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United States · Election results history · 1956 Senate · Iowa
Election 1956 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.

1956 US Senate election in Iowa

Bourke Hickenlooper (Republican) beat R.M. Evans (Democrat) in Iowa in 1956, 53.9% to 46.1%, a margin of 7.8 points and 92,343 votes.

The Republican hold continued from 1950, when Bourke Hickenlooper also won.

Republicans led in 80 of the 99 counties as they stood then and Democrats in 19. The largest, Polk, cast 110,189 votes and went to the Democrat by 3.5 points. The closest was Monona, where 7 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
Bourke Hickenlooper won Republican 635,499 53.9%
R.M. Evans Democratic 543,156 46.1%
Total1,178,655

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 57,050 51.8% 53,139 48.2% 110,189 D+3.5
Linn 24,553 45.7% 29,132 54.3% 53,685 R+8.5
Black Hawk 21,332 45.2% 25,880 54.8% 47,212 R+9.6
Scott 19,515 43.4% 25,418 56.6% 44,933 R+13.1
Woodbury 21,421 49.2% 22,076 50.8% 43,497 R+1.5
Pottawattamie 13,213 44.6% 16,386 55.4% 29,599 R+10.7
Dubuque 14,352 51.0% 13,777 49.0% 28,129 D+2.0
Clinton 9,138 41.1% 13,088 58.9% 22,226 R+17.8
Cerro Gordo 10,193 47.6% 11,225 52.4% 21,418 R+4.8
Wapello 11,435 55.2% 9,273 44.8% 20,708 D+10.4
Webster 10,692 54.1% 9,079 45.9% 19,771 D+8.2
Des Moines 9,400 48.5% 9,968 51.5% 19,368 R+2.9
Johnson 9,332 48.3% 10,003 51.7% 19,335 R+3.5
Lee 8,617 45.4% 10,358 54.6% 18,975 R+9.2
Story 7,208 38.1% 11,702 61.9% 18,910 R+23.8
Jasper 7,889 49.3% 8,128 50.7% 16,017 R+1.5
Marshall 6,387 42.2% 8,742 57.8% 15,129 R+15.6
Muscatine 6,089 44.0% 7,762 56.0% 13,851 R+12.1
Fayette 5,234 42.1% 7,204 57.9% 12,438 R+15.8
Sioux 3,258 27.7% 8,484 72.3% 11,742 R+44.5
Dallas 5,617 48.1% 6,072 51.9% 11,689 R+3.9
Boone 6,232 53.5% 5,419 46.5% 11,651 D+7.0
Kossuth 6,021 51.9% 5,576 48.1% 11,597 D+3.8
Marion 5,894 50.9% 5,689 49.1% 11,583 D+1.8
Clayton 4,805 45.8% 5,683 54.2% 10,488 R+8.4
Tama 5,028 48.2% 5,409 51.8% 10,437 R+3.7
Buena Vista 4,596 45.0% 5,626 55.0% 10,222 R+10.1
Page 3,413 33.6% 6,737 66.4% 10,150 R+32.7
Carroll 5,628 55.5% 4,512 44.5% 10,140 D+11.0
Mahaska 4,459 44.2% 5,633 55.8% 10,092 R+11.6
Winneshiek 4,544 45.1% 5,531 54.9% 10,075 R+9.8
Plymouth 3,923 39.3% 6,054 60.7% 9,977 R+21.4
Hardin 4,163 42.9% 5,542 57.1% 9,705 R+14.2
Floyd 4,048 42.3% 5,529 57.7% 9,577 R+15.5
Wright 4,363 47.6% 4,806 52.4% 9,169 R+4.8
Hamilton 4,230 46.3% 4,908 53.7% 9,138 R+7.4
Benton 4,238 47.3% 4,715 52.7% 8,953 R+5.3
Warren 4,271 48.0% 4,626 52.0% 8,897 R+4.0
Appanoose 4,336 49.2% 4,478 50.8% 8,814 R+1.6
Buchanan 3,816 43.7% 4,925 56.3% 8,741 R+12.7
