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United States · Election results history · 2018 Senate · Montana
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 Senate election in Montana

Jon Tester (Democrat) beat Matt Rosendale (Republican) in Montana in 2018, 50.3% to 46.8%, a margin of 3.6 points and 17,913 votes.

The Democratic hold continued from 2012, when Jon Tester also won.

Republicans led in 43 of the 56 counties and Democrats in 13. The largest, Yellowstone, cast 69,258 votes and went to the Republican by 3.5 points. The closest was Chouteau, where 37 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
Jon Tester won Democratic 253,876 50.3%
Matt Rosendale Republican 235,963 46.8%
All other candidates 14,545 2.9%
Total504,384

Every county

CountyDemocratRepublicanOthersTotalMargin
Yellowstone 32,225 46.5% 34,682 50.1% 2,351 69,258 R+3.5
Missoula 41,688 67.6% 18,631 30.2% 1,332 61,651 D+37.4
Gallatin 33,251 59.4% 21,248 38.0% 1,434 55,933 D+21.5
Flathead 19,652 41.1% 26,759 56.0% 1,349 47,760 R+14.9
Lewis and Clark 20,506 57.7% 14,106 39.7% 927 35,539 D+18.0
Cascade 17,435 51.3% 15,566 45.8% 1,008 34,009 D+5.5
Ravalli 9,156 39.1% 13,622 58.2% 623 23,401 R+19.1
Silver Bow 11,672 71.6% 4,246 26.0% 394 16,312 D+45.5
Lake 6,916 50.2% 6,491 47.1% 365 13,772 D+3.1
Park 5,114 52.6% 4,357 44.8% 253 9,724 D+7.8
Lincoln 2,902 31.1% 6,137 65.7% 298 9,337 R+34.6
Jefferson 2,954 43.2% 3,653 53.5% 226 6,833 R+10.2
Hill 3,729 58.4% 2,434 38.1% 227 6,390 D+20.3
Sanders 2,071 33.7% 3,856 62.7% 227 6,154 R+29.0
Carbon 2,680 44.2% 3,209 52.9% 178 6,067 R+8.7
Fergus 1,964 33.9% 3,640 62.8% 189 5,793 R+28.9
Glacier 3,754 75.1% 1,153 23.1% 89 4,996 D+52.1
Madison 1,890 38.1% 2,898 58.4% 171 4,959 R+20.3
Beaverhead 1,876 38.3% 2,866 58.5% 155 4,897 R+20.2
Custer 1,942 39.8% 2,762 56.6% 179 4,883 R+16.8
Stillwater 1,501 30.9% 3,206 65.9% 157 4,864 R+35.1
Big Horn 3,027 64.7% 1,558 33.3% 91 4,676 D+31.4
Richland 1,136 26.2% 3,017 69.6% 179 4,332 R+43.4
Deer Lodge 2,892 68.3% 1,208 28.5% 136 4,236 D+39.8
Dawson 1,233 30.3% 2,700 66.3% 140 4,073 R+36.0
Valley 1,545 39.8% 2,137 55.0% 200 3,882 R+15.2
Roosevelt 2,013 58.4% 1,346 39.0% 88 3,447 D+19.4
Rosebud 1,511 44.9% 1,765 52.4% 91 3,367 R+7.5
Broadwater 1,071 32.8% 2,086 64.0% 104 3,261 R+31.1
Teton 1,290 40.9% 1,784 56.5% 83 3,157 R+15.6
Blaine 1,961 65.0% 982 32.5% 76 3,019 D+32.4
Powell 1,026 37.2% 1,641 59.5% 93 2,760 R+22.3
Pondera 1,176 43.8% 1,413 52.6% 96 2,685 R+8.8
Chouteau 1,275 48.0% 1,312 49.4% 70 2,657 R+1.4
Musselshell 573 23.6% 1,743 71.7% 116 2,432 R+48.1
Sweet Grass 652 31.1% 1,372 65.4% 74 2,098 R+34.3
Phillips 577 27.7% 1,426 68.5% 79 2,082 R+40.8
Mineral 785 38.1% 1,181 57.4% 92 2,058 R+19.2
Toole 626 32.9% 1,208 63.5% 69 1,903 R+30.6
Sheridan 712 39.3% 1,017 56.1% 83 1,812 R+16.8
Granite 695 38.8% 1,046 58.3% 52 1,793 R+19.6
Fallon 281 21.8% 951 73.8% 57 1,289 R+52.0
Judith Basin 388 32.6% 752 63.1% 51 1,191 R+30.6
McCone 227 22.1% 773 75.1% 29 1,029 R+53.1
Liberty 365 37.2% 586 59.7% 30 981 R+22.5
Meagher 319 32.7% 629 64.4% 28 976 R+31.8
Powder River 203 20.9% 748 76.9% 22 973 R+56.0
Daniels 281 29.9% 631 67.1% 29 941 R+37.2
Wheatland 315 33.8% 586 62.8% 32 933 R+29.0
Carter 128 17.0% 602 80.1% 22 752 R+63.0
Garfield 81 11.9% 571 83.7% 30 682 R+71.8
Prairie 177 27.1% 450 68.9% 26 653 R+41.8
Wibaux 140 25.8% 390 72.0% 12 542 R+46.1
Golden Valley 130 28.6% 303 66.7% 21 454 R+38.1
Treasure 129 31.2% 279 67.4% 6 414 R+36.2
Petroleum 58 18.6% 248 79.5% 6 312 R+60.9

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

Montana Senate elections we hold

YearWinnerMargin
2024 Tim Sheehy (R) R+7.1
2020 Steve Daines (R) R+10.0
2018 Jon Tester (D) D+3.6
2014 Steve Daines (R) R+17.7
2012 Jon Tester (D) D+3.7
2008 Max Baucus (D) D+45.8
2006 Jon Tester (D) D+0.9
2002 Max Baucus (D) D+31.0
2000 Conrad Burns (R) R+3.3
1996 Max Baucus (D) D+4.9
1994 Conrad R. Burns (R) R+24.7
1990 Max Baucus (D) D+38.7
1988 Conrad Burns (R) R+3.7
1984 Max Baucus (D) D+16.2
1982 John Melcher (D) D+12.8
1978 Max Baucus (D) D+11.4
1976 John Melcher (D) D+28.3
1972 Lee Metcalf (D) D+3.9
1970 Mike Mansfield (D) D+21.1
1966 Lee Metcalf (D) D+6.3
1964 Mike Mansfield (D) D+29.0
1960 Lee Metcalf (D) D+1.5
1958 Mike Mansfield (D) D+52.4
1954 James E. Murray (D) D+0.8
1952 Mike Mansfield (D) D+2.2
1948 James E. Murray (D) D+13.9
1946 Zales N. Ecton (R) R+8.1
1942 James E. Murray (D) D+0.7
1940 Burton K. Wheeler (D) D+46.9
1936 James E. Murray (D) D+27.9
1934 Burton K. Wheeler (D) D+41.4
1930 Thomas J. Walsh (D) D+22.5
1928 Burton K. Wheeler (D) D+6.4
1924 Thomas J. Walsh (D) D+10.4
1922 Burton K. Wheeler (D) D+11.8
1918 Thomas J. Walsh (D) D+5.3
1916 Henry L. Myers (D) D+7.7