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United States · Election results history · 1966 Senate · Colorado
Election 1966 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.

1966 US Senate election in Colorado

Gordon Allott (Republican) beat Roy Romer (Democrat) in Colorado in 1966, 58.0% to 41.9%, a margin of 16.1 points and 102,048 votes.

The Republican hold continued from 1960, when Gordon Allott also won.

Republicans led in 55 of the 63 counties as they stood then and Democrats in 8. The largest, Denver, cast 168,960 votes and went to the Republican by 4.0 points. The closest was Mineral, where 12 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
Gordon Allott won Republican 368,307 58.0%
Roy Romer Democratic 266,259 41.9%
All other candidates 332 0.1%
Total634,898

Every county

CountyDemocratRepublicanOthersTotalMargin
Denver 81,035 48.0% 87,763 51.9% 162 168,960 R+4.0
Jefferson 23,106 36.3% 40,467 63.7% 63,573 R+27.3
El Paso 15,892 36.5% 27,694 63.5% 43,586 R+27.1
Arapahoe 14,614 34.5% 27,698 65.4% 26 42,338 R+30.9
Adams 19,469 49.9% 19,537 50.1% 39,006 R+0.2
Pueblo 21,087 54.7% 17,467 45.3% 21 38,575 D+9.4
Boulder 11,788 37.2% 19,885 62.7% 53 31,726 R+25.5
Weld 8,757 35.9% 15,603 64.0% 7 24,367 R+28.1
Larimer 6,146 31.5% 13,338 68.4% 15 19,499 R+36.9
Mesa 6,313 34.8% 11,809 65.2% 18,122 R+30.3
Otero 3,958 45.7% 4,675 53.9% 35 8,668 R+8.3
Fremont 3,436 39.9% 5,166 60.1% 8,602 R+20.1
Las Animas 4,645 60.5% 3,038 39.5% 7,683 D+20.9
Morgan 2,310 34.1% 4,455 65.9% 6,765 R+31.7
Logan 2,359 36.0% 4,197 64.0% 6,556 R+28.0
La Plata 2,091 33.3% 4,196 66.7% 6,287 R+33.5
Montrose 1,775 29.2% 4,296 70.8% 6,071 R+41.5
Delta 1,669 28.5% 4,186 71.5% 5,855 R+43.0
Garfield 1,685 33.4% 3,354 66.6% 5,039 R+33.1
Prowers 1,921 38.6% 3,051 61.4% 4,972 R+22.7
Yuma 1,359 35.3% 2,491 64.7% 3,850 R+29.4
Montezuma 1,391 36.3% 2,440 63.7% 3,831 R+27.4
Chaffee 1,524 41.6% 2,143 58.4% 3,667 R+16.9
Rio Grande 1,396 39.5% 2,140 60.5% 3,536 R+21.0
Alamosa 1,471 42.2% 2,016 57.8% 3,487 R+15.6
Huerfano 2,041 61.6% 1,270 38.4% 3,311 D+23.3
Kit Carson 985 34.3% 1,886 65.7% 2,871 R+31.4
Conejos 1,329 46.7% 1,518 53.3% 2,847 R+6.6
Routt 1,167 42.2% 1,596 57.8% 2,763 R+15.5
Moffat 868 32.4% 1,810 67.6% 2,678 R+35.2
Bent 1,623 61.4% 1,019 38.6% 2,642 D+22.9
Washington 847 32.7% 1,742 67.3% 2,589 R+34.6
Douglas 794 33.5% 1,573 66.3% 5 2,372 R+32.8
Baca 877 37.3% 1,476 62.7% 2,353 R+25.5
Lake 1,352 59.3% 927 40.7% 2,279 D+18.6
Gunnison 733 32.8% 1,499 67.2% 2,232 R+34.3
Lincoln 748 37.2% 1,261 62.8% 2,009 R+25.5
Phillips 703 36.6% 1,217 63.4% 1,920 R+26.8
Eagle 809 43.4% 1,053 56.6% 1,862 R+13.1
Rio Blanco 577 31.7% 1,245 68.3% 1,822 R+36.7
Clear Creek 677 40.2% 1,008 59.8% 1,685 R+19.6
Elbert 530 31.5% 1,151 68.5% 1,681 R+36.9
Costilla 1,116 67.4% 541 32.6% 1,657 D+34.7
Sedgwick 609 36.8% 1,048 63.2% 1,657 R+26.5
Saguache 714 43.8% 916 56.2% 1,630 R+12.4
Grand 461 29.7% 1,090 70.2% 1 1,552 R+40.5
Crowley 596 39.8% 900 60.1% 2 1,498 R+20.3
Teller 539 43.8% 693 56.3% 1,232 R+12.5
Kiowa 477 38.9% 748 61.1% 1,225 R+22.1
Cheyenne 420 34.9% 781 64.9% 2 1,203 R+30.0
Pitkin 531 53.1% 469 46.9% 1,000 D+6.2
Park 388 39.9% 584 60.0% 1 973 R+20.1
Archuleta 508 52.8% 454 47.2% 962 D+5.6
San Miguel 288 36.2% 508 63.8% 796 R+27.6
Ouray 233 29.6% 555 70.4% 788 R+40.9
Custer 256 35.2% 471 64.8% 727 R+29.6
Jackson 209 28.9% 513 71.1% 722 R+42.1
Summit 231 32.4% 482 67.6% 713 R+35.2
Dolores 305 44.6% 379 55.4% 684 R+10.8
Gilpin 244 41.7% 341 58.3% 585 R+16.6
San Juan 109 32.3% 226 67.1% 2 337 R+34.7
Mineral 131 47.8% 143 52.2% 274 R+4.4
Hinsdale 37 25.3% 109 74.7% 146 R+49.3

