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United States · Election results history · 1920 Senate · Iowa
Election 1920 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.

1920 US Senate election in Iowa

Albert B. Cummins (Republican) beat Claude R. Porter (Democrat) in Iowa in 1920, 61.4% to 37.4%, a margin of 24.0 points and 206,484 votes.

The Republican hold continued from 1914, when Albert B. Cummins also won.

Republicans led in 94 of the 99 counties as they stood then and Democrats in 5. The largest, Polk, cast 51,702 votes and went to the Republican by 17.6 points. The closest was Adams, where 103 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
Albert B. Cummins won Republican 528,499 61.4%
Claude R. Porter Democratic 322,015 37.4%
All other candidates 9,956 1.2%
Total860,470

Every county

CountyDemocratRepublicanOthersTotalMargin
Polk 21,178 41.0% 30,260 58.5% 264 51,702 R+17.6
Woodbury 11,259 42.0% 15,399 57.4% 179 26,837 R+15.4
Linn 9,554 35.7% 17,046 63.7% 143 26,743 R+28.0
Scott 7,418 32.0% 14,152 61.0% 1,631 23,201 R+29.0
Black Hawk 5,677 26.8% 15,114 71.3% 414 21,205 R+44.5
Dubuque 10,816 53.5% 8,983 44.4% 424 20,223 D+9.1
Pottawattamie 8,178 40.6% 11,711 58.1% 251 20,140 R+17.5
Clinton 4,996 29.3% 9,291 54.5% 2,766 17,053 R+25.2
Lee 7,076 45.5% 8,411 54.1% 74 15,561 R+8.6
Wapello 6,183 43.9% 7,877 55.9% 39 14,099 R+12.0
Webster 4,266 34.0% 6,770 53.9% 1,513 12,549 R+20.0
Des Moines 5,183 42.2% 6,886 56.0% 221 12,290 R+13.9
Marshall 3,048 26.9% 8,249 72.8% 27 11,324 R+45.9
Johnson 5,652 52.8% 5,014 46.9% 35 10,701 D+6.0
Jasper 4,369 40.9% 6,301 59.0% 15 10,685 R+18.1
Muscatine 3,440 32.5% 7,089 66.9% 68 10,597 R+34.4
Cerro Gordo 3,708 35.2% 6,781 64.3% 55 10,544 R+29.1
Story 2,762 26.2% 7,759 73.6% 19 10,540 R+47.4
Mahaska 4,421 43.4% 5,730 56.3% 27 10,178 R+12.9
Fayette 3,510 34.6% 6,606 65.1% 39 10,155 R+30.5
Boone 4,348 45.2% 5,175 53.8% 100 9,623 R+8.6
Harrison 3,820 40.3% 5,640 59.5% 17 9,477 R+19.2
Appanoose 4,140 44.1% 5,211 55.5% 30 9,381 R+11.4
Marion 4,681 50.5% 4,560 49.2% 34 9,275 D+1.3
Dallas 3,662 39.9% 5,501 59.9% 14 9,177 R+20.0
Benton 3,442 38.0% 5,543 61.2% 71 9,056 R+23.2
Keokuk 3,970 44.2% 4,992 55.6% 18 8,980 R+11.4
Tama 3,387 38.2% 5,445 61.4% 30 8,862 R+23.2
Page 2,692 30.6% 6,084 69.1% 28 8,804 R+38.5
Winneshiek 3,095 36.0% 5,472 63.6% 40 8,607 R+27.6
Clayton 3,092 36.8% 5,298 63.0% 23 8,413 R+26.2
Jones 3,070 36.9% 5,234 62.9% 16 8,320 R+26.0
Carroll 4,461 54.0% 3,747 45.3% 57 8,265 D+8.6
Cass 2,466 30.0% 5,748 69.8% 16 8,230 R+39.9
Washington 3,137 39.7% 4,769 60.3% 5 7,911 R+20.6
Buchanan 2,327 29.5% 5,553 70.4% 12 7,892 R+40.9
Poweshiek 2,823 35.9% 5,035 64.0% 15 7,873 R+28.1
Kossuth 3,015 39.2% 4,651 60.5% 16 7,682 R+21.3
Sioux 2,368 31.2% 5,210 68.6% 14 7,592 R+37.4
Crawford 3,371 44.6% 4,100 54.3% 82 7,553 R+9.7
