# 1940 United States presidential election in South Dakota

"none" is preferred when the title is sufficiently descriptive; see [[WP:SDNONE]]
Elections in South Dakota :
Federal government
Presidential elections
1892
1896
1900
1904
1908
1912
1916
1920
1924
1928
1932
1936
1940
1944
1948
1952
1956
1960
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
2012
2016
2020
2024
Presidential primaries
Democratic
2004
2008
2016
2020
2024
Republican
2008
2016
2024
U.S. Senate elections
1889
1891
1894
1897
1901
1903
1903 sp
1907
1909
1913
1914
1918
1920
1924
1926
1930
1932
1936
1938
1938 sp
1942
1944
1948
1950
1954
1956
1960
1962
1966
1968
1972
1974
1978
1980
1984
1986
1990
1992
1996
1998
2002
2004
2008
2010
2014
2016
2020
2022
2026
U.S. House elections
1889
1890
1891
AL sp
1892
1894
1896
1898
1900
1902
1904
1906
1908
AL sp
1910
1912
1914
1916
1918
1920
1922
1924
1926
1928
1930
1932
1934
1936
1938
1940
1942
1944
1946
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
AL sp
2006
2008
2010
2012
2014
2016
2018
2020
2022 :
State government
General elections
2010
2014
2018
2020
2022
Gubernatorial elections
1889
1890
1892
1894
1896
1898
1900
1902
1904
1906
1908
1910
1912
1914
1916
1918
1920
1922
1924
1926
1928
1930
1932
1934
1936
1938
1940
1942
1944
1946
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1978
1982
1986
1990
1994
1998
2002
2006
2010
2014
2018
2022
Secretary of State elections
2022
Attorney General elections
2018
2022
Senate elections
2020
2022
House of Representatives elections
2020
2022 :
Ballot measures
2006
Amendment C
2008
Measure 9
Measure 10
2020
Amendment A
Measure 26
2024
Amendment E
Amendment G
Amendment H :
Sioux Falls
City elections
2010
2012
2014
2016
2018
2020
2022
2024
Mayoral elections
1974
1978
1982
1986
1990
1994
1998
2002
2006
2010
2014
2018
2022 :
Rapid City
City elections
2020
2022
2024
2026
Mayoral elections
2022 :
Pierre
City elections
2020
2022
2024
2026
Mayoral elections
2022 :
vte :
The 1940 United States presidential election in South Dakota took place on November 5, 1940, as part of the 1940 United States presidential election. Voters chose four representatives, or electors, to the Electoral College, who voted for president and vice president.
South Dakota was won by Wendell Willkie (R–New York), running with Minority Leader Charles L. McNary, with 57.41% of the popular vote, against incumbent President Franklin D. Roosevelt (D–New York), running with Secretary Henry A. Wallace, with 42.59% of the popular vote.
South Dakota would prove to be Willkie's largest win of any state, as he carried the state by 14.82 percentage points, despite Roosevelt carrying it by 12 percentage points four years prior. Additionally, with 57.41% of the popular vote, South Dakota was Willkie's strongest state in the 1940 election in terms of popular vote percentage.

## Results

1940 United States presidential election in South Dakota :
| Party | Party | Candidate | Votes | % |
| | Republican | Wendell Willkie | 177,065 | 57.41% |
| | Democratic | Franklin D. Roosevelt (inc.) | 131,362 | 42.59% |
| Total votes | Total votes | Total votes | 308,427 | 100% |

