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United States · Election results history · 1966 Senate · Iowa
Election 1966 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.

1966 US Senate election in Iowa

Jack Miller (Republican) beat E.B. Smith (Democrat) in Iowa in 1966, 60.9% to 37.8%, a margin of 23.1 points and 198,225 votes.

The Republican hold continued from 1960, when Jack Miller also won.

Republicans led in 99 of the 99 counties as they stood then. The largest, Polk, cast 81,793 votes and went to the Republican by 6.7 points. The closest was Davis, where 423 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
Jack Miller won Republican 522,339 60.9%
E.B. Smith Democratic 324,114 37.8%
All other candidates 11,043 1.3%
Total857,496

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 37,052 45.3% 42,573 52.0% 2,168 81,793 R+6.7
Linn 19,286 43.1% 24,970 55.8% 518 44,774 R+12.7
Black Hawk 13,951 37.8% 22,658 61.3% 329 36,938 R+23.6
Scott 13,713 37.9% 21,949 60.6% 567 36,229 R+22.7
Woodbury 12,634 39.0% 19,454 60.0% 318 32,406 R+21.0
Dubuque 9,622 44.6% 11,384 52.8% 561 21,567 R+8.2
Pottawattamie 6,147 31.5% 13,271 68.0% 89 19,507 R+36.5
Story 5,781 36.1% 9,802 61.3% 418 16,001 R+25.1
Clinton 5,900 37.5% 9,732 61.8% 113 15,745 R+24.3
Johnson 6,836 43.6% 8,290 52.8% 564 15,690 R+9.3
Des Moines 6,399 42.8% 8,394 56.2% 146 14,939 R+13.4
Cerro Gordo 5,896 39.8% 8,697 58.7% 213 14,806 R+18.9
Wapello 6,684 46.3% 7,501 52.0% 237 14,422 R+5.7
Webster 6,216 45.0% 7,449 53.9% 150 13,815 R+8.9
Lee 5,207 38.7% 8,204 60.9% 56 13,467 R+22.3
Jasper 5,179 43.0% 6,740 56.0% 122 12,041 R+13.0
Marshall 4,152 34.8% 7,581 63.6% 186 11,919 R+28.8
Sioux 1,972 19.6% 8,074 80.2% 23 10,069 R+60.6
Fayette 3,260 34.5% 6,164 65.1% 38 9,462 R+30.7
Muscatine 3,113 33.9% 6,004 65.3% 71 9,188 R+31.5
Marion 3,706 41.2% 5,236 58.1% 64 9,006 R+17.0
Carroll 3,743 45.6% 4,446 54.1% 25 8,214 R+8.6
Dallas 3,547 43.9% 4,411 54.6% 121 8,079 R+10.7
Kossuth 3,307 41.3% 4,643 57.9% 65 8,015 R+16.7
Boone 3,504 44.0% 4,305 54.1% 151 7,960 R+10.1
Warren 3,069 39.3% 4,578 58.6% 159 7,806 R+19.3
Plymouth 2,116 27.2% 5,607 72.2% 43 7,766 R+45.0
Winneshiek 2,779 37.0% 4,677 62.2% 63 7,519 R+25.2
Mahaska 2,812 37.5% 4,547 60.6% 139 7,498 R+23.1
Benton 2,711 39.7% 4,051 59.3% 70 6,832 R+19.6
Page 1,787 26.2% 5,011 73.4% 25 6,823 R+47.3
O'Brien 1,815 27.0% 4,836 71.8% 81 6,732 R+44.9
Floyd 2,313 34.7% 4,303 64.5% 58 6,674 R+29.8
Hardin 2,120 31.9% 4,293 64.5% 238 6,651 R+32.7
Clayton 2,397 36.3% 4,177 63.3% 28 6,602 R+27.0
Buchanan 2,313 35.1% 4,249 64.5% 21 6,583 R+29.4
Buena Vista 2,242 34.1% 4,238 64.5% 90 6,570 R+30.4
Tama 2,660 40.9% 3,785 58.2% 53 6,498 R+17.3
Jones 2,399 37.5% 3,954 61.9% 37 6,390 R+24.3
Appanoose 2,435 39.6% 3,670 59.7% 38 6,143 R+20.1
Poweshiek 2,287 37.2% 3,748 61.0% 107 6,142 R+23.8
