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United States · Election results history · 2018 House · Idaho
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 Idaho

Idaho elected 2 members of the House in 2018: Democrats won 0 seats and Republicans 2.

The closest was the 2nd district, decided by 21.3 points: Mike Simpson (Republican) beat Aaron Swisher (Democrat), 60.7% to 39.3%, a margin of 21.3 points and 59,893 votes.

In the House vote by county, Republicans led in 41 of the 44 counties and Democrats in 3. The largest, Ada, cast 187,362 votes and went to the Republican by 4.7 points. The closest was Clark, where 185 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 Cristina McNeil96,922 (30.8%) Russ Fulcher197,719 (62.8%) 20,428 R+32.0
2 Aaron Swisher110,381 (39.3%) Mike Simpson170,274 (60.7%) R+21.3

The House vote in every county

CountyDemocratRepublicanOthersTotalMargin
Ada 86,193 46.0% 95,068 50.7% 6,101 187,362 R+4.7
Canyon 17,690 28.2% 40,512 64.6% 4,490 62,692 R+36.4
Kootenai 16,665 29.7% 36,669 65.3% 2,846 56,180 R+35.6
Bonneville 9,446 27.1% 25,370 72.9% 34,816 R+45.7
Bannock 12,423 43.1% 16,370 56.9% 28,793 R+13.7
Twin Falls 6,865 28.5% 17,246 71.5% 24,111 R+43.1
Bonner 6,061 33.3% 11,067 60.7% 1,093 18,221 R+27.5
Latah 8,177 52.6% 6,307 40.6% 1,054 15,538 D+12.0
Nez Perce 4,930 34.8% 8,225 58.1% 1,012 14,167 R+23.3
Bingham 3,054 23.5% 9,927 76.5% 12,981 R+52.9
Blaine 6,764 64.8% 3,670 35.2% 10,434 D+29.7
Madison 1,410 16.2% 7,292 83.8% 8,702 R+67.6
Jefferson 1,183 13.8% 7,379 86.2% 8,562 R+72.4
Payette 1,471 19.7% 5,464 73.2% 526 7,461 R+53.5
Gem 1,315 18.8% 5,173 74.0% 499 6,987 R+55.2
Elmore 1,991 28.8% 4,933 71.2% 6,924 R+42.5
Idaho 1,276 18.5% 5,191 75.4% 422 6,889 R+56.8
Cassia 1,027 16.9% 5,067 83.1% 6,094 R+66.3
Jerome 1,299 24.5% 4,000 75.5% 5,299 R+51.0
Valley 2,123 41.7% 2,608 51.2% 359 5,090 R+9.5
Minidoka 1,081 21.3% 4,004 78.7% 5,085 R+57.5
Teton 2,503 52.7% 2,244 47.3% 4,747 D+5.5
Fremont 751 15.9% 3,981 84.1% 4,732 R+68.3
Gooding 958 21.9% 3,414 78.1% 4,372 R+56.2
Boundary 929 22.2% 3,005 71.6% 260 4,194 R+49.5
Shoshone 1,427 34.6% 2,328 56.4% 375 4,130 R+21.8
Washington 790 20.5% 2,833 73.7% 223 3,846 R+53.1
Franklin 399 10.5% 3,396 89.5% 3,795 R+79.0
Benewah 894 24.7% 2,471 68.4% 250 3,615 R+43.6
Boise 800 23.3% 2,346 68.5% 281 3,427 R+45.1
Lemhi 802 23.5% 2,608 76.5% 3,410 R+53.0
Owyhee 599 17.6% 2,586 76.0% 217 3,402 R+58.4
Clearwater 710 23.0% 2,188 70.9% 190 3,088 R+47.9
Caribou 323 14.4% 1,916 85.6% 2,239 R+71.1
Power 648 29.7% 1,537 70.3% 2,185 R+40.7
Bear Lake 291 13.6% 1,844 86.4% 2,135 R+72.7
Custer 453 22.0% 1,609 78.0% 2,062 R+56.1
Adams 427 23.0% 1,291 69.6% 138 1,856 R+46.6
Oneida 199 13.3% 1,292 86.7% 1,491 R+73.3
Lincoln 350 24.0% 1,111 76.0% 1,461 R+52.1
Lewis 266 19.5% 1,006 73.8% 92 1,364 R+54.3
Butte 175 17.3% 836 82.7% 1,011 R+65.4
Camas 133 25.3% 392 74.7% 525 R+49.3
Clark 32 12.9% 217 87.1% 249 R+74.3

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

Idaho in every House election we hold

YearSeatsHouse vote
2024 D 0, R 2 R+38.5
2022 D 0, R 2 R+36.7
2020 D 0, R 2 R+36.0
2018 D 0, R 2 R+27.0
2016 D 0, R 2 R+35.0
2014 D 0, R 2 R+26.4
2012 D 0, R 2 R+31.3
2010 D 0, R 2 R+25.2
2008 D 1, R 1 R+18.5
2006 D 0, R 2 R+15.9
2004 D 0, R 2 R+40.2
2002 D 0, R 2 R+29.2
2000 D 0, R 2 R+38.6
1998 D 0, R 2 R+9.3
1996 D 0, R 2 R+19.5
1994 D 0, R 2 R+29.9
1992 D 1, R 1 R+1.8
1990 D 2, R 0 D+16.4