 D+2.6
Lake 1,889 31.1% 4,179 68.9% 6,068 R+37.7
Union 2,608 45.6% 3,116 54.4% 5,724 R+8.9
Bon Homme 2,463 44.7% 3,046 55.3% 5,509 R+10.6
Kingsbury 1,503 29.7% 3,551 70.3% 5,054 R+40.5
Grant 2,039 40.6% 2,981 59.4% 5,020 R+18.8
McCook 1,696 33.9% 3,310 66.1% 5,006 R+32.2
Clay 2,266 47.9% 2,463 52.1% 4,729 R+4.2
Tripp 2,089 45.6% 2,492 54.4% 4,581 R+8.8
Moody 1,820 39.8% 2,749 60.2% 4,569 R+20.3
Gregory 2,035 45.1% 2,478 54.9% 4,513 R+9.8
Meade 1,931 43.0% 2,560 57.0% 4,491 R+14.0
Clark 1,624 38.2% 2,622 61.8% 4,246 R+23.5
Marshall 1,972 49.8% 1,989 50.2% 3,961 R+0.4
Fall River 1,405 36.7% 2,420 63.3% 3,825 R+26.5
Edmunds 1,443 38.1% 2,341 61.9% 3,784 R+23.7
McPherson 826 22.5% 2,839 77.5% 3,665 R+54.9
Hand 1,608 44.5% 2,002 55.5% 3,610 R+10.9
Hamlin 1,282 36.0% 2,279 64.0% 3,561 R+28.0
Butte 1,384 39.0% 2,164 61.0% 3,548 R+22.0
Walworth 1,565 44.9% 1,921 55.1% 3,486 R+10.2
Deuel 1,166 33.6% 2,304 66.4% 3,470 R+32.8
Miner 1,365 39.5% 2,095 60.5% 3,460 R+21.1
Hughes 1,362 40.7% 1,982 59.3% 3,344 R+18.5
Brule 1,835 57.6% 1,352 42.4% 3,187 D+15.2
Sanborn 1,398 44.7% 1,732 55.3% 3,130 R+10.7
Perkins 1,321 42.6% 1,777 57.4% 3,098 R+14.7
Corson 1,328 43.7% 1,709 56.3% 3,037 R+12.5
Douglas 1,040 34.5% 1,977 65.5% 3,017 R+31.1
Custer 1,151 39.1% 1,796 60.9% 2,947 R+21.9
Aurora 1,385 49.6% 1,408 50.4% 2,793 R+0.8
Faulk 1,199 45.6% 1,431 54.4% 2,630 R+8.8
Hanson 1,216 46.3% 1,408 53.7% 2,624 R+7.3
Lyman 1,105 44.0% 1,409 56.0% 2,514 R+12.1
Jerauld 919 36.8% 1,576 63.2% 2,495 R+26.3
Todd 1,238 49.9% 1,245 50.1% 2,483 R+0.3
Dewey 1,081 43.6% 1,396 56.4% 2,477 R+12.7
Potter 1,054 45.2% 1,278 54.8% 2,332 R+9.6
Campbell 416 19.4% 1,733 80.6% 2,149 R+61.3
Mellette 905 47.8% 990 52.2% 1,895 R+4.5
Shannon 791 42.0% 1,094 58.0% 1,885 R+16.1
Haakon 707 38.5% 1,129 61.5% 1,836 R+23.0
Bennett 860 48.5% 915 51.5% 1,775 R+3.1
Hyde 670 39.7% 1,018 60.3% 1,688 R+20.6
Harding 670 47.0% 755 53.0% 1,425 R+6.0
Ziebach 687 49.9% 691 50.1% 1,378 R+0.3
Jones 508 37.9% 832 62.1% 1,340 R+24.2
Sully 458 35.3% 840 64.7% 1,298 R+29.4
Stanley 541 44.3% 679 55.7% 1,220 R+11.3
Jackson 435 41.2% 620 58.8% 1,055 R+17.5
Buffalo 395 44.6% 491 55.4% 886 R+10.8
Washabaugh (Ext) 374 51.1% 358 48.9% 732 D+2.2
Washington (Ext) 302 47.4% 335 52.6% 637 R+5.2

Counties as they stood in 1940; some have since been split, merged or renamed. Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

South Dakota in every presidential election we hold

YearWinnerMargin
2024 Donald Trump (R) R+29.2
2020 Donald Trump (R) R+26.2
2016 Donald Trump (R) R+29.8
2012 Mitt Romney (R) R+18.0
2008 John McCain (R) R+8.4
2004 George W. Bush (R) R+21.5
2000 George W. Bush (R) R+22.7
1996 Bob Dole (R) R+3.5
1992 George H. W. Bush (R) R+3.5
1988 George H. W. Bush (R) R+6.3
1984 Ronald Reagan (R) R+26.5
1980 Ronald Reagan (R) R+28.8
1976 Gerald Ford (R) R+1.5
1972 Richard Nixon (R) R+8.6
1968 Richard Nixon (R) R+11.3
1964 Lyndon B. Johnson (D) D+11.2
1960 Richard Nixon (R) R+16.4
1956 Dwight D. Eisenhower (R) R+16.8
1952 Dwight D. Eisenhower (R) R+38.5
1948 Thomas E. Dewey (R) R+4.8
1944 Thomas E. Dewey (R) R+16.7
1940 Wendell Willkie (R) R+14.8
1936 Franklin D. Roosevelt (D) D+11.5
1932 Franklin D. Roosevelt (D) D+29.2
1928 Herbert Hoover (R) R+21.0
1924 Calvin Coolidge (R) R+36.3
1920 Warren G. Harding (R) R+41.0
1916 Charles Evans Hughes (R) R+3.9
1912 Theodore Roosevelt (other)
1908 William Howard Taft (R) R+23.8
1904 Theodore Roosevelt (R) R+49.4
1900 William McKinley (R) R+15.6
1896 William Jennings Bryan (D) D+0.2
1892 Benjamin Harrison (R) R+36.6