Harry S. Truman carried Iowa D+2.7.

Harry S. Truman (D) vs Thomas E. Dewey (R) in Iowa, 1948. The state ran 1.8 points more Republican than the nation (D+4.5 nationally).

Nominees: Harry S. Truman (D) · Thomas E. Dewey (R) · Strom Thurmond (States' Rights Democratic)

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Iowa result

1,038,264 votes counted

Truman (D)

522,380

50.3%

Dewey (R)

494,018

47.6%

Thurmond + others

21,866

2.1%

Margin

D+2.7

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1948 presidential election

Iowa, 1948

TrumanD+2.7

How it voted

Share of the 1948 vote

Harry S. Truman ✓Democratic	50.3%	522,380
Thomas E. DeweyRepublican	47.6%	494,018
Strom ThurmondStates' Rights	2.1%	21,866

D+60

R+60

99 counties, each filled by 1948 D-vs-R margin. Hover any county for its result.

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Iowa's presidential margins

1892–2024, the 1948 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 — 1948

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

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County	Won	Margin	Democratic	Republican	Total
Adair County	R	−5.6%	2,567	2,879	5,523
Adams County	R	−8.1%	1,817	2,142	4,012
Allamakee County	R	−16.9%	3,172	4,474	7,726
Appanoose County	D	+9.9%	4,998	4,078	9,296
Audubon County	D	+12.9%	2,840	2,177	5,153
Benton County	D	+5.2%	4,209	3,770	8,367
Black Hawk County	D	+9.8%	19,603	16,041	36,230
Boone County	D	+13.3%	5,541	4,183	10,222
Bremer County	R	−4.5%	3,502	3,837	7,433
Buchanan County	R	−2.1%	4,127	4,310	8,523
Buena Vista County	D	+4.5%	4,340	3,959	8,493
Butler County	R	−5.7%	3,008	3,380	6,513
Calhoun County	D	+1.3%	3,164	3,083	6,398
Carroll County	D	+17.7%	5,711	3,974	9,786
Cass County	R	−20.3%	3,372	5,106	8,559
Cedar County	R	−14.2%	2,958	3,957	7,016
Cerro Gordo County	D	+9.6%	9,544	7,840	17,682
Cherokee County	D	+5.9%	3,739	3,318	7,144
Chickasaw County	D	+8.2%	4,071	3,449	7,589
Clarke County	R	−2.1%	2,101	2,195	4,379
Clay County	D	+8.8%	3,649	3,036	6,961
Clayton County	R	−2.9%	4,857	5,151	10,111
Clinton County	R	−7.1%	8,534	9,859	18,665
Crawford County	D	+9.6%	3,983	3,267	7,485
Dallas County	D	+7.9%	5,661	4,810	10,819
Davis County	D	+13.3%	2,982	2,276	5,305
Decatur County	D	+10.8%	3,172	2,547	5,803
Delaware County	R	−22.4%	2,876	4,555	7,498
Des Moines County	D	+7.0%	8,792	7,621	16,729
Dickinson County	D	+0.4%	2,324	2,304	4,766
Dubuque County	D	+20.9%	15,521	10,111	25,913
Emmet County	D	+5.4%	2,752	2,464	5,313
Fayette County	R	−8.4%	5,303	6,296	11,760
Floyd County	R	−11.3%	3,688	4,644	8,497
Franklin County	D	+2.6%	2,871	2,716	6,021
Fremont County	R	−1.1%	2,637	2,698	5,378
Greene County	R	−1.8%	2,946	3,059	6,290
Grundy County	R	−14.3%	2,344	3,154	5,647
Guthrie County	D	+0.0%	3,392	3,389	6,891
Hamilton County	D	+1.1%	3,613	3,535	7,345
Hancock County	D	+4.9%	3,096	2,802	6,051
Hardin County	R	−6.0%	4,023	4,553	8,854
Harrison County	D	+3.0%	4,608	4,341	9,016
Henry County	R	−20.2%	3,042	4,620	7,805
Howard County	D	+12.3%	3,378	2,630	6,090
Humboldt County	D	+6.6%	2,855	2,498	5,432
Ida County	D	+2.3%	2,365	2,257	4,698
Iowa County	R	−9.0%	3,030	3,659	6,978
Jackson County	R	−4.8%	3,263	3,597	7,005
Jasper County	D	+7.6%	6,684	5,710	12,786
Jefferson County	R	−12.3%	3,033	3,906	7,088
Johnson County	D	+9.0%	8,611	7,139	16,303
Jones County	R	−4.5%	3,915	4,290	8,322
Keokuk County	R	−1.0%	4,118	4,201	8,475
Kossuth County	D	+17.9%	6,039	4,186	10,353
Lee County	D	+8.1%	9,201	7,801	17,212
Linn County	D	+0.3%	20,995	20,881	43,098
Louisa County	R	−10.7%	1,945	2,420	4,429
Lucas County	D	+0.7%	2,697	2,656	5,475
Lyon County	R	−6.9%	2,174	2,500	4,740
Madison County	R	−6.2%	2,827	3,207	6,123
Mahaska County	D	+1.0%	4,327	4,238	9,030
Marion County	D	+18.3%	6,300	4,312	10,870
Marshall County	R	−8.5%	5,602	6,698	12,833
Mills County	R	−15.0%	2,155	2,921	5,107
Mitchell County	R	−2.4%	2,873	3,021	6,119
Monona County	D	+12.5%	4,098	3,179	7,346
Monroe County	D	+18.1%	3,445	2,371	5,926
Montgomery County	R	−19.3%	2,751	4,084	6,910
Muscatine County	R	−4.6%	5,466	6,003	11,615
O'Brien County	R	−3.8%	3,421	3,697	7,326
Osceola County	D	+8.9%	2,123	1,772	3,939
Page County	R	−22.1%	3,567	5,638	9,374
Palo Alto County	D	+19.1%	3,858	2,594	6,601
Plymouth County	R	−7.0%	4,339	5,002	9,416
Pocahontas County	D	+18.2%	3,500	2,397	6,051
Polk County	D	+14.2%	45,289	33,742	81,379
Pottawattamie County	R	−4.0%	11,430	12,384	24,095
Poweshiek County	D	+5.2%	4,324	3,888	8,385
Ringgold County	R	−12.7%	1,922	2,487	4,459
Sac County	D	+2.6%	3,699	3,505	7,363
Scott County	R	−0.5%	16,661	16,842	34,081
Shelby County	D	+2.9%	3,499	3,301	6,935
Sioux County	R	−15.9%	4,042	5,597	9,801
Story County	R	−14.1%	6,152	8,307	15,251
Tama County	D	+3.5%	5,115	4,763	10,028
Taylor County	R	−14.8%	2,402	3,244	5,698
Union County	R	−12.4%	3,218	4,138	7,414
Van Buren County	R	−16.7%	1,917	2,702	4,688
Wapello County	D	+15.6%	10,841	7,875	18,976
Warren County	R	−5.2%	3,481	3,876	7,605
Washington County	R	−14.5%	3,485	4,680	8,245
Wayne County	D	+9.4%	3,314	2,738	6,123
Webster County	D	+15.0%	9,508	6,951	17,066
Winnebago County	R	−0.2%	2,626	2,636	5,451
Winneshiek County	D	+3.2%	4,905	4,594	9,663
Woodbury County	D	+13.8%	22,056	16,655	39,084
Worth County	D	+16.1%	2,623	1,878	4,637
Wright County	D	+0.7%	3,866	3,810	7,800