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United States · Election results history · 2018 House · Iowa
Election 2018 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.

2018 US House elections in Iowa

Iowa elected 4 members of the House in 2018: Democrats won 3 seats and Republicans 1.

The closest was the 3rd district, decided by 2.2 points: Cindy Axne (Democrat) beat David Young (Republican), 49.3% to 47.1%, a margin of 2.2 points and 7,709 votes.

In the House vote by county, Republicans led in 79 of the 99 counties and Democrats in 20. The largest, Polk, cast 205,464 votes and went to the Democrat by 16.3 points. The closest was Buena Vista, where 50 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.

Every district

DistrictDemocratVotesRepublicanVotesOthersMargin
1 Abby Finkenauer170,342 (51.0%) Rod Blum153,442 (45.9%) 10,459 D+5.1
2 Dave Loebsack171,446 (54.8%) Christopher Peters133,287 (42.6%) 8,180 D+12.2
3 Cindy Axne175,642 (49.3%) David Young167,933 (47.1%) 12,666 D+2.2
4 J.D. Scholten147,246 (47.0%) Steve King157,676 (50.3%) 8,329 R+3.3

The House vote in every county

CountyDemocratRepublicanOthersTotalMargin
Polk 115,877 56.4% 82,404 40.1% 7,183 205,464 D+16.3
Linn 57,712 56.7% 40,733 40.0% 3,422 101,867 D+16.7
Scott 38,282 55.5% 29,012 42.1% 1,627 68,921 D+13.5
Johnson 49,010 72.4% 16,998 25.1% 1,666 67,674 D+47.3
Black Hawk 29,667 55.8% 22,103 41.6% 1,353 53,123 D+14.2
Dubuque 22,359 52.3% 19,282 45.1% 1,106 42,747 D+7.2
Story 27,569 64.9% 13,474 31.7% 1,460 42,503 D+33.2
Dallas 18,593 45.4% 21,089 51.5% 1,266 40,948 R+6.1
Woodbury 18,686 53.2% 15,708 44.7% 751 35,145 D+8.5
Pottawattamie 14,044 41.6% 18,181 53.8% 1,572 33,797 R+12.2
Warren 10,363 43.1% 12,778 53.1% 910 24,051 R+10.0
Cerro Gordo 10,688 56.6% 7,620 40.3% 587 18,895 D+16.2
Clinton 9,864 54.8% 7,725 42.9% 415 18,004 D+11.9
Jasper 7,519 48.2% 7,622 48.8% 465 15,606 R+0.7
Des Moines 8,546 56.8% 6,138 40.8% 373 15,057 D+16.0
Marion 5,630 37.9% 8,796 59.2% 434 14,860 R+21.3
Muscatine 7,797 52.7% 6,569 44.4% 428 14,794 D+8.3
Sioux 3,682 24.9% 10,824 73.3% 262 14,768 R+48.4
Marshall 6,611 46.7% 7,124 50.4% 411 14,146 R+3.6
Webster 6,918 49.4% 6,706 47.9% 385 14,009 D+1.5
Lee 6,515 52.4% 5,578 44.9% 333 12,426 D+7.5
Boone 6,353 52.6% 5,350 44.3% 371 12,074 D+8.3
Benton 4,698 40.6% 6,465 55.8% 418 11,581 R+15.3
Bremer 5,182 45.4% 5,908 51.7% 329 11,419 R+6.4
Wapello 5,775 51.1% 5,169 45.7% 360 11,304 D+5.4
Plymouth 4,084 37.9% 6,503 60.3% 197 10,784 R+22.4
Winneshiek 5,102 51.8% 4,364 44.3% 392 9,858 D+7.5
Washington 4,272 47.0% 4,595 50.5% 230 9,097 R+3.6
Carroll 4,075 45.7% 4,652 52.1% 194 8,921 R+6.5
Dickinson 3,931 44.7% 4,676 53.2% 180 8,787 R+8.5
Jones 3,787 44.2% 4,490 52.4% 288 8,565 R+8.2
Jackson 3,797 44.6% 4,483 52.7% 232 8,512 R+8.1
Buchanan 3,977 47.0% 4,166 49.3% 310 8,453 R+2.2
Mahaska 2,712 32.1% 5,489 65.0% 247 8,448 R+32.9
Poweshiek 3,966 48.1% 4,044 49.1% 232 8,242 R+0.9
Fayette 3,701 45.2% 4,167 50.8% 328 8,196 R+5.7
Cedar 4,098 50.9% 3,725 46.3% 221 8,044 D+4.6
Clayton 3,311 42.0% 4,320 54.7% 261 7,892 R+12.8
Madison 2,589 34.0% 4,749 62.4% 278 7,616 R+28.4
Iowa 3,099 40.8% 4,203 55.3% 293 7,595 R+14.5
Delaware 2,810 37.5% 4,475 59.7% 212 7,497 R+22.2
