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United States · Election results history · 1984 Senate · Iowa
Election 1984 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.

1984 US Senate election in Iowa

Tom Harkin (Democrat) beat Roger W. Jepsen (Republican) in Iowa in 1984, 55.5% to 43.7%, a margin of 11.8 points and 152,502 votes.

Iowa changed party: in 1978 it went Republican, for Roger W. Jepsen.

Democrats led in 73 of the 99 counties as they stood then and Republicans in 26. The largest, Polk, cast 145,193 votes and went to the Democrat by 23.0 points. The closest was Delaware, where 5 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
Tom Harkin won Democratic 716,883 55.5%
Roger W. Jepsen Republican 564,381 43.7%
All other candidates 11,436 0.9%
Total1,292,700

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 88,793 61.2% 55,329 38.1% 1,071 145,193 D+23.0
Linn 43,720 54.2% 35,447 44.0% 1,451 80,618 D+10.3
Scott 37,922 54.4% 31,381 45.0% 456 69,759 D+9.4
Black Hawk 35,210 56.0% 27,319 43.4% 383 62,912 D+12.5
Johnson 30,549 67.9% 13,576 30.2% 852 44,977 D+37.7
Woodbury 23,016 56.3% 17,632 43.1% 234 40,882 D+13.2
Dubuque 23,615 59.1% 16,064 40.2% 274 39,953 D+18.9
Story 22,615 59.8% 14,913 39.5% 264 37,792 D+20.4
Pottawattamie 16,161 48.4% 16,975 50.8% 256 33,392 R+2.4
Clinton 13,352 53.6% 11,420 45.9% 132 24,904 D+7.8
Cerro Gordo 12,330 55.0% 9,909 44.2% 159 22,398 D+10.8
Des Moines 12,255 60.0% 8,058 39.4% 125 20,438 D+20.5
Marshall 10,568 54.5% 8,603 44.3% 228 19,399 D+10.1
Webster 11,850 61.9% 7,100 37.1% 206 19,156 D+24.8
Lee 10,038 57.4% 7,331 41.9% 108 17,477 D+15.5
Wapello 11,628 66.7% 5,669 32.5% 142 17,439 D+34.2
Jasper 9,264 56.2% 7,083 43.0% 124 16,471 D+13.2
Warren 10,331 63.3% 5,871 36.0% 129 16,331 D+27.3
Muscatine 7,302 48.9% 7,509 50.3% 110 14,921 R+1.4
Sioux 3,540 26.0% 10,065 73.8% 30 13,635 R+47.9
Marion 7,475 56.1% 5,755 43.2% 95 13,325 D+12.9
Dallas 8,115 63.0% 4,558 35.4% 217 12,890 D+27.6
Boone 7,917 64.9% 4,239 34.7% 47 12,203 D+30.1
Fayette 5,604 50.8% 5,326 48.3% 99 11,029 D+2.5
Bremer 4,956 46.5% 5,603 52.6% 98 10,657 R+6.1
Benton 5,603 54.0% 4,595 44.3% 175 10,373 D+9.7
Mahaska 4,993 49.2% 5,006 49.3% 158 10,157 R+0.1
Carroll 6,199 63.2% 3,533 36.0% 79 9,811 D+27.2
Plymouth 4,667 48.4% 4,905 50.9% 71 9,643 R+2.5
Hardin 5,290 55.1% 4,220 44.0% 83 9,593 D+11.2
Kossuth 5,363 56.6% 4,025 42.5% 90 9,478 D+14.1
Buchanan 4,910 52.9% 4,187 45.1% 184 9,281 D+7.8
Buena Vista 4,999 55.3% 3,960 43.8% 83 9,042 D+11.5
Jackson 4,971 55.4% 3,898 43.5% 99 8,968 D+12.0
Winneshiek 4,541 51.1% 4,244 47.8% 102 8,887 D+3.3
Tama 4,838 55.3% 3,885 44.4% 31 8,754 D+10.9
Poweshiek 4,955 56.9% 3,654 41.9% 106 8,715 D+14.9
Jones 4,390 51.1% 4,154 48.3% 54 8,598 D+2.7
Floyd 4,422 52.3% 3,987 47.2% 42 8,451 D+5.1
Clayton 3,943 47.4% 4,294 51.7% 76 8,313 R+4.2
