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United States · Election results history · 2016 Senate · Iowa
Election 2016 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.

2016 US Senate election in Iowa

Chuck Grassley (Republican) beat Patty Judge (Democrat) in Iowa in 2016, 60.1% to 35.7%, a margin of 24.4 points and 376,547 votes.

The Republican hold continued from 2010, when Chuck Grassley also won.

Republicans led in 98 of the 99 counties and Democrats in 1. The largest, Polk, cast 228,391 votes and went to the Republican by 7.8 points. The closest was Jefferson, where 647 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
Chuck Grassley won Republican 926,007 60.1%
Patty Judge Democratic 549,460 35.7%
All other candidates 65,569 4.3%
Total1,541,036

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 100,317 43.9% 118,164 51.7% 9,910 228,391 R+7.8
Linn 47,635 41.2% 62,737 54.3% 5,242 115,614 R+13.1
Scott 34,503 40.7% 46,415 54.8% 3,774 84,692 R+14.1
Johnson 42,699 57.1% 28,914 38.6% 3,220 74,833 D+18.4
Black Hawk 27,245 42.9% 33,884 53.3% 2,398 63,527 R+10.5
Story 21,472 43.5% 25,475 51.7% 2,369 49,316 R+8.1
Dubuque 19,291 39.8% 27,348 56.4% 1,861 48,500 R+16.6
Woodbury 13,909 32.3% 27,166 63.2% 1,937 43,012 R+30.8
Pottawattamie 12,943 31.2% 25,721 62.0% 2,802 41,466 R+30.8
Dallas 11,876 31.4% 24,374 64.5% 1,525 37,775 R+33.1
Warren 8,700 32.4% 17,081 63.5% 1,098 26,879 R+31.2
Clinton 8,852 38.9% 12,821 56.3% 1,081 22,754 R+17.4
Cerro Gordo 8,173 36.1% 13,417 59.3% 1,043 22,633 R+23.2
Muscatine 6,963 36.5% 11,157 58.4% 975 19,095 R+22.0
Jasper 6,170 32.7% 11,688 62.0% 997 18,855 R+29.3
Des Moines 7,589 40.7% 10,353 55.5% 727 18,669 R+14.8
Sioux 1,709 9.5% 15,902 88.7% 321 17,932 R+79.1
Marshall 6,585 37.1% 10,432 58.8% 722 17,739 R+21.7
Marion 4,562 25.9% 12,407 70.4% 652 17,621 R+44.5
Webster 5,396 31.4% 11,045 64.4% 718 17,159 R+32.9
Lee 6,382 40.3% 8,441 53.3% 1,023 15,846 R+13.0
Wapello 5,365 36.3% 8,692 58.8% 733 14,790 R+22.5
Boone 4,820 34.3% 8,593 61.1% 643 14,056 R+26.8
Benton 3,811 27.8% 9,351 68.3% 523 13,685 R+40.5
Bremer 4,357 32.5% 8,583 64.0% 475 13,415 R+31.5
Plymouth 2,300 17.7% 10,338 79.7% 332 12,970 R+62.0
Winneshiek 4,436 39.5% 6,349 56.6% 434 11,219 R+17.1
Washington 3,062 28.4% 7,251 67.3% 464 10,777 R+38.9
Mahaska 2,302 22.0% 7,812 74.5% 368 10,482 R+52.6
Carroll 2,714 26.2% 7,259 70.2% 371 10,344 R+43.9
Dickinson 2,421 23.7% 7,489 73.2% 325 10,235 R+49.5
Buchanan 3,313 32.6% 6,382 62.9% 454 10,149 R+30.2
Jones 3,063 30.4% 6,551 65.0% 457 10,071 R+34.6
Jackson 3,450 34.3% 6,283 62.5% 324 10,057 R+28.2
Fayette 3,069 30.9% 6,412 64.5% 466 9,947 R+33.6
Poweshiek 3,748 38.5% 5,617 57.7% 366 9,731 R+19.2
Cedar 2,908 30.9% 6,103 64.9% 399 9,410 R+34.0
Henry 2,535 27.5% 6,294 68.2% 396 9,225 R+40.7
Delaware 2,369 25.8% 6,445 70.2% 366 9,180 R+44.4
Clayton 2,779 30.8% 5,851 64.9% 382 9,012 R+34.1
