Ronald Reagan carried Iowa R+7.4.

Walter Mondale (D) vs Ronald Reagan (R) in Iowa, 1984. The state ran 10.8 points more Democratic 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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Iowa result

1,319,805 votes counted

Mondale (D)

605,620

45.9%

Reagan (R)

703,088

53.3%

All others

11,097

0.8%

Margin

R+7.4

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1984 presidential election

Iowa, 1984

ReaganR+7.4

How it voted

Share of the 1984 vote

Ronald Reagan ✓Republican	53.3%	703,088
Walter MondaleDemocratic	45.9%	605,620
OtherAll other candidates	0.8%	11,097

D+60

R+60

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

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Iowa's presidential margins

1892–2024, the 1984 contest in context

Iowa's presidential margins

Year	Margin (D minus R)
1892	−5.3%
1896	−12.6%
1900	−18.6%
1904	−32.7%
1908	−15.0%
1912	+13.3%
1916	−11.4%
1920	−45.5%
1924	−38.6%
1928	−24.2%
1932	+17.7%
1936	+11.7%
1940	−4.4%
1944	−4.5%
1948	+2.7%
1952	−28.2%
1956	−18.4%
1960	−13.5%
1964	+24.0%
1968	−12.2%
1972	−17.1%
1976	−1.0%
1980	−12.7%
1984	−7.4%
1988	+10.2%
1992	+6.0%
1996	+10.3%
2000	+0.3%
2004	−0.7%
2008	+9.5%
2012	+5.8%
2016	−9.3%
2020	−8.2%
2024	−13.2%