Henry 3,211 43.4% 3,950 53.4% 241 7,402 R+10.0
Tama 3,257 44.7% 3,780 51.9% 243 7,280 R+7.2
Kossuth 3,171 43.6% 3,942 54.2% 158 7,271 R+10.6
Hardin 3,027 42.3% 3,917 54.7% 211 7,155 R+12.4
Jefferson 4,201 59.8% 2,644 37.6% 178 7,023 D+22.2
Clay 3,125 45.6% 3,555 51.8% 180 6,860 R+6.3
Buena Vista 3,178 48.4% 3,228 49.1% 162 6,568 R+0.8
Hamilton 2,942 46.4% 3,215 50.7% 181 6,338 R+4.3
Mills 2,146 34.0% 3,941 62.5% 221 6,308 R+28.5
Floyd 3,205 51.2% 2,841 45.4% 211 6,257 D+5.8
Butler 2,199 36.2% 3,675 60.5% 196 6,070 R+24.3
Harrison 2,237 37.4% 3,559 59.5% 189 5,985 R+22.1
O'Brien 1,916 32.9% 3,795 65.2% 108 5,819 R+32.3
Cass 1,777 30.8% 3,829 66.3% 166 5,772 R+35.6
Grundy 1,996 35.0% 3,540 62.1% 167 5,703 R+27.1
Allamakee 2,353 41.6% 3,073 54.4% 226 5,652 R+12.7
Page 1,741 30.9% 3,776 67.0% 115 5,632 R+36.1
Crawford 2,248 41.5% 3,025 55.9% 142 5,415 R+14.3
Chickasaw 2,345 45.3% 2,671 51.6% 165 5,181 R+6.3
Lyon 1,355 26.2% 3,716 71.8% 101 5,172 R+45.6
Cherokee 2,359 45.8% 2,702 52.5% 88 5,149 R+6.7
Shelby 1,817 36.1% 3,070 61.0% 144 5,031 R+24.9
Guthrie 1,622 32.5% 3,159 63.3% 211 4,992 R+30.8
Appanoose 2,055 41.5% 2,770 55.9% 132 4,957 R+14.4
Wright 2,085 42.7% 2,650 54.2% 151 4,886 R+11.6
Union 1,717 35.4% 2,930 60.3% 210 4,857 R+25.0
Hancock 1,843 38.7% 2,765 58.0% 160 4,768 R+19.3
Winnebago 2,181 47.4% 2,233 48.6% 183 4,597 R+1.1
Mitchell 1,836 40.8% 2,518 55.9% 148 4,502 R+15.1
Sac 1,686 39.1% 2,549 59.1% 80 4,315 R+20.0
Calhoun 1,842 43.1% 2,318 54.2% 118 4,278 R+11.1
Franklin 1,717 42.2% 2,229 54.8% 121 4,067 R+12.6
Humboldt 1,465 36.2% 2,481 61.2% 106 4,052 R+25.1
Greene 1,945 48.0% 1,999 49.4% 106 4,050 R+1.3
Keokuk 1,574 39.0% 2,377 58.9% 88 4,039 R+19.9
Montgomery 1,209 30.6% 2,631 66.5% 117 3,957 R+35.9
Monona 1,671 43.9% 2,055 54.0% 83 3,809 R+10.1
Louisa 1,679 44.3% 2,031 53.6% 82 3,792 R+9.3
Emmet 1,743 46.9% 1,879 50.5% 98 3,720 R+3.7
Palo Alto 1,701 46.0% 1,925 52.0% 74 3,700 R+6.1
Clarke 1,525 42.2% 1,939 53.6% 153 3,617 R+11.4
Howard 1,587 43.9% 1,878 52.0% 146 3,611 R+8.1
Lucas 1,295 36.9% 2,106 60.0% 107 3,508 R+23.1
Worth 1,530 43.7% 1,866 53.2% 109 3,505 R+9.6
Adair 1,067 31.4% 2,205 64.9% 125 3,397 R+33.5
Pocahontas 1,201 38.5% 1,831 58.7% 88 3,120 R+20.2
Davis 1,389 44.8% 1,646 53.0% 68 3,103 R+8.3
Monroe 1,294 41.7% 1,717 55.3% 92 3,103 R+13.6
Fremont 990 32.8% 1,933 64.0% 95 3,018 R+31.2
Ida 1,117 38.0% 1,757 59.8% 64 2,938 R+21.8
Van Buren 1,197 41.3% 1,634 56.4% 68 2,899 R+15.1
Decatur 1,122 38.9% 1,651 57.2% 113 2,886 R+18.3
Audubon 1,234 46.2% 1,378 51.6% 57 2,669 R+5.4
Taylor 673 27.7% 1,683 69.3% 72 2,428 R+41.6
Osceola 709 29.3% 1,663 68.7% 50 2,422 R+39.4
Wayne 884 37.6% 1,406 59.9% 59 2,349 R+22.2
Ringgold 716 31.5% 1,493 65.7% 65 2,274 R+34.2
Adams 518 29.9% 1,152 66.6% 60 1,730 R+36.6

Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Iowa in every House election we hold

YearSeatsHouse vote
2024 D 0, R 4 R+13.0
2022 D 0, R 4 R+12.5
2020 D 1, R 3 R+5.9
2018 D 3, R 1 D+4.0
2016 D 1, R 3 R+9.2
2014 D 1, R 3 R+7.7
2012 D 2, R 2 D+3.0
2010 D 3, R 2 R+10.6
2008 D 3, R 2 D+4.1
2006 D 3, R 2 R+2.9
2004 D 1, R 4 R+13.6
2002 D 1, R 4 R+9.2
2000 D 1, R 4 R+14.6
1998 D 1, R 4 R+23.7
1996 D 1, R 4 R+9.8
1994 D 0, R 5 R+15.6
1992 D 1, R 4 R+19.0
1990 D 2, R 4 D+2.0