Wendell Willkie carried Iowa R+4.4.

Franklin D. Roosevelt (D) vs Wendell Willkie (R) in Iowa, 1940. The state ran 14.4 points more Republican than the nation (D+9.9 nationally).

Nominees: Franklin D. Roosevelt (D) · Wendell Willkie (R)

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Iowa result

1,215,432 votes counted

Roosevelt (D)

578,802

47.6%

Willkie (R)

632,370

52.0%

All others

4,260

0.4%

Margin

R+4.4

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1940 presidential election

Iowa, 1940

WillkieR+4.4

How it voted

Share of the 1940 vote

Wendell Willkie ✓Republican	52.0%	632,370
Franklin D. RooseveltDemocratic	47.6%	578,802
OtherAll other candidates	0.4%	4,260

D+60

R+60

99 counties, each filled by 1940 D-vs-R margin. Hover any county for its result.

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Iowa's presidential margins

1892–2024, the 1940 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 — 1940

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

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County	Won	Margin	Democratic	Republican	Total
Adair County	R	−17.6%	2,734	3,907	6,648
Adams County	R	−20.7%	2,088	3,182	5,292
Allamakee County	R	−28.3%	3,258	5,840	9,122
Appanoose County	D	+0.3%	6,069	6,032	12,202
Audubon County	D	+10.3%	3,236	2,632	5,875
Benton County	D	+0.6%	5,363	5,298	10,693
Black Hawk County	D	+0.5%	17,305	17,132	34,532
Boone County	D	+15.6%	7,168	5,227	12,469
Bremer County	R	−26.7%	3,103	5,374	8,495
Buchanan County	R	−9.5%	4,649	5,630	10,309
Buena Vista County	D	+2.2%	4,784	4,576	9,399
Butler County	R	−27.4%	2,760	4,848	7,628
Calhoun County	D	+6.8%	4,344	3,792	8,161
Carroll County	D	+1.4%	5,526	5,376	10,923
Cass County	R	−25.7%	3,763	6,377	10,172
Cedar County	R	−25.2%	3,293	5,521	8,840
Cerro Gordo County	D	+5.4%	10,839	9,728	20,612
Cherokee County	R	−7.2%	3,855	4,458	8,332
Chickasaw County	R	−5.4%	3,981	4,440	8,423
Clarke County	R	−8.1%	2,513	2,962	5,510
Clay County	D	+8.2%	4,328	3,673	8,025
Clayton County	R	−19.9%	4,973	7,443	12,434
Clinton County	R	−8.6%	10,251	12,177	22,478
Crawford County	R	−12.2%	4,130	5,284	9,449
Dallas County	D	+0.5%	6,279	6,218	12,628
Davis County	D	+6.3%	3,374	2,975	6,377
Decatur County	D	+6.0%	3,938	3,494	7,448
Delaware County	R	−34.8%	2,985	6,175	9,176
Des Moines County	R	−25.0%	6,578	10,988	17,625
Dickinson County	D	+4.3%	2,985	2,736	5,742
Dubuque County	R	−2.8%	13,805	14,590	28,441
Emmet County	D	+0.7%	3,097	3,053	6,197
Fayette County	R	−15.1%	6,066	8,237	14,342
Floyd County	R	−16.6%	4,167	5,829	10,031
Franklin County	R	−1.1%	3,540	3,623	7,310
Fremont County	D	+1.1%	3,914	3,825	7,764
Greene County	R	−4.7%	3,566	3,920	7,506
Grundy County	R	−17.4%	2,745	3,908	6,674
Guthrie County	R	−15.1%	3,489	4,733	8,255
Hamilton County	D	+11.5%	5,279	4,183	9,501
Hancock County	R	−1.6%	3,514	3,632	7,173
Hardin County	R	−8.8%	4,764	5,692	10,491
Harrison County	R	−6.8%	5,317	6,094	11,428
Henry County	R	−34.9%	2,837	5,893	8,749
Howard County	R	−0.5%	3,675	3,714	7,405
Humboldt County	D	+6.8%	3,268	2,853	6,143
Ida County	R	−15.7%	2,306	3,166	5,487
Iowa County	R	−12.3%	3,649	4,696	8,488
Jackson County	R	−12.4%	4,218	5,417	9,661
Jasper County	D	+5.8%	8,129	7,240	15,421
Jefferson County	R	−17.9%	3,402	4,891	8,336
Johnson County	D	+11.1%	9,017	7,206	16,278
Jones County	R	−13.7%	4,273	5,630	9,929
Keokuk County	R	−8.4%	4,552	5,394	9,988
Kossuth County	D	+7.1%	6,502	5,639	12,165
Lee County	R	−7.6%	9,117	10,616	19,766
Linn County	R	−9.4%	19,531	23,581	43,235
Louisa County	R	−19.2%	2,247	3,330	5,627
Lucas County	R	−7.7%	3,255	3,806	7,149
Lyon County	R	−18.8%	2,648	3,880	6,540
Madison County	R	−18.2%	3,094	4,477	7,600
Mahaska County	R	−3.1%	5,757	6,123	11,977
Marion County	D	+9.0%	6,915	5,763	12,753
Marshall County	R	−13.3%	6,497	8,503	15,065
Mills County	R	−15.0%	2,862	3,873	6,749
Mitchell County	R	−13.2%	3,025	3,947	6,987
Monona County	D	+6.6%	4,783	4,192	8,990
Monroe County	D	+9.9%	3,994	3,270	7,336
Montgomery County	R	−18.4%	3,332	4,848	8,220
Muscatine County	R	−18.8%	5,825	8,543	14,421
O'Brien County	R	−7.0%	4,133	4,760	8,931
Osceola County	R	−2.9%	2,288	2,425	4,742
Page County	R	−28.6%	4,102	7,407	11,566
Palo Alto County	D	+14.8%	4,482	3,322	7,822
Plymouth County	R	−33.6%	3,831	7,725	11,579
Pocahontas County	D	+15.9%	4,118	2,985	7,121
Polk County	D	+11.2%	51,647	41,245	93,193
Pottawattamie County	R	−2.3%	15,221	15,929	31,188
Poweshiek County	D	+0.2%	4,794	4,773	9,611
Ringgold County	R	−19.2%	2,374	3,507	5,894
Sac County	R	−7.4%	3,754	4,358	8,121
Scott County	D	+6.3%	20,996	18,504	39,630
Shelby County	R	−9.5%	3,811	4,613	8,460
Sioux County	R	−29.3%	4,144	7,585	11,750
Story County	R	−4.7%	7,152	7,853	15,070
Tama County	D	+1.1%	5,996	5,865	11,893
Taylor County	R	−19.5%	2,976	4,420	7,421
Union County	R	−25.3%	3,229	5,421	8,668
Van Buren County	R	−25.8%	2,416	4,108	6,550
Wapello County	D	+13.5%	11,880	9,039	21,006
Warren County	R	−13.0%	3,856	5,016	8,923
Washington County	R	−16.7%	4,030	5,649	9,721
Wayne County	R	−1.7%	3,625	3,748	7,401
Webster County	D	+17.1%	10,731	7,583	18,366
Winnebago County	R	−4.0%	3,051	3,308	6,388
Winneshiek County	R	−6.9%	5,405	6,208	11,637
Woodbury County	D	+3.4%	24,457	22,832	47,378
Worth County	D	+10.5%	3,007	2,434	5,455
Wright County	D	+4.6%	4,871	4,443	9,350