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United States · Election results history · 2020 Senate · Iowa
Election 2020 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.

2020 US Senate election in Iowa

Joni Ernst (Republican) beat Theresa Greenfield (Democrat) in Iowa in 2020, 51.7% to 45.2%, a margin of 6.6 points and 110,138 votes.

The Republican hold continued from 2014, when Joni Ernst also won.

Republicans led in 91 of the 99 counties and Democrats in 8. The largest, Polk, cast 256,257 votes and went to the Democrat by 14.0 points. The closest was Des Moines, where 172 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
Joni Ernst won Republican 864,997 51.7%
Theresa Greenfield Democratic 754,859 45.2%
All other candidates 51,972 3.1%
Total1,671,828

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 142,328 55.5% 106,443 41.5% 7,486 256,257 D+14.0
Linn 69,125 54.7% 53,248 42.1% 4,093 126,466 D+12.6
Scott 45,751 49.9% 42,941 46.9% 2,914 91,606 D+3.1
Johnson 57,063 69.1% 23,773 28.8% 1,797 82,633 D+40.3
Black Hawk 34,963 53.0% 29,222 44.3% 1,828 66,013 D+8.7
Dallas 25,427 45.8% 28,727 51.7% 1,420 55,574 R+5.9
Dubuque 25,433 47.9% 26,034 49.0% 1,613 53,080 R+1.1
Story 28,216 55.9% 20,750 41.1% 1,547 50,513 D+14.8
Pottawattamie 18,520 41.1% 24,720 54.9% 1,825 45,065 R+13.8
Woodbury 18,674 41.9% 24,175 54.3% 1,695 44,544 R+12.3
Warren 12,478 40.6% 17,276 56.3% 949 30,703 R+15.6
Clinton 10,942 44.9% 12,559 51.6% 850 24,351 R+6.6
Cerro Gordo 11,534 49.0% 11,339 48.2% 657 23,530 D+0.8
Muscatine 9,381 45.9% 10,278 50.3% 782 20,441 R+4.4
Jasper 7,905 39.5% 11,405 57.0% 716 20,026 R+17.5
Des Moines 9,296 47.4% 9,468 48.3% 852 19,616 R+0.9
Marion 6,269 32.9% 12,211 64.1% 582 19,062 R+31.2
Sioux 2,828 15.0% 15,785 83.5% 282 18,895 R+68.6
Marshall 8,187 45.8% 9,057 50.7% 628 17,872 R+4.9
Webster 6,845 38.8% 10,195 57.8% 595 17,635 R+19.0
Lee 7,445 45.0% 8,489 51.3% 618 16,552 R+6.3
Wapello 6,344 41.3% 8,464 55.1% 540 15,348 R+13.8
Boone 6,316 41.6% 8,315 54.7% 559 15,190 R+13.2
Benton 5,202 35.9% 8,830 60.9% 460 14,492 R+25.0
Bremer 5,911 40.9% 8,196 56.7% 343 14,450 R+15.8
Plymouth 3,587 25.6% 10,145 72.3% 307 14,039 R+46.7
Winneshiek 5,581 46.7% 6,039 50.5% 340 11,960 R+3.8
Washington 4,519 38.8% 6,773 58.1% 362 11,654 R+19.3
Mahaska 2,969 26.4% 7,860 70.0% 399 11,228 R+43.6
Dickinson 3,791 33.9% 7,149 63.9% 244 11,184 R+30.0
Carroll 3,580 32.1% 7,245 64.9% 337 11,162 R+32.8
Jackson 4,249 38.9% 6,175 56.6% 489 10,913 R+17.6
Jones 4,237 38.9% 6,320 58.0% 345 10,902 R+19.1
Buchanan 4,292 40.1% 6,063 56.6% 349 10,704 R+16.5
Cedar 4,300 40.8% 5,935 56.3% 306 10,541 R+15.5
Fayette 3,912 38.7% 5,865 58.1% 325 10,102 R+19.3
Poweshiek 4,381 43.6% 5,361 53.4% 301 10,043 R+9.8
Delaware 3,235 32.6% 6,454 65.0% 247 9,936 R+32.4
Henry 3,457 35.4% 5,875 60.1% 440 9,772 R+24.7
Madison 3,168 32.6% 6,245 64.2% 307 9,720 R+31.7