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County results — 1984

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

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County	Won	Margin	Democratic	Republican	Total
Adair County	R	−13.8%	1,979	2,615	4,619
Adams County	R	−16.4%	1,221	1,706	2,960
Allamakee County	R	−27.0%	2,282	3,997	6,354
Appanoose County	R	−1.8%	3,289	3,412	6,759
Audubon County	R	−10.8%	1,854	2,306	4,195
Benton County	R	−5.4%	4,993	5,566	10,678
Black Hawk County	R	−1.2%	31,467	32,262	64,233
Boone County	D	+6.0%	6,485	5,746	12,277
Bremer County	R	−25.4%	4,084	6,895	11,055
Buchanan County	R	−9.1%	4,129	4,965	9,152
Buena Vista County	R	−11.5%	4,109	5,193	9,405
Butler County	R	−32.5%	2,323	4,570	6,924
Calhoun County	R	−13.1%	2,541	3,311	5,898
Carroll County	R	−0.6%	4,960	5,021	10,077
Cass County	R	−35.0%	2,417	5,053	7,531
Cedar County	R	−19.8%	3,086	4,617	7,748
Cerro Gordo County	D	+1.6%	11,570	11,214	22,950
Cherokee County	R	−9.3%	3,349	4,046	7,470
Chickasaw County	R	−6.9%	3,186	3,661	6,917
Clarke County	R	−5.4%	2,030	2,262	4,321
Clay County	R	−8.1%	3,774	4,450	8,316
Clayton County	R	−18.5%	3,446	5,029	8,553
Clinton County	R	−10.5%	11,240	13,914	25,404
Crawford County	R	−14.4%	3,396	4,552	8,053
Dallas County	D	+3.8%	6,564	6,080	12,707
Davis County	D	+5.5%	2,187	1,956	4,182
Decatur County	R	−0.1%	2,098	2,104	4,242
Delaware County	R	−20.1%	3,158	4,769	8,001
Des Moines County	D	+7.7%	11,173	9,559	20,850
Dickinson County	R	−14.5%	3,025	4,064	7,170
Dubuque County	D	+6.4%	21,876	19,239	41,491
Emmet County	R	−3.5%	2,746	2,946	5,725
Fayette County	R	−16.2%	4,677	6,505	11,302
Floyd County	R	−2.2%	4,154	4,341	8,553
Franklin County	R	−14.1%	2,349	3,129	5,545
Fremont County	R	−30.4%	1,426	2,686	4,147
Greene County	D	+4.5%	2,831	2,579	5,554
Grundy County	R	−40.1%	1,915	4,527	6,518
Guthrie County	R	−5.0%	2,517	2,783	5,363
Hamilton County	R	−12.3%	3,330	4,279	7,695
Hancock County	R	−13.9%	2,539	3,362	5,938
Hardin County	R	−7.4%	4,477	5,195	9,732
Harrison County	R	−27.0%	2,495	4,352	6,882
Henry County	R	−14.3%	3,377	4,516	7,955
Howard County	R	−11.9%	2,135	2,718	4,898
Humboldt County	R	−16.9%	2,406	3,396	5,863
Ida County	R	−25.2%	1,559	2,618	4,202
Iowa County	R	−21.2%	2,815	4,352	7,251
Jackson County	R	−4.4%	4,400	4,811	9,340
Jasper County	R	−3.3%	8,023	8,576	16,699
Jefferson County	R	−22.9%	2,961	4,727	7,725
Johnson County	D	+16.3%	26,000	18,677	45,044
Jones County	R	−12.3%	3,825	4,907	8,791
Keokuk County	R	−4.7%	2,649	2,913	5,656
Kossuth County	R	−0.3%	4,838	4,872	9,814
Lee County	D	+0.9%	8,912	8,756	17,809
Linn County	R	−3.2%	38,528	41,061	80,315
Louisa County	R	−15.2%	1,927	2,623	4,573
Lucas County	R	−4.1%	2,422	2,630	5,085
Lyon County	R	−49.2%	1,401	4,178	5,642
Madison County	R	−1.6%	3,067	3,168	6,261
Mahaska County	R	−19.2%	4,107	6,086	10,293
Marion County	R	−6.9%	6,313	7,259	13,634
Marshall County	R	−10.2%	8,809	10,839	19,840
Mills County	R	−46.7%	1,434	3,994	5,486
Mitchell County	R	−10.7%	2,531	3,144	5,743
Monona County	R	−11.8%	2,159	2,746	4,959
Monroe County	D	+9.7%	2,342	1,927	4,291
Montgomery County	R	−43.2%	1,661	4,224	5,930
Muscatine County	R	−20.3%	5,986	9,069	15,168
O'Brien County	R	−33.4%	2,479	5,008	7,569
Osceola County	R	−32.9%	1,146	2,285	3,463
Page County	R	−50.6%	1,914	5,876	7,828
Palo Alto County	D	+5.2%	3,018	2,715	5,810
Plymouth County	R	−30.1%	3,464	6,482	10,027
Pocahontas County	R	−2.8%	2,481	2,627	5,188
Polk County	D	+2.7%	75,413	71,413	147,848
Pottawattamie County	R	−27.0%	12,329	21,527	34,112
Poweshiek County	R	−6.9%	4,103	4,715	8,889
Ringgold County	D	+2.6%	1,593	1,512	3,117
Sac County	R	−16.3%	2,363	3,298	5,729
Scott County	R	−7.7%	32,550	38,034	71,212
Shelby County	R	−29.2%	2,291	4,200	6,537
Sioux County	R	−63.5%	2,585	11,665	14,293
Story County	R	−4.0%	18,277	19,804	38,410
Tama County	R	−9.1%	4,061	4,882	8,990
Taylor County	R	−24.8%	1,499	2,496	4,022
Union County	R	−10.8%	2,875	3,583	6,576
Van Buren County	R	−14.1%	1,606	2,138	3,769
Wapello County	D	+19.4%	10,545	7,098	17,800
Warren County	R	−0.6%	8,171	8,277	16,570
Washington County	R	−19.7%	3,079	4,613	7,770
Wayne County	R	−3.3%	1,927	2,061	4,021
Webster County	D	+1.6%	9,930	9,619	19,802
Winnebago County	R	−15.0%	2,669	3,616	6,314
Winneshiek County	R	−17.1%	3,724	5,277	9,105
Woodbury County	R	−9.6%	18,951	23,002	42,350
Worth County	D	+6.5%	2,263	1,985	4,266
Wright County	R	−10.4%	2,980	3,675	6,705