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United States · Election results history · 1980 Senate · Iowa
Election 1980 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.

1980 US Senate election in Iowa

Charles E. Grassley (Republican) beat John Culver (Democrat) in Iowa in 1980, 53.5% to 45.5%, a margin of 7.9 points and 101,469 votes.

Iowa changed party: in 1974 it went Democratic, for John C. Culver.

Republicans led in 86 of the 99 counties as they stood then and Democrats in 13. The largest, Polk, cast 139,914 votes and went to the Democrat by 13.1 points. The closest was Monroe, where 71 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
Charles E. Grassley won Republican 683,014 53.5%
John Culver Democratic 581,545 45.5%
All other candidates 12,427 1.0%
Total1,276,986

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 78,300 56.0% 59,965 42.9% 1,649 139,914 D+13.1
Linn 40,460 52.5% 35,829 46.5% 809 77,098 D+6.0
Scott 32,228 48.2% 33,653 50.4% 928 66,809 R+2.1
Black Hawk 28,415 45.3% 33,918 54.0% 462 62,795 R+8.8
Johnson 28,412 67.4% 13,311 31.6% 412 42,135 D+35.8
Woodbury 18,484 45.0% 22,093 53.8% 488 41,065 R+8.8
Dubuque 20,877 51.8% 19,172 47.5% 272 40,321 D+4.2
Story 20,191 55.4% 15,848 43.5% 388 36,427 D+11.9
Pottawattamie 12,150 38.7% 18,921 60.3% 329 31,400 R+21.6
Clinton 11,422 46.8% 12,796 52.4% 212 24,430 R+5.6
Cerro Gordo 9,677 43.5% 12,444 55.9% 131 22,252 R+12.4
Webster 10,128 50.3% 9,673 48.1% 328 20,129 D+2.3
Des Moines 10,251 52.0% 9,286 47.1% 184 19,721 D+4.9
Marshall 7,492 39.0% 11,560 60.1% 182 19,234 R+21.2
Lee 8,990 51.4% 8,297 47.4% 211 17,498 D+4.0
Wapello 9,530 55.9% 7,242 42.4% 291 17,063 D+13.4
Jasper 7,902 47.7% 8,496 51.2% 183 16,581 R+3.6
Warren 7,834 51.6% 7,200 47.4% 146 15,180 D+4.2
Muscatine 6,290 43.1% 8,110 55.5% 203 14,603 R+12.5
Sioux 2,794 20.6% 10,691 78.8% 76 13,561 R+58.2
Marion 6,106 46.9% 6,764 51.9% 159 13,029 R+5.1
Dallas 6,522 51.4% 6,084 47.9% 95 12,701 D+3.4
Boone 5,832 50.2% 5,647 48.6% 130 11,609 D+1.6
Fayette 4,642 40.7% 6,702 58.7% 70 11,414 R+18.0
Bremer 3,301 29.6% 7,822 70.0% 47 11,170 R+40.5
Benton 4,374 41.8% 5,977 57.1% 117 10,468 R+15.3
Mahaska 4,259 42.3% 5,696 56.6% 113 10,068 R+14.3
Kossuth 3,784 38.9% 5,848 60.2% 85 9,717 R+21.2
Plymouth 3,243 33.4% 6,358 65.4% 114 9,715 R+32.1
Hardin 3,626 38.0% 5,822 61.1% 88 9,536 R+23.0
Buena Vista 4,031 43.3% 5,158 55.4% 122 9,311 R+12.1
Carroll 4,029 43.7% 5,059 54.8% 139 9,227 R+11.2
Buchanan 3,682 40.7% 5,340 59.0% 27 9,049 R+18.3
Clayton 3,834 42.5% 5,132 56.9% 54 9,020 R+14.4
Winneshiek 3,420 38.1% 5,478 61.0% 78 8,976 R+22.9
Floyd 3,590 40.3% 5,246 58.9% 66 8,902 R+18.6
Poweshiek 4,213 47.3% 4,615 51.9% 70 8,898 R+4.5
Tama 3,182 35.8% 5,637 63.4% 78 8,897 R+27.6
Jones 3,899 44.6% 4,784 54.7% 62 8,745 R+10.1
Jackson 3,806 45.2% 4,515 53.6% 105 8,426 R+8.4
Clay 3,697 44.7% 4,481 54.2% 91 8,269 R+9.5
