Ronald Reagan carried South Dakota R+26.5.

Walter Mondale (D) vs Ronald Reagan (R) in South Dakota, 1984. The state ran 8.3 points more Republican than the nation (R+18.2 nationally). A US Senate contest shared the 1984 ballot here.

Nominees: Walter Mondale (D) · Ronald Reagan (R)

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South Dakota result

317,867 votes counted

Mondale (D)

116,113

36.5%

Reagan (R)

200,267

63.0%

All others

1,487

0.5%

Margin

R+26.5

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1984 presidential election

South Dakota, 1984

ReaganR+26.5

How it voted

Share of the 1984 vote

Ronald Reagan ✓Republican	63.0%	200,267
Walter MondaleDemocratic	36.5%	116,113
OtherAll other candidates	0.5%	1,487

D+60

R+60

66 counties, each filled by 1984 D-vs-R margin. Hover any county for its result.

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South Dakota's presidential margins

1892–2024, the 1984 contest in context

South Dakota's presidential margins

Year	Margin (D minus R)
1892	−36.5%
1896	+0.2%
1900	−15.6%
1904	−49.4%
1908	−23.8%
1912	+42.1%
1916	−3.9%
1920	−41.0%
1924	−36.3%
1928	−21.0%
1932	+29.2%
1936	+11.5%
1940	−14.8%
1944	−16.7%
1948	−4.8%
1952	−38.5%
1956	−16.8%
1960	−16.4%
1964	+11.2%
1968	−11.3%
1972	−8.6%
1976	−1.5%
1980	−28.8%
1984	−26.5%
1988	−6.3%
1992	−3.5%
1996	−3.5%
2000	−22.7%
2004	−21.3%
2008	−8.4%
2012	−18.0%
2016	−29.8%
2020	−26.2%
2024	−29.2%

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County results — 1984

66 counties; every row links to the county's full page.

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County	Won	Margin	Democratic	Republican	Total
Aurora County	R	−10.0%	840	1,029	1,883
Beadle County	R	−25.0%	3,523	5,876	9,422
Bennett County	R	−30.6%	453	856	1,316
Bon Homme County	R	−27.4%	1,408	2,478	3,906
Brookings County	R	−24.0%	4,089	6,679	10,814
Brown County	R	−21.1%	6,852	10,541	17,465
Brule County	R	−24.1%	961	1,578	2,556
Buffalo County	R	−3.4%	236	253	494
Butte County	R	−56.7%	784	2,865	3,667
Campbell County	R	−65.4%	214	1,035	1,255
Charles Mix County	R	−17.1%	1,879	2,660	4,563
Clark County	R	−29.0%	960	1,748	2,718
Clay County	R	−6.0%	2,711	3,057	5,808
Codington County	R	−26.7%	3,528	6,108	9,678
Corson County	R	−9.3%	792	955	1,753
Custer County	R	−43.3%	858	2,183	3,063
Davison County	R	−19.1%	3,248	4,783	8,048
Day County	R	−5.3%	1,932	2,150	4,101
Deuel County	R	−23.9%	941	1,537	2,490
Dewey County	R	−9.8%	772	941	1,727
Douglas County	R	−52.2%	536	1,713	2,254
Edmunds County	R	−21.2%	1,007	1,553	2,570
Fall River County	R	−41.3%	1,135	2,748	3,905
Faulk County	R	−31.9%	579	1,124	1,706
Grant County	R	−26.0%	1,606	2,738	4,360
Gregory County	R	−38.8%	780	1,777	2,569
Haakon County	R	−66.0%	237	1,168	1,410
Hamlin County	R	−29.7%	963	1,782	2,761
Hand County	R	−41.0%	846	2,030	2,886
Hanson County	R	−17.8%	625	898	1,530
Harding County	R	−58.9%	186	723	912
Hughes County	R	−41.1%	2,072	4,985	7,089
Hutchinson County	R	−46.2%	1,237	3,372	4,624
Hyde County	R	−38.9%	350	797	1,148
Jackson County	R	−42.2%	365	903	1,275
Jerauld County	R	−30.1%	542	1,012	1,562
Jones County	R	−53.7%	206	689	899
Kingsbury County	R	−25.8%	1,249	2,121	3,383
Lake County	R	−12.2%	2,367	3,027	5,413
Lawrence County	R	−39.5%	2,565	5,949	8,569
Lincoln County	R	−20.5%	2,626	3,988	6,636
Lyman County	R	−40.0%	478	1,120	1,605
Marshall County	R	−15.8%	1,111	1,529	2,649
McCook County	R	−13.5%	1,448	1,902	3,362
McPherson County	R	−62.4%	418	1,813	2,236
Meade County	R	−47.4%	2,093	5,908	8,041
Mellette County	R	−33.8%	303	616	927
Miner County	R	−2.2%	960	1,004	1,977
Minnehaha County	R	−12.9%	23,042	29,908	53,171
Moody County	R	−1.5%	1,586	1,633	3,228
Oglala Lakota County	D	+63.7%	1,489	324	1,829
Pennington County	R	−45.2%	8,224	21,947	30,389
Perkins County	R	−40.3%	714	1,686	2,411
Potter County	R	−52.5%	482	1,551	2,035
Roberts County	R	−14.5%	2,063	2,767	4,840
Sanborn County	R	−27.7%	611	1,080	1,695
Spink County	R	−21.9%	1,680	2,627	4,324
Stanley County	R	−45.5%	351	942	1,299
Sully County	R	−51.5%	266	836	1,107
Todd County	D	+20.0%	1,022	679	1,714
Tripp County	R	−45.0%	935	2,483	3,440
Turner County	R	−34.8%	1,486	3,086	4,592
Union County	R	−4.5%	2,221	2,431	4,677
Walworth County	R	−50.6%	779	2,396	3,194
Yankton County	R	−27.4%	2,932	5,161	8,145
Ziebach County	R	−8.8%	359	429	792