Plymouth 2,442 32.6% 5,001 66.8% 48 7,491 R+34.2
Hardin 1,808 24.3% 5,600 75.4% 23 7,431 R+51.0
Warren 2,783 37.8% 4,575 62.1% 7 7,365 R+24.3
Henry 2,779 38.6% 4,402 61.1% 25 7,206 R+22.5
Cedar 2,368 33.3% 4,730 66.4% 22 7,120 R+33.2
Hamilton 1,642 23.4% 5,329 76.1% 35 7,006 R+52.6
Floyd 1,648 23.6% 5,321 76.1% 23 6,992 R+52.5
Bremer 2,466 35.3% 4,489 64.3% 24 6,979 R+29.0
Delaware 1,690 24.4% 5,226 75.4% 16 6,932 R+51.0
Allamakee 2,419 35.3% 4,419 64.5% 13 6,851 R+29.2
Wright 2,138 31.3% 4,664 68.3% 24 6,826 R+37.0
Guthrie 2,403 35.3% 4,384 64.4% 21 6,808 R+29.1
Taylor 2,751 40.7% 3,994 59.1% 15 6,760 R+18.4
Decatur 3,225 47.8% 3,516 52.1% 5 6,746 R+4.3
Calhoun 2,423 36.1% 4,267 63.5% 30 6,720 R+27.4
Monroe 3,027 45.1% 3,608 53.8% 70 6,705 R+8.7
Wayne 2,983 44.6% 3,692 55.3% 6 6,681 R+10.6
Iowa 2,666 40.0% 3,977 59.7% 15 6,658 R+19.7
Union 3,241 48.8% 3,383 51.0% 14 6,638 R+2.1
Butler 1,569 23.7% 5,038 76.0% 18 6,625 R+52.4
Chickasaw 2,959 44.9% 3,615 54.9% 14 6,588 R+10.0
Shelby 2,725 42.3% 3,703 57.5% 10 6,438 R+15.2
Jackson 2,250 35.0% 4,103 63.8% 76 6,429 R+28.8
O'Brien 2,165 34.0% 4,181 65.6% 23 6,369 R+31.7
Monona 2,345 36.9% 4,010 63.0% 8 6,363 R+26.2
Greene 2,006 31.8% 4,286 68.0% 11 6,303 R+36.2
Madison 2,339 37.4% 3,912 62.5% 10 6,261 R+25.1
Montgomery 1,917 30.8% 4,311 69.2% 4 6,232 R+38.4
Fremont 2,715 43.9% 3,466 56.0% 5 6,186 R+12.1
Sac 1,755 28.8% 4,325 71.0% 13 6,093 R+42.2
Buena Vista 2,002 33.0% 4,048 66.7% 16 6,066 R+33.7
Jefferson 2,089 34.8% 3,893 64.9% 16 5,998 R+30.1
Van Buren 2,109 36.4% 3,684 63.5% 5 5,798 R+27.2
Pocahontas 2,343 41.1% 3,343 58.6% 15 5,701 R+17.5
Cherokee 1,837 32.2% 3,843 67.4% 20 5,700 R+35.2
Davis 2,798 51.2% 2,660 48.7% 6 5,464 D+2.5
Adair 2,036 37.3% 3,409 62.5% 8 5,453 R+25.2
Clay 1,573 29.0% 3,832 70.7% 16 5,421 R+41.7
Grundy 1,343 25.3% 3,947 74.4% 15 5,305 R+49.1
Lucas 2,308 43.7% 2,950 55.8% 27 5,285 R+12.1
Palo Alto 2,220 42.0% 3,036 57.5% 26 5,282 R+15.4
Howard 2,087 39.6% 3,162 60.0% 20 5,269 R+20.4
Mills 1,767 33.9% 3,429 65.9% 9 5,205 R+31.9
Mitchell 1,607 31.2% 3,514 68.3% 23 5,144 R+37.1
Ringgold 2,030 40.5% 2,980 59.4% 6 5,016 R+18.9
Franklin 1,218 24.7% 3,691 74.9% 19 4,928 R+50.2
Ida 1,711 37.8% 2,805 62.0% 6 4,522 R+24.2
Adams 2,205 48.8% 2,308 51.1% 5 4,518 R+2.3
Louisa 1,480 33.9% 2,871 65.8% 9 4,360 R+31.9
Winnebago 1,045 24.1% 3,266 75.4% 20 4,331 R+51.3
Hancock 1,402 32.4% 2,828 65.4% 95 4,325 R+33.0
Clarke 1,723 39.9% 2,589 60.0% 5 4,317 R+20.1
Audubon 1,869 43.5% 2,432 56.5% 4,301 R+13.1
Emmet 1,492 35.3% 2,712 64.2% 19 4,223 R+28.9
Humboldt 1,117 26.6% 3,056 72.8% 23 4,196 R+46.2
Lyon 1,178 29.1% 2,846 70.3% 23 4,047 R+41.2
Dickinson 1,154 28.9% 2,831 70.9% 6 3,991 R+42.0
Worth 1,054 27.3% 2,785 72.2% 20 3,859 R+44.9
Osceola 1,510 45.2% 1,825 54.6% 8 3,343 R+9.4

Counties as they stood in 1920; 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