Washington 3,333 38.7% 5,289 61.3% 8,622 R+22.7
Jones 3,667 42.5% 4,954 57.5% 8,621 R+14.9
Poweshiek 3,912 45.5% 4,689 54.5% 8,601 R+9.0
O'Brien 3,304 38.4% 5,295 61.6% 8,599 R+23.2
Harrison 3,710 43.5% 4,812 56.5% 8,522 R+12.9
Cass 3,030 35.7% 5,468 64.3% 8,498 R+28.7
Bremer 3,129 37.4% 5,240 62.6% 8,369 R+25.2
Henry 2,969 36.3% 5,203 63.7% 8,172 R+27.3
Jackson 3,457 42.6% 4,666 57.4% 8,123 R+14.9
Keokuk 3,940 49.0% 4,101 51.0% 8,041 R+2.0
Cedar 3,233 40.7% 4,707 59.3% 7,940 R+18.6
Sac 3,550 44.9% 4,359 55.1% 7,909 R+10.2
Delaware 2,965 37.5% 4,932 62.5% 7,897 R+24.9
Cherokee 3,566 45.5% 4,271 54.5% 7,837 R+9.0
Allamakee 2,845 37.1% 4,819 62.9% 7,664 R+25.8
Butler 2,479 32.7% 5,096 67.3% 7,575 R+34.5
Crawford 3,796 50.5% 3,718 49.5% 7,514 D+1.0
Shelby 3,575 47.7% 3,925 52.3% 7,500 R+4.7
Montgomery 2,883 38.8% 4,554 61.2% 7,437 R+22.5
Clay 3,333 44.9% 4,084 55.1% 7,417 R+10.1
Jefferson 2,993 41.0% 4,301 59.0% 7,294 R+17.9
Union 3,125 42.8% 4,168 57.2% 7,293 R+14.3
Iowa 3,134 43.5% 4,067 56.5% 7,201 R+13.0
Chickasaw 3,556 49.4% 3,637 50.6% 7,193 R+1.1
Monona 3,553 50.0% 3,560 50.0% 7,113 R+0.1
Palo Alto 3,947 57.0% 2,976 43.0% 6,923 D+14.0
Calhoun 3,291 48.4% 3,505 51.6% 6,796 R+3.1
Guthrie 3,274 48.4% 3,485 51.6% 6,759 R+3.1
Hancock 3,098 46.6% 3,550 53.4% 6,648 R+6.8
Franklin 2,712 41.0% 3,905 59.0% 6,617 R+18.0
Grundy 2,187 33.2% 4,409 66.8% 6,596 R+33.7
Greene 3,021 46.0% 3,543 54.0% 6,564 R+8.0
Mitchell 2,773 42.8% 3,702 57.2% 6,475 R+14.3
Pocahontas 3,662 56.9% 2,772 43.1% 6,434 D+13.8
Howard 3,234 50.4% 3,179 49.6% 6,413 D+0.9
Madison 2,926 46.3% 3,390 53.7% 6,316 R+7.3
Humboldt 3,059 48.7% 3,218 51.3% 6,277 R+2.5
Emmet 2,662 42.6% 3,586 57.4% 6,248 R+14.8
Winnebago 2,668 43.8% 3,425 56.2% 6,093 R+12.4
Lyon 1,976 33.8% 3,877 66.2% 5,853 R+32.5
Taylor 2,644 45.9% 3,121 54.1% 5,765 R+8.3
Wayne 2,792 48.6% 2,948 51.4% 5,740 R+2.7
Dickinson 3,026 53.0% 2,686 47.0% 5,712 D+6.0
Lucas 2,645 47.1% 2,973 52.9% 5,618 R+5.8
Adair 2,515 45.1% 3,058 54.9% 5,573 R+9.7
Decatur 2,918 53.1% 2,573 46.9% 5,491 D+6.3
Audubon 2,789 51.7% 2,608 48.3% 5,397 D+3.4
Fremont 2,400 44.9% 2,947 55.1% 5,347 R+10.2
Monroe 2,719 51.2% 2,592 48.8% 5,311 D+2.4
Mills 1,999 38.0% 3,260 62.0% 5,259 R+24.0
Ida 2,351 46.4% 2,712 53.6% 5,063 R+7.1
Worth 2,579 52.3% 2,352 47.7% 4,931 D+4.6
Davis 2,570 52.2% 2,354 47.8% 4,924 D+4.4
Louisa 1,982 41.2% 2,832 58.8% 4,814 R+17.7
Van Buren 1,937 40.3% 2,871 59.7% 4,808 R+19.4
Osceola 1,926 43.8% 2,474 56.2% 4,400 R+12.5
Ringgold 1,914 44.8% 2,356 55.2% 4,270 R+10.4
Clarke 2,026 48.4% 2,160 51.6% 4,186 R+3.2
Adams 1,964 50.9% 1,891 49.1% 3,855 D+1.9

Counties as they stood in 1956; 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