Counties as they stood in 1966; 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.

Colorado Senate elections we hold

YearWinnerMargin
2022 Michael Bennet (D) D+14.6
2020 John W Hickenlooper (D) D+9.3
2016 Michael F. Bennet (D) D+5.7
2014 Cory Gardner (R) R+1.9
2010 Michael F. Bennet (D) D+1.6
2008 Mark Udall (D) D+10.3
2004 Ken Salazar (D) D+4.8
2002 Wayne Allard (R) R+4.9
1998 Ben Nighthorse Campbell (R) R+27.5
1996 Wayne Allard (R) R+5.7
1992 Ben Nighthorse Campbell (D) D+9.1
1990 Hank Brown (R) R+14.0
1986 Timothy E. Wirth (D) D+1.6
1984 William L. Armstrong (R) R+29.6
1980 Gary Hart (D) D+1.6
1978 William L. Armstrong (R) R+18.4
1974 Gary Hart (D) D+17.7
1972 Floyd K. Haskell (D) D+1.0
1968 Peter H. Dominick (R) R+17.1
1966 Gordon Allott (R) R+16.1
1962 Peter H. Dominick (R) R+8.0
1960 Gordon Allott (R) R+7.5
1956 John A. Carroll (D) D+0.4
1954 Gordon Allott (R) R+2.6
1950 Eugene D. Millikin (R) R+6.5
1948 Edwin C. Johnson (D) D+34.4
1944 Eugene Millikin (R) R+12.7
1942 Edwin C. Johnson (D) D+1.0
1938 Alva B. Adams (D) D+18.1
1936 Edwin C. Johnson (D) D+28.2
1932 Alva B. Adams (D) D+6.4
1930 Edward P. Costigan (D) D+13.2
1926 Charles W. Waterman (R) R+3.9
1924 Lawrence C. Phipps (R) R+6.3
1920 Samuel D. Nicholson (R) R+15.2
1918 Lawrence C. Phipps (R) R+1.6
1914 Charles S. Thomas (D) D+1.3