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United States · Election results history · 2018 Senate · California
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 California

Dianne Feinstein (Democrat) beat Kevin de León (independent) in California in 2018, 54.2% to 45.8%, a margin of 8.3 points and 925,480 votes.

The Democratic hold continued from 2012, when Dianne Feinstein also won.

Democrats led in 58 of the 58 counties. The largest, Los Angeles, cast 2,711,211 votes and went to the Democrat by 100.0 points. The closest was Alpine, where 547 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
Dianne Feinstein won Democratic 6,019,422 54.2%
Kevin de León Democratic 5,093,942 45.8%
Total11,113,364

Every county

CountyDemocratRepublicanOthersTotalMargin
Los Angeles 2,711,211 100.0% 0 0.0% 2,711,211 D+100.0
San Diego 995,192 100.0% 0 0.0% 995,192 D+100.0
Orange 922,492 100.0% 0 0.0% 922,492 D+100.0
Santa Clara 568,508 100.0% 0 0.0% 568,508 D+100.0
Riverside 547,976 100.0% 0 0.0% 547,976 D+100.0
Alameda 545,327 100.0% 0 0.0% 545,327 D+100.0
San Bernardino 466,463 100.0% 0 0.0% 466,463 D+100.0
Sacramento 455,520 100.0% 0 0.0% 455,520 D+100.0
Contra Costa 381,097 100.0% 0 0.0% 381,097 D+100.0
San Francisco 352,121 100.0% 0 0.0% 352,121 D+100.0
San Mateo 267,815 100.0% 0 0.0% 267,815 D+100.0
Ventura 267,242 100.0% 0 0.0% 267,242 D+100.0
Fresno 217,048 100.0% 0 0.0% 217,048 D+100.0
Sonoma 193,692 100.0% 0 0.0% 193,692 D+100.0
San Joaquin 171,439 100.0% 0 0.0% 171,439 D+100.0
Kern 166,609 100.0% 0 0.0% 166,609 D+100.0
Placer 143,311 100.0% 0 0.0% 143,311 D+100.0
Santa Barbara 136,491 100.0% 0 0.0% 136,491 D+100.0
Stanislaus 136,099 100.0% 0 0.0% 136,099 D+100.0
Solano 132,680 100.0% 0 0.0% 132,680 D+100.0
Marin 122,957 100.0% 0 0.0% 122,957 D+100.0
Santa Cruz 111,594 100.0% 0 0.0% 111,594 D+100.0
San Luis Obispo 107,269 100.0% 0 0.0% 107,269 D+100.0
Monterey 106,882 100.0% 0 0.0% 106,882 D+100.0
Tulare 82,770 100.0% 0 0.0% 82,770 D+100.0
Butte 75,526 100.0% 0 0.0% 75,526 D+100.0
El Dorado 72,563 100.0% 0 0.0% 72,563 D+100.0
Yolo 67,622 100.0% 0 0.0% 67,622 D+100.0
Shasta 55,624 100.0% 0 0.0% 55,624 D+100.0
Merced 51,644 100.0% 0 0.0% 51,644 D+100.0
Napa 51,194 100.0% 0 0.0% 51,194 D+100.0
Humboldt 47,655 100.0% 0 0.0% 47,655 D+100.0
Nevada 46,109 100.0% 0 0.0% 46,109 D+100.0
Madera 32,316 100.0% 0 0.0% 32,316 D+100.0
Mendocino 30,642 100.0% 0 0.0% 30,642 D+100.0
Imperial 30,271 100.0% 0 0.0% 30,271 D+100.0
Kings 25,347 100.0% 0 0.0% 25,347 D+100.0
Sutter 24,667 100.0% 0 0.0% 24,667 D+100.0
Tuolumne 19,054 100.0% 0 0.0% 19,054 D+100.0
Lake 18,459 100.0% 0 0.0% 18,459 D+100.0
San Benito 17,978 100.0% 0 0.0% 17,978 D+100.0
Calaveras 17,388 100.0% 0 0.0% 17,388 D+100.0
Tehama 16,688 100.0% 0 0.0% 16,688 D+100.0
Yuba 15,890 100.0% 0 0.0% 15,890 D+100.0
Siskiyou 14,702 100.0% 0 0.0% 14,702 D+100.0
Amador 14,079 100.0% 0 0.0% 14,079 D+100.0
Plumas 7,243 100.0% 0 0.0% 7,243 D+100.0
Del Norte 6,844 100.0% 0 0.0% 6,844 D+100.0
Lassen 6,818 100.0% 0 0.0% 6,818 D+100.0
Glenn 6,729 100.0% 0 0.0% 6,729 D+100.0
Mariposa 6,688 100.0% 0 0.0% 6,688 D+100.0
Inyo 5,876 100.0% 0 0.0% 5,876 D+100.0
Colusa 4,682 100.0% 0 0.0% 4,682 D+100.0
Trinity 4,584 100.0% 0 0.0% 4,584 D+100.0
Mono 4,198 100.0% 0 0.0% 4,198 D+100.0
Modoc 2,618 100.0% 0 0.0% 2,618 D+100.0
Sierra 1,314 100.0% 0 0.0% 1,314 D+100.0
Alpine 547 100.0% 0 0.0% 547 D+100.0

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

California Senate elections we hold

YearWinnerMargin
2024 Adam B. Schiff (D) D+17.7
2022 Alex Padilla (D) D+22.1
2018 Dianne Feinstein (D) D+54.2
2016 Kamala Harris (D) D+61.6
2012 Dianne Feinstein (D) D+25.0
2010 Barbara Boxer (D) D+10.0
2006 Dianne Feinstein (D) D+24.4
2004 Barbara Boxer (D) D+19.9
2000 Dianne Feinstein (D) D+19.3
1998 Barbara Boxer (D) D+10.0
1994 Dianne Feinstein (D) D+1.9
1992 Barbara Boxer (D) D+4.9
1988 Pete Wilson (R) R+8.8
1986 Alan Cranston (D) D+1.4
1982 Pete Wilson (R) R+6.8
1980 Alan Cranston (D) D+19.4
1976 S. I. Hayakawa (R) R+3.3
1974 Alan Cranston (D) D+24.3
1970 John V. Tunney (D) D+9.5
1968 Alan Cranston (D) D+4.9
1964 George Murphy (R) R+3.1
1962 Thomas Kuchel (R) R+12.9
1958 Clair Engle (D) D+14.1
1956 Thomas Kuchel (R) R+8.3
1952 William Knowland (R) R+87.8
1950 Richard M. Nixon (R) R+18.5
1946 William F. Knowland (R) R+9.9
1944 Sheridan Downey (D) D+4.6
1940 Hiram W. Johnson (R) R+82.5
1938 Sheridan Downey (D) D+9.8
1934 Hiram Johnson (R) R+94.5
1932 William Gibbs McAdoo (D) D+12.6
1928 Hiram W. Johnson (R) R+55.9
1926 Samuel M. Shortridge (R) R+26.2
1922 Hiram W. Johnson (R) R+38.4
1920 Samuel M. Shortridge (R) R+8.3
1916 Hiram W. Johnson (R) R+31.6
1914 James D. Phelan (D) D+2.9