Bremer 1,711 28.1% 4,334 71.1% 52 6,097 R+43.0
Washington 2,053 34.2% 3,879 64.7% 65 5,997 R+30.4
Delaware 1,980 33.2% 3,979 66.6% 13 5,972 R+33.5
Cherokee 1,716 29.5% 4,037 69.4% 62 5,815 R+39.9
Chickasaw 2,267 39.1% 3,529 60.8% 5 5,801 R+21.8
Jackson 2,039 35.3% 3,686 63.8% 52 5,777 R+28.5
Harrison 2,013 35.6% 3,645 64.4% 4 5,662 R+28.8
Cedar 1,867 33.3% 3,701 65.9% 44 5,612 R+32.7
Clay 1,655 30.0% 3,658 66.2% 209 5,522 R+36.3
Wright 2,123 38.6% 3,299 59.9% 82 5,504 R+21.4
Henry 1,609 29.3% 3,823 69.7% 55 5,487 R+40.3
Cass 1,360 25.2% 3,993 73.9% 47 5,400 R+48.8
Hamilton 1,872 34.9% 3,423 63.7% 76 5,371 R+28.9
Crawford 1,916 35.7% 3,384 63.1% 66 5,366 R+27.4
Keokuk 2,143 40.0% 3,146 58.7% 69 5,358 R+18.7
Iowa 1,815 34.7% 3,271 62.6% 142 5,228 R+27.9
Allamakee 1,696 32.5% 3,506 67.2% 12 5,214 R+34.7
Sac 1,620 31.5% 3,478 67.6% 44 5,142 R+36.1
Grundy 1,212 23.9% 3,822 75.4% 38 5,072 R+51.5
Palo Alto 2,228 44.3% 2,772 55.2% 25 5,025 R+10.8
Jefferson 1,441 29.1% 3,449 69.6% 66 4,956 R+40.5
Butler 1,218 24.7% 3,686 74.6% 35 4,939 R+50.0
Union 1,720 35.0% 3,160 64.3% 33 4,913 R+29.3
Shelby 1,772 36.1% 3,075 62.6% 65 4,912 R+26.5
Madison 1,910 39.7% 2,829 58.7% 78 4,817 R+19.1
Howard 1,969 40.9% 2,845 59.1% 4,814 R+18.2
Montgomery 1,451 30.5% 3,304 69.4% 8 4,763 R+38.9
Calhoun 1,569 34.0% 3,001 65.0% 47 4,617 R+31.0
Winnebago 1,581 34.3% 2,993 65.0% 34 4,608 R+30.6
Guthrie 1,455 32.9% 2,924 66.2% 41 4,420 R+33.2
Monona 1,528 34.9% 2,834 64.7% 18 4,380 R+29.8
Franklin 1,176 27.3% 3,047 70.8% 83 4,306 R+43.5
Lyon 1,107 26.1% 3,128 73.7% 12 4,247 R+47.6
Hancock 1,469 34.8% 2,659 63.0% 93 4,221 R+28.2
Greene 1,374 32.9% 2,658 63.7% 143 4,175 R+30.8
Pocahontas 1,695 40.7% 2,415 58.0% 51 4,161 R+17.3
Humboldt 1,444 35.0% 2,633 63.9% 44 4,121 R+28.9
Emmet 1,404 34.1% 2,685 65.3% 25 4,114 R+31.1
Dickinson 1,339 32.7% 2,719 66.5% 32 4,090 R+33.7
Mitchell 1,134 27.9% 2,920 71.8% 14 4,068 R+43.9
Lucas 1,526 38.8% 2,358 60.0% 49 3,933 R+21.2
Monroe 1,646 42.4% 2,213 57.0% 25 3,884 R+14.6
Decatur 1,647 43.5% 2,102 55.6% 33 3,782 R+12.0
Wayne 1,412 37.7% 2,312 61.7% 26 3,750 R+24.0
Audubon 1,347 36.2% 2,364 63.5% 9 3,720 R+27.3
Taylor 1,259 34.5% 2,385 65.3% 9 3,653 R+30.8
Fremont 1,329 36.7% 2,285 63.1% 6 3,620 R+26.4
Ida 1,176 33.0% 2,368 66.5% 17 3,561 R+33.5
Mills 924 26.2% 2,590 73.6% 7 3,521 R+47.3
Adair 1,068 30.7% 2,378 68.4% 29 3,475 R+37.7
Clarke 1,388 40.1% 2,019 58.4% 53 3,460 R+18.2
Louisa 1,168 34.1% 2,218 64.8% 35 3,421 R+30.7
Worth 1,298 38.1% 2,093 61.5% 14 3,405 R+23.3
Davis 1,442 43.2% 1,865 55.9% 32 3,339 R+12.7
Osceola 1,067 32.6% 2,192 67.0% 15 3,274 R+34.4
Van Buren 963 31.2% 2,111 68.4% 13 3,087 R+37.2
Ringgold 892 31.4% 1,922 67.7% 23 2,837 R+36.3
Adams 849 35.0% 1,579 65.0% 1 2,429 R+30.1

Counties as they stood in 1966; 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