### Results by county

| County | Wendell Lewis Willkie Republican | Wendell Lewis Willkie Republican | Franklin Delano Roosevelt Democratic | Franklin Delano Roosevelt Democratic | Margin | Margin | Total votes cast |
| County | # | % | # | % | # | % | Total votes cast |
| Aurora | 1,408 | 50.41% | 1,385 | 49.59% | 23 | 0.82% | 2,793 |
| Beadle | 4,356 | 45.33% | 5,253 | 54.67% | -897 | -9.33% | 9,609 |
| Bennett | 915 | 51.55% | 860 | 48.45% | 55 | 3.10% | 1,775 |
| Bon Homme | 3,046 | 55.29% | 2,463 | 44.71% | 583 | 10.58% | 5,509 |
| Brookings | 5,016 | 65.25% | 2,671 | 34.75% | 2,345 | 30.51% | 7,687 |
| Brown | 6,598 | 45.05% | 8,048 | 54.95% | -1,450 | -9.90% | 14,646 |
| Brule | 1,352 | 42.42% | 1,835 | 57.58% | -483 | -15.16% | 3,187 |
| Buffalo | 491 | 55.42% | 395 | 44.58% | 96 | 10.84% | 886 |
| Butte | 2,164 | 60.99% | 1,384 | 39.01% | 780 | 21.98% | 3,548 |
| Campbell | 1,733 | 80.64% | 416 | 19.36% | 1,317 | 61.28% | 2,149 |
| Charles Mix | 2,993 | 47.54% | 3,303 | 52.46% | -310 | -4.92% | 6,296 |
| Clark | 2,622 | 61.75% | 1,624 | 38.25% | 998 | 23.50% | 4,246 |
| Clay | 2,463 | 52.08% | 2,266 | 47.92% | 197 | 4.17% | 4,729 |
| Codington | 4,320 | 53.83% | 3,705 | 46.17% | 615 | 7.66% | 8,025 |
| Corson | 1,709 | 56.27% | 1,328 | 43.73% | 381 | 12.55% | 3,037 |
| Custer | 1,796 | 60.94% | 1,151 | 39.06% | 645 | 21.89% | 2,947 |
| Davison | 3,659 | 46.38% | 4,230 | 53.62% | -571 | -7.24% | 7,889 |
| Day | 3,277 | 49.85% | 3,297 | 50.15% | -20 | -0.30% | 6,574 |
| Deuel | 2,304 | 66.40% | 1,166 | 33.60% | 1,138 | 32.80% | 3,470 |
| Dewey | 1,396 | 56.36% | 1,081 | 43.64% | 315 | 12.72% | 2,477 |
| Douglas | 1,977 | 65.53% | 1,040 | 34.47% | 937 | 31.06% | 3,017 |
| Edmunds | 2,341 | 61.87% | 1,443 | 38.13% | 898 | 23.73% | 3,784 |
| Fall River | 2,420 | 63.27% | 1,405 | 36.73% | 1,015 | 26.54% | 3,825 |
| Faulk | 1,431 | 54.41% | 1,199 | 45.59% | 232 | 8.82% | 2,630 |
| Grant | 2,981 | 59.38% | 2,039 | 40.62% | 942 | 18.76% | 5,020 |
| Gregory | 2,478 | 54.91% | 2,035 | 45.09% | 443 | 9.82% | 4,513 |
| Haakon | 1,129 | 61.49% | 707 | 38.51% | 422 | 22.98% | 1,836 |
| Hamlin | 2,279 | 64.00% | 1,282 | 36.00% | 997 | 28.00% | 3,561 |
| Hand | 2,002 | 55.46% | 1,608 | 44.54% | 394 | 10.91% | 3,610 |
| Hanson | 1,408 | 53.66% | 1,216 | 46.34% | 192 | 7.32% | 2,624 |
| Harding | 755 | 52.98% | 670 | 47.02% | 85 | 5.96% | 1,425 |
| Hughes | 1,982 | 59.27% | 1,362 | 40.73% | 620 | 18.54% | 3,344 |
| Hutchinson | 5,051 | 82.08% | 1,103 | 17.92% | 3,948 | 64.15% | 6,154 |
| Hyde | 1,018 | 60.31% | 670 | 39.69% | 348 | 20.62% | 1,688 |
| Jackson | 620 | 58.77% | 435 | 41.23% | 185 | 17.54% | 1,055 |
| Jerauld | 1,576 | 63.17% | 919 | 36.83% | 657 | 26.33% | 2,495 |