Clay 4,668 58.1% 3,287 40.9% 83 8,038 D+17.2
Delaware 3,850 49.5% 3,855 49.5% 79 7,784 R+0.1
Crawford 4,429 56.9% 3,221 41.4% 127 7,777 D+15.5
Cedar 3,714 48.2% 3,817 49.6% 170 7,701 R+1.3
Henry 3,924 51.0% 3,740 48.6% 24 7,688 D+2.4
Hamilton 4,190 54.8% 3,385 44.3% 73 7,648 D+10.5
Washington 3,803 50.0% 3,741 49.2% 63 7,607 D+0.8
Page 2,831 37.4% 4,707 62.1% 37 7,575 R+24.8
O'Brien 3,304 45.2% 3,962 54.2% 39 7,305 R+9.0
Cass 3,253 44.7% 3,969 54.5% 59 7,281 R+9.8
Jefferson 3,726 51.3% 3,515 48.4% 22 7,263 D+2.9
Cherokee 4,137 57.4% 2,984 41.4% 83 7,204 D+16.0
Iowa 3,317 46.7% 3,669 51.6% 124 7,110 R+5.0
Dickinson 3,661 52.8% 3,196 46.1% 82 6,939 D+6.7
Butler 2,740 40.3% 4,019 59.1% 36 6,795 R+18.8
Harrison 3,553 52.7% 3,170 47.1% 13 6,736 D+5.7
Chickasaw 3,692 54.9% 2,993 44.5% 38 6,723 D+10.4
Wright 3,565 53.9% 2,990 45.2% 59 6,614 D+8.7
Appanoose 3,651 55.4% 2,884 43.8% 57 6,592 D+11.6
Shelby 3,198 49.5% 3,240 50.1% 26 6,464 R+0.6
Union 3,722 58.2% 2,635 41.2% 37 6,394 D+17.0
Grundy 2,366 37.1% 3,942 61.8% 73 6,381 R+24.7
Madison 3,889 63.1% 2,253 36.6% 19 6,161 D+26.6
Allamakee 2,460 40.1% 3,611 58.9% 59 6,130 R+18.8
Winnebago 2,782 45.7% 3,285 54.0% 17 6,084 R+8.3
Hancock 2,736 47.2% 3,019 52.1% 39 5,794 R+4.9
Calhoun 3,196 55.3% 2,545 44.0% 41 5,782 D+11.3
Greene 3,673 63.8% 2,020 35.1% 60 5,753 D+28.7
Montgomery 2,316 40.6% 3,350 58.7% 41 5,707 R+18.1
Humboldt 2,968 52.2% 2,631 46.3% 86 5,685 D+5.9
Mitchell 2,640 47.1% 2,929 52.2% 41 5,610 R+5.2
Sac 3,066 54.8% 2,480 44.4% 45 5,591 D+10.5
Palo Alto 3,343 60.1% 2,155 38.7% 67 5,565 D+21.3
Keokuk 3,092 55.8% 2,334 42.1% 117 5,543 D+13.7
Emmet 2,923 53.4% 2,515 46.0% 32 5,470 D+7.5
Lyon 1,634 30.0% 3,784 69.4% 31 5,449 R+39.5
Franklin 2,765 51.3% 2,569 47.7% 57 5,391 D+3.6
Guthrie 3,240 61.1% 2,006 37.8% 56 5,302 D+23.3
Mills 2,066 39.3% 3,162 60.1% 34 5,262 R+20.8
Pocahontas 3,022 59.8% 1,967 38.9% 64 5,053 D+20.9
Howard 2,479 49.1% 2,504 49.6% 65 5,048 R+0.5
Lucas 2,858 58.0% 2,039 41.4% 29 4,926 D+16.6
Monona 2,709 56.4% 2,057 42.8% 39 4,805 D+13.6
Adair 2,745 60.4% 1,777 39.1% 23 4,545 D+21.3
Louisa 2,266 50.6% 2,204 49.2% 10 4,480 D+1.4
Clarke 2,669 62.6% 1,584 37.2% 10 4,263 D+25.5
Decatur 2,697 64.5% 1,473 35.2% 14 4,184 D+29.3
Monroe 2,636 63.4% 1,509 36.3% 15 4,160 D+27.1
Worth 2,261 54.5% 1,881 45.3% 8 4,150 D+9.2
Audubon 2,411 58.9% 1,660 40.5% 24 4,095 D+18.3
Ida 2,085 51.4% 1,942 47.9% 30 4,057 D+3.5
Davis 2,394 59.3% 1,622 40.2% 23 4,039 D+19.1
Fremont 1,906 47.4% 2,090 52.0% 24 4,020 R+4.6
Taylor 2,104 53.4% 1,812 46.0% 26 3,942 D+7.4
Wayne 2,486 63.6% 1,410 36.1% 14 3,910 D+27.5
Van Buren 1,882 51.2% 1,786 48.6% 9 3,677 D+2.6
Osceola 1,412 43.2% 1,837 56.2% 20 3,269 R+13.0
Ringgold 1,991 64.4% 1,093 35.4% 7 3,091 D+29.1
Adams 1,577 54.9% 1,283 44.7% 13 2,873 D+10.2

Counties as they stood in 1984; 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