Henry 3,515 43.1% 4,598 56.4% 34 8,147 R+13.3
Hamilton 2,814 34.7% 5,218 64.4% 74 8,106 R+29.7
Cass 2,312 30.4% 5,242 68.9% 54 7,608 R+38.5
Delaware 2,905 38.3% 4,613 60.8% 63 7,581 R+22.5
Cedar 2,941 38.8% 4,561 60.2% 73 7,575 R+21.4
Crawford 2,490 33.4% 4,901 65.7% 69 7,460 R+32.3
Page 1,947 26.3% 5,423 73.2% 39 7,409 R+46.9
Washington 3,120 42.3% 4,192 56.8% 72 7,384 R+14.5
Iowa 2,775 37.9% 4,476 61.2% 68 7,319 R+23.2
O'Brien 2,443 33.5% 4,794 65.7% 65 7,302 R+32.2
Chickasaw 2,580 35.4% 4,692 64.4% 17 7,289 R+29.0
Cherokee 3,003 41.7% 4,131 57.4% 59 7,193 R+15.7
Butler 1,676 23.5% 5,422 76.1% 25 7,123 R+52.6
Wright 2,551 36.3% 4,426 63.1% 42 7,019 R+26.7
Jefferson 2,743 39.1% 4,200 59.8% 75 7,018 R+20.8
Dickinson 2,997 43.1% 3,864 55.6% 90 6,951 R+12.5
Grundy 1,592 23.0% 5,309 76.6% 29 6,930 R+53.6
Harrison 2,255 33.4% 4,478 66.3% 17 6,750 R+32.9
Appanoose 2,811 43.4% 3,550 54.8% 116 6,477 R+11.4
Allamakee 2,109 33.0% 4,254 66.5% 35 6,398 R+33.5
Winnebago 2,311 36.9% 3,941 62.9% 12 6,264 R+26.0
Shelby 1,940 31.3% 4,220 68.0% 43 6,203 R+36.8
Calhoun 2,359 38.2% 3,716 60.2% 99 6,174 R+22.0
Madison 2,838 47.2% 3,140 52.3% 31 6,009 R+5.0
Hancock 1,879 31.5% 4,044 67.9% 34 5,957 R+36.3
Sac 2,145 36.6% 3,627 61.9% 85 5,857 R+25.3
Lyon 1,487 25.5% 4,303 73.7% 45 5,835 R+48.3
Keokuk 2,378 41.0% 3,324 57.3% 94 5,796 R+16.3
Mitchell 1,816 31.5% 3,903 67.7% 46 5,765 R+36.2
Humboldt 2,198 38.4% 3,469 60.5% 64 5,731 R+22.2
Union 2,389 42.0% 3,237 57.0% 56 5,682 R+14.9
Greene 2,535 44.7% 3,070 54.1% 67 5,672 R+9.4
Montgomery 1,510 26.7% 4,087 72.3% 53 5,650 R+45.6
Franklin 1,654 29.6% 3,888 69.7% 37 5,579 R+40.0
Palo Alto 2,650 47.8% 2,814 50.7% 83 5,547 R+3.0
Howard 1,778 32.2% 3,742 67.7% 5 5,525 R+35.5
Pocahontas 2,313 42.0% 3,090 56.2% 98 5,501 R+14.1
Emmet 2,431 45.3% 2,863 53.3% 76 5,370 R+8.0
Guthrie 2,228 41.7% 3,070 57.5% 39 5,337 R+15.8
Monona 1,801 36.5% 3,098 62.7% 39 4,938 R+26.3
Mills 1,295 26.6% 3,533 72.5% 46 4,874 R+45.9
Lucas 2,089 43.6% 2,668 55.7% 31 4,788 R+12.1
Adair 1,742 38.2% 2,786 61.1% 31 4,559 R+22.9
Decatur 2,179 48.5% 2,287 50.9% 29 4,495 R+2.4
Louisa 1,769 39.4% 2,697 60.0% 27 4,493 R+20.7
Clarke 1,913 44.8% 2,329 54.6% 24 4,266 R+9.8
Worth 1,723 40.9% 2,472 58.7% 16 4,211 R+17.8
Ida 1,365 32.8% 2,765 66.5% 26 4,156 R+33.7
Audubon 1,623 39.1% 2,500 60.3% 26 4,149 R+21.1
Monroe 2,013 50.6% 1,942 48.8% 25 3,980 D+1.8
Taylor 1,283 32.8% 2,620 66.9% 11 3,914 R+34.2
Fremont 1,224 31.6% 2,611 67.4% 38 3,873 R+35.8
Wayne 1,604 41.7% 2,216 57.6% 29 3,849 R+15.9
Davis 1,784 46.4% 2,035 52.9% 26 3,845 R+6.5
Van Buren 1,364 38.3% 2,183 61.3% 12 3,559 R+23.0
Osceola 1,217 37.0% 2,034 61.8% 38 3,289 R+24.8
Ringgold 1,217 38.6% 1,921 61.0% 13 3,151 R+22.3
Adams 1,023 36.7% 1,755 62.9% 11 2,789 R+26.2

Counties as they stood in 1980; 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