Iowa 2,443 27.7% 6,062 68.7% 319 8,824 R+41.0
Tama 2,769 31.7% 5,536 63.5% 417 8,722 R+31.7
Kossuth 2,247 26.2% 6,027 70.3% 300 8,574 R+44.1
Madison 2,205 25.9% 5,921 69.5% 394 8,520 R+43.6
Clay 1,894 22.4% 6,260 73.9% 318 8,472 R+51.5
Hardin 2,284 27.0% 5,841 69.0% 339 8,464 R+42.0
Buena Vista 2,382 29.6% 5,369 66.7% 299 8,050 R+37.1
Floyd 2,725 34.2% 4,947 62.0% 306 7,978 R+27.9
Jefferson 3,447 43.4% 4,094 51.6% 395 7,936 R+8.2
Hamilton 2,170 28.5% 5,142 67.5% 307 7,619 R+39.0
Butler 1,782 23.9% 5,433 72.8% 249 7,464 R+48.9
Mills 1,740 23.4% 5,290 71.3% 392 7,422 R+47.8
O'Brien 1,060 14.5% 6,076 83.2% 168 7,304 R+68.7
Harrison 1,788 24.5% 5,108 70.0% 402 7,298 R+45.5
Cass 1,558 22.5% 5,081 73.3% 290 6,929 R+50.8
Page 1,461 21.1% 5,208 75.2% 252 6,921 R+54.1
Grundy 1,370 19.9% 5,261 76.6% 237 6,868 R+56.7
Allamakee 2,099 30.7% 4,473 65.5% 255 6,827 R+34.8
Crawford 1,771 26.4% 4,674 69.5% 276 6,721 R+43.2
Chickasaw 1,956 30.6% 4,177 65.4% 249 6,382 R+34.8
Lyon 761 12.2% 5,328 85.2% 165 6,254 R+73.0
Cherokee 1,331 21.5% 4,670 75.4% 192 6,193 R+53.9
Shelby 1,409 23.1% 4,480 73.3% 221 6,110 R+50.3
Appanoose 1,690 28.1% 4,122 68.6% 201 6,013 R+40.4
Wright 1,550 25.9% 4,208 70.4% 223 5,981 R+44.4
Hancock 1,324 22.8% 4,232 72.7% 263 5,819 R+50.0
Union 1,625 28.1% 3,913 67.8% 237 5,775 R+39.6
Winnebago 1,590 27.6% 3,938 68.4% 233 5,761 R+40.8
Guthrie 1,413 24.7% 4,004 70.0% 307 5,724 R+45.3
Mitchell 1,536 28.6% 3,680 68.4% 163 5,379 R+39.9
Sac 1,015 19.8% 3,965 77.3% 151 5,131 R+57.5
Calhoun 1,154 22.5% 3,798 74.2% 166 5,118 R+51.7
Humboldt 999 19.8% 3,860 76.6% 180 5,039 R+56.8
Montgomery 1,067 21.6% 3,646 73.7% 236 4,949 R+52.1
Franklin 1,172 23.7% 3,550 71.9% 218 4,940 R+48.1
Louisa 1,429 28.9% 3,303 66.9% 207 4,939 R+37.9
Keokuk 1,045 21.3% 3,697 75.2% 173 4,915 R+54.0
Greene 1,344 28.3% 3,197 67.4% 202 4,743 R+39.1
Emmet 1,171 24.9% 3,341 70.9% 199 4,711 R+46.1
Palo Alto 1,109 23.8% 3,377 72.6% 167 4,653 R+48.7
Monona 1,049 23.2% 3,315 73.2% 166 4,530 R+50.0
Howard 1,459 32.4% 2,859 63.4% 192 4,510 R+31.0
Clarke 1,273 29.0% 2,903 66.2% 209 4,385 R+37.2
Lucas 1,068 25.0% 3,064 71.6% 145 4,277 R+46.7
Worth 1,246 29.5% 2,774 65.7% 202 4,222 R+36.2
Davis 972 25.3% 2,750 71.6% 121 3,843 R+46.3
Monroe 1,280 33.4% 2,458 64.1% 99 3,837 R+30.7
Pocahontas 784 20.5% 2,891 75.6% 149 3,824 R+55.1
Adair 894 23.7% 2,708 71.8% 170 3,772 R+48.1
Decatur 1,037 28.2% 2,488 67.6% 156 3,681 R+39.4
Ida 590 16.5% 2,868 80.3% 113 3,571 R+63.8
Van Buren 764 21.6% 2,618 74.1% 149 3,531 R+52.5
Fremont 735 21.0% 2,582 73.7% 188 3,505 R+52.7
Audubon 847 25.8% 2,323 70.8% 112 3,282 R+45.0
Osceola 455 14.5% 2,601 82.8% 87 3,143 R+68.3
Taylor 613 20.8% 2,220 75.5% 108 2,941 R+54.6
Wayne 645 22.0% 2,195 74.9% 89 2,929 R+52.9
Ringgold 617 23.0% 1,989 74.1% 80 2,686 R+51.1
Adams 454 22.0% 1,515 73.5% 93 2,062 R+51.5

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