Iowa 3,541 36.8% 5,794 60.1% 300 9,635 R+23.4
Clayton 3,434 36.1% 5,845 61.4% 245 9,524 R+25.3
Kossuth 2,799 31.1% 5,957 66.1% 250 9,006 R+35.1
Tama 3,588 40.0% 5,090 56.7% 292 8,970 R+16.7
Clay 2,861 32.3% 5,716 64.5% 291 8,868 R+32.2
Hardin 2,920 33.0% 5,639 63.8% 280 8,839 R+30.8
Jefferson 4,547 51.6% 4,008 45.5% 253 8,808 D+6.1
Mills 2,544 31.2% 5,347 65.5% 267 8,158 R+34.4
Harrison 2,574 32.1% 5,059 63.1% 385 8,018 R+31.0
Butler 2,474 30.9% 5,291 66.1% 244 8,009 R+35.2
Buena Vista 3,022 37.8% 4,724 59.1% 248 7,994 R+21.3
Floyd 3,498 43.9% 4,181 52.4% 293 7,972 R+8.6
Hamilton 2,913 37.0% 4,679 59.4% 283 7,875 R+22.4
O'Brien 1,640 22.0% 5,675 76.1% 147 7,462 R+54.1
Page 2,067 27.8% 5,152 69.3% 219 7,438 R+41.5
Allamakee 2,602 35.5% 4,478 61.0% 256 7,336 R+25.6
Grundy 2,120 29.4% 4,900 67.9% 197 7,217 R+38.5
Cass 2,259 31.5% 4,725 65.9% 181 7,165 R+34.4
Crawford 2,336 33.3% 4,424 63.1% 249 7,009 R+29.8
Lyon 1,073 15.9% 5,522 81.8% 156 6,751 R+65.9
Shelby 1,989 29.7% 4,489 67.1% 216 6,694 R+37.3
Chickasaw 2,324 35.3% 4,024 61.2% 232 6,580 R+25.8
Cherokee 2,002 31.2% 4,214 65.6% 209 6,425 R+34.4
Appanoose 1,956 30.6% 4,189 65.6% 241 6,386 R+35.0
Guthrie 2,000 31.6% 4,103 64.9% 223 6,326 R+33.2
Wright 2,063 33.3% 3,889 62.8% 236 6,188 R+29.5
Union 2,051 33.5% 3,820 62.4% 253 6,124 R+28.9
Hancock 1,881 30.9% 4,004 65.9% 195 6,080 R+34.9
Winnebago 2,361 39.8% 3,336 56.3% 229 5,926 R+16.5
Mitchell 2,282 39.3% 3,347 57.7% 173 5,802 R+18.4
Sac 1,440 26.3% 3,849 70.2% 196 5,485 R+43.9
Montgomery 1,520 28.7% 3,633 68.5% 148 5,301 R+39.9
Humboldt 1,443 27.4% 3,671 69.7% 150 5,264 R+42.3
Louisa 1,804 34.3% 3,259 62.0% 196 5,259 R+27.7
Keokuk 1,489 28.6% 3,565 68.4% 159 5,213 R+39.8
Calhoun 1,531 29.4% 3,513 67.4% 168 5,212 R+38.0
Franklin 1,639 32.4% 3,270 64.5% 157 5,066 R+32.2
Greene 1,784 35.7% 3,063 61.4% 145 4,992 R+25.6
Palo Alto 1,677 34.0% 3,113 63.1% 142 4,932 R+29.1
Howard 2,014 41.1% 2,716 55.4% 176 4,906 R+14.3
Emmet 1,637 34.1% 2,965 61.8% 195 4,797 R+27.7
Monona 1,455 31.2% 3,054 65.5% 156 4,665 R+34.3
Clarke 1,520 33.0% 2,906 63.1% 183 4,609 R+30.1
Lucas 1,302 28.6% 3,105 68.3% 138 4,545 R+39.7
Worth 1,803 41.2% 2,425 55.4% 149 4,377 R+14.2
Adair 1,207 29.1% 2,809 67.8% 128 4,144 R+38.7
Davis 1,167 28.9% 2,728 67.5% 146 4,041 R+38.6
Monroe 1,148 28.6% 2,742 68.4% 119 4,009 R+39.8
Ida 964 25.3% 2,757 72.2% 96 3,817 R+47.0
Fremont 1,099 28.9% 2,563 67.3% 146 3,808 R+38.4
Pocahontas 1,003 26.5% 2,641 69.9% 136 3,780 R+43.3
Van Buren 1,065 28.4% 2,583 68.8% 104 3,752 R+40.5
Decatur 1,165 31.1% 2,439 65.2% 136 3,740 R+34.1
Audubon 1,092 32.4% 2,188 64.9% 92 3,372 R+32.5
Osceola 657 20.1% 2,525 77.4% 81 3,263 R+57.2
Taylor 762 23.7% 2,337 72.8% 111 3,210 R+49.1
Wayne 784 25.7% 2,186 71.6% 85 3,055 R+45.9
Ringgold 732 27.2% 1,870 69.4% 94 2,696 R+42.2
Adams 594 27.5% 1,497 69.3% 68 2,159 R+41.8

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