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United States · Election results history · 1948 Senate · Iowa
Election 1948 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

1948 US Senate election in Iowa

Guy M. Gillette (Democrat) beat George A. Wilson (Republican) in Iowa in 1948, 57.8% to 41.6%, a margin of 16.2 points and 162,448 votes.

Iowa changed party: in 1942 it went Republican, for George A. Wilson.

Democrats led in 81 of the 99 counties as they stood then and Republicans in 18. The largest, Polk, cast 77,817 votes and went to the Democrat by 36.6 points. The closest was Adams, where 14 votes separated the two parties.

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Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Guy M. Gillette won Democratic 578,226 57.8%
George A. Wilson Republican 415,778 41.6%
All other candidates 6,408 0.6%
Total1,000,412

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 52,859 67.9% 24,378 31.3% 580 77,817 D+36.6
Linn 23,884 56.4% 17,993 42.5% 489 42,366 D+13.9
Woodbury 24,254 64.3% 13,331 35.3% 140 37,725 D+29.0
Black Hawk 21,574 60.7% 13,741 38.7% 219 35,534 D+22.0
Scott 19,157 58.4% 13,402 40.8% 256 32,815 D+17.5
Dubuque 16,808 68.4% 7,664 31.2% 91 24,563 D+37.2
Pottawattamie 12,714 53.6% 10,897 46.0% 93 23,704 D+7.7
Wapello 11,545 62.7% 6,786 36.9% 81 18,412 D+25.8
Clinton 9,914 54.3% 8,266 45.3% 85 18,265 D+9.0
Cerro Gordo 10,650 61.0% 6,685 38.3% 122 17,457 D+22.7
Lee 9,861 58.9% 6,799 40.6% 86 16,746 D+18.3
Des Moines 9,586 58.7% 6,630 40.6% 127 16,343 D+18.1
Webster 10,403 64.9% 5,513 34.4% 113 16,029 D+30.5
Johnson 10,204 64.2% 5,488 34.5% 210 15,902 D+29.7
Story 8,005 56.7% 5,975 42.3% 135 14,115 D+14.4
Jasper 7,374 59.9% 4,856 39.4% 89 12,319 D+20.4
Marshall 6,573 54.8% 5,335 44.4% 95 12,003 D+10.3
Fayette 5,798 50.4% 5,644 49.0% 69 11,511 D+1.3
Muscatine 6,056 53.4% 5,205 45.9% 85 11,346 D+7.5
Marion 6,796 64.3% 3,664 34.7% 109 10,569 D+29.6
Dallas 6,184 58.9% 4,212 40.1% 111 10,507 D+18.8
Kossuth 6,335 63.4% 3,627 36.3% 27 9,989 D+27.1
Tama 5,516 56.1% 4,274 43.5% 41 9,831 D+12.6
Clayton 5,186 53.4% 4,486 46.2% 34 9,706 D+7.2
Boone 6,102 64.0% 3,319 34.8% 117 9,538 D+29.2
Sioux 4,656 49.4% 4,729 50.2% 32 9,417 R+0.8
Carroll 6,141 65.9% 3,146 33.8% 25 9,312 D+32.2
Winneshiek 5,067 54.4% 4,197 45.1% 43 9,307 D+9.3
Page 3,938 43.2% 5,090 55.8% 86 9,114 R+12.6
Appanoose 5,353 59.1% 3,612 39.9% 94 9,059 D+19.2
Plymouth 4,996 55.4% 4,004 44.4% 14 9,014 D+11.0
Harrison 4,539 53.0% 3,993 46.6% 32 8,564 D+6.4
Hardin 4,692 55.7% 3,669 43.6% 58 8,419 D+12.2
Mahaska 4,793 57.1% 3,447 41.1% 150 8,390 D+16.0
Buena Vista 5,447 65.0% 2,885 34.4% 52 8,384 D+30.6
Cass 3,838 46.5% 4,396 53.3% 18 8,252 R+6.8
Buchanan 4,383 53.2% 3,841 46.6% 19 8,243 D+6.6
Keokuk 4,482 54.4% 3,703 44.9% 54 8,239 D+9.5
Floyd 4,027 49.2% 4,101 50.1% 54 8,182 R+0.9
Poweshiek 4,785 59.0% 3,272 40.3% 53 8,110 D+18.7
Jones 4,288 53.1% 3,766 46.6% 24 8,078 D+6.5
Washington 3,824 47.9% 4,129 51.7% 34 7,987 R+3.8
Wright 4,559 58.4% 3,208 41.1% 34 7,801 D+17.3
Benton 4,711 61.0% 2,937 38.0% 80 7,728 D+23.0
Henry 3,403 44.4% 4,188 54.7% 70 7,661 R+10.2
Allamakee 3,255 43.8% 4,155 55.9% 18 7,428 R+12.1
Delaware 3,463 47.2% 3,847 52.5% 21 7,331 R+5.2
Warren 3,861 52.9% 3,376 46.3% 59 7,296 D+6.6
Union 3,478 47.9% 3,761 51.8% 20 7,259 R+3.9
Bremer 3,681 51.3% 3,480 48.5% 19 7,180 D+2.8
O'Brien 4,108 57.4% 2,998 41.9% 46 7,152 D+15.5
Chickasaw 4,014 56.6% 3,067 43.2% 14 7,095 D+13.3
Monona 4,225 59.8% 2,825 40.0% 17 7,067 D+19.8
Cherokee 4,893 69.3% 2,139 30.3% 25 7,057 D+39.0
Hamilton 4,089 58.1% 2,894 41.1% 56 7,039 D+17.0
Sac 4,186 59.5% 2,786 39.6% 58 7,030 D+19.9
Crawford 4,142 59.8% 2,731 39.5% 48 6,921 D+20.4
Jefferson 3,282 47.6% 3,520 51.1% 91 6,893 R+3.5
Cedar 3,298 48.0% 3,534 51.5% 34 6,866 R+3.4
Montgomery 3,024 44.7% 3,732 55.1% 12 6,768 R+10.5
Jackson 3,436 51.1% 3,257 48.5% 26 6,719 D+2.7
Shelby 3,879 57.8% 2,821 42.0% 16 6,716 D+15.8
Guthrie 3,608 54.5% 2,980 45.0% 31 6,619 D+9.5
Butler 3,192 48.5% 3,354 51.0% 34 6,580 R+2.5
Clay 4,241 64.5% 2,288 34.8% 45 6,574 D+29.7
Iowa 3,298 50.9% 3,129 48.3% 56 6,483 D+2.6
Palo Alto 4,044 64.2% 2,228 35.4% 28 6,300 D+28.8
Calhoun 3,465 57.8% 2,484 41.4% 50 5,999 D+16.4
Wayne 3,327 56.1% 2,573 43.4% 34 5,934 D+12.7
Howard 3,438 58.0% 2,451 41.4% 38 5,927 D+16.7
Madison 3,016 50.9% 2,885 48.7% 24 5,925 D+2.2
Hancock 3,384 57.6% 2,466 42.0% 28 5,878 D+15.6
Greene 3,317 57.3% 2,430 42.0% 43 5,790 D+15.3
Mitchell 2,944 51.5% 2,686 46.9% 92 5,722 D+4.5
Monroe 3,568 62.5% 2,103 36.8% 36 5,707 D+25.7
Pocahontas 3,673 65.4% 1,910 34.0% 33 5,616 D+31.4
Decatur 3,094 55.7% 2,438 43.9% 25 5,557 D+11.8
Franklin 3,130 57.7% 2,250 41.5% 47 5,427 D+16.2
Taylor 2,428 45.1% 2,936 54.6% 18 5,382 R+9.4
Grundy 2,857 53.1% 2,480 46.1% 40 5,377 D+7.0
Lucas 2,910 54.2% 2,386 44.5% 70 5,366 D+9.8
Adair 2,720 50.8% 2,614 48.8% 21 5,355 D+2.0
Humboldt 3,102 59.3% 2,115 40.4% 17 5,234 D+18.9
Fremont 2,748 52.9% 2,421 46.6% 23 5,192 D+6.3
Winnebago 2,743 52.9% 2,394 46.2% 44 5,181 D+6.7
Davis 3,151 61.3% 1,975 38.4% 13 5,139 D+22.9
Emmet 2,970 57.9% 2,127 41.4% 36 5,133 D+16.4
Audubon 3,001 60.7% 1,927 39.0% 15 4,943 D+21.7
Mills 2,219 45.5% 2,647 54.2% 16 4,882 R+8.8
Dickinson 2,895 60.7% 1,849 38.8% 24 4,768 D+21.9
Lyon 2,419 53.2% 2,114 46.5% 18 4,551 D+6.7
Ida 2,768 60.8% 1,751 38.5% 30 4,549 D+22.4
Van Buren 1,951 44.4% 2,418 55.0% 29 4,398 R+10.6
Worth 2,665 61.0% 1,665 38.1% 36 4,366 D+22.9
Louisa 2,086 48.1% 2,217 51.1% 34 4,337 R+3.0
Ringgold 1,964 46.2% 2,274 53.4% 17 4,255 R+7.3
Clarke 2,122 51.3% 1,994 48.2% 22 4,138 D+3.1
Adams 1,946 49.9% 1,932 49.6% 19 3,897 D+0.4
Osceola 2,248 60.1% 1,481 39.6% 12 3,741 D+20.5