| Jones | 832 | 62.09% | 508 | 37.91% | 324 | 24.18% | 1,340 |
| Kingsbury | 3,551 | 70.26% | 1,503 | 29.74% | 2,048 | 40.52% | 5,054 |
| Lake | 4,179 | 68.87% | 1,889 | 31.13% | 2,290 | 37.74% | 6,068 |
| Lawrence | 5,288 | 60.07% | 3,515 | 39.93% | 1,773 | 20.14% | 8,803 |
| Lincoln | 4,081 | 66.59% | 2,048 | 33.41% | 2,033 | 33.17% | 6,129 |
| Lyman | 1,409 | 56.05% | 1,105 | 43.95% | 304 | 12.09% | 2,514 |
| Marshall | 1,989 | 50.21% | 1,972 | 49.79% | 17 | 0.43% | 3,961 |
| McCook | 3,310 | 66.12% | 1,696 | 33.88% | 1,614 | 32.24% | 5,006 |
| McPherson | 2,839 | 77.46% | 826 | 22.54% | 2,013 | 54.92% | 3,665 |
| Meade | 2,560 | 57.00% | 1,931 | 43.00% | 629 | 14.01% | 4,491 |
| Mellette | 990 | 52.24% | 905 | 47.76% | 85 | 4.49% | 1,895 |
| Miner | 2,095 | 60.55% | 1,365 | 39.45% | 730 | 21.10% | 3,460 |
| Minnehaha | 16,664 | 57.62% | 12,259 | 42.38% | 4,405 | 15.23% | 28,923 |
| Moody | 2,749 | 60.17% | 1,820 | 39.83% | 929 | 20.33% | 4,569 |
| Pennington | 6,603 | 57.51% | 4,878 | 42.49% | 1,725 | 15.02% | 11,481 |
| Perkins | 1,777 | 57.36% | 1,321 | 42.64% | 456 | 14.72% | 3,098 |
| Potter | 1,278 | 54.80% | 1,054 | 45.20% | 224 | 9.61% | 2,332 |
| Roberts | 3,504 | 48.30% | 3,750 | 51.70% | -246 | -3.39% | 7,254 |
| Sanborn | 1,732 | 55.34% | 1,398 | 44.66% | 334 | 10.67% | 3,130 |
| Shannon | 1,094 | 58.04% | 791 | 41.96% | 303 | 16.07% | 1,885 |
| Spink | 2,975 | 48.70% | 3,134 | 51.30% | -159 | -2.60% | 6,109 |
| Stanley | 679 | 55.66% | 541 | 44.34% | 138 | 11.31% | 1,220 |
| Sully | 840 | 64.71% | 458 | 35.29% | 382 | 29.43% | 1,298 |
| Todd | 1,245 | 50.14% | 1,238 | 49.86% | 7 | 0.28% | 2,483 |
| Tripp | 2,492 | 54.40% | 2,089 | 45.60% | 403 | 8.80% | 4,581 |
| Turner | 4,644 | 72.36% | 1,774 | 27.64% | 2,870 | 44.72% | 6,418 |
| Union | 3,116 | 54.44% | 2,608 | 45.56% | 508 | 8.87% | 5,724 |
| Walworth | 1,921 | 55.11% | 1,565 | 44.89% | 356 | 10.21% | 3,486 |
| Washabaugh | 358 | 48.91% | 374 | 51.09% | -16 | -2.19% | 732 |
| Washington | 335 | 52.59% | 302 | 47.41% | 33 | 5.18% | 637 |
| Yankton | 4,179 | 57.70% | 3,064 | 42.30% | 1,115 | 15.39% | 7,243 |
| Ziebach | 691 | 50.15% | 687 | 49.85% | 4 | 0.29% | 1,378 |
| Armstrong | 0 | N/A | 0 | N/A | N/A | N/A | 0 |
| Totals | 177,065 | 57.41% | 131,362 | 42.59% | 45,703 | 14.82% | 308,427 |

#### Counties that flipped from Democratic to Republican

* Buffalo
* Bon Homme
* Clay
* Washington
* Ziebach
* Corson
* Deuel
* Grant
* Jerauld
* Marshall
* Miner
* Minnehaha
* Moody
* Sanborn
* Union
* Aurora
* Bennett
* Clark
* Codington
* Custer
* Haakon
* Douglas
* Edmunds
* Fall River
* Faulk
* Gregory
* Harding
* Hand
* Hanson
* Hughes
* Jones
* Perkins
* Jackson
* Lyman
* McCook
* Mellette
* Meade
* Pennington
* Potter
* Stanley
* Todd
* Tripp
* Walworth
* Yankton