Counties as they stood in 1948; some have since been split, merged or renamed. Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Iowa Senate elections we hold

YearWinnerMargin
2022 Chuck Grassley (R) R+12.2
2020 Joni Ernst (R) R+6.6
2016 Chuck Grassley (R) R+24.4
2014 Joni Ernst (R) R+8.3
2010 Chuck Grassley (R) R+31.0
2008 Tom Harkin (D) D+25.4
2004 Charles E. Grassley (R) R+42.3
2002 Tom Harkin (D) D+10.4
1998 Charles E. Grassley (R) R+37.9
1996 Tom Harkin (D) D+5.1
1992 Chuck Grassley (R) R+42.4
1990 Tom Harkin (D) D+9.1
1986 Charles E. Grassley (R) R+32.5
1984 Tom Harkin (D) D+11.8
1980 Charles E. Grassley (R) R+7.9
1978 Roger W. Jepsen (R) R+3.2
1974 John C. Culver (D) D+4.8
1972 Dick Clark (D) D+11.0
1968 Harold E. Hughes (D) D+0.6
1966 Jack Miller (R) R+23.1
1962 Bourke Hickenlooper (R) R+6.8
1960 Jack Miller (R) R+3.8
1956 Bourke Hickenlooper (R) R+7.8
1954 Thomas E. Martin (R) R+4.7
1950 Bourke Hickenlooper (R) R+10.1
1948 Guy M. Gillette (D) D+16.2
1944 Bourke Hickenlooper (R) R+2.9
1942 George A. Wilson (R) R+16.3
1938 Guy M. Gillette (D) D+0.3
1936 Clyde L. Herring (D) D+3.4
1932 Richard L. Murphy (D) D+13.9
1930 Lester Dickinson (R) R+13.3
1926 Smith W. Brookhart (R) R+13.2
1924 Smith W. Brookhart (R) R+0.1
1920 Albert B. Cummins (R) R+24.0
1918 William S. Kenyon (R) R+30.8
1914 Albert B. Cummins (R) R+9.0