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Boulder County, CO


Metropolitan Statistical Area: Boulder, CO
Designated Market Area: Denver, CO-NE-WY
American Communities Project County Type (2023): College Towns

Places in Boulder County, CO     [Sort places by name]

 

Tracts in Boulder County, CO

   



Click here to view demographic data for Boulder County, CO

2022 population: 327,468   ( 32,901 from 2010 , 3,296 from 2020)
Land area: 726.4 square miles
Population density: 450.8 persons per square mile

2022 Census data
White:251,865 76.91% 7.8%
Black:3,4541.05% 52.5%
Indian:1,3130.40% 23.8%
Asian:16,6115.07% 36.7%
2+ races:8,1952.50% 46.4%
Hispanic:46,03014.06% 17.2%
Total non-White:75,60323.09% 24.3%

2020-2022 ComponentsNumberRate
Births:5,633 8.5
Deaths:4,9737.5
Net Migration: -4,985-7.5
Net Immigration: 1,2471.9
Change in White population:18,124 6.2
Change in Non-White pop.:14,777 5.0



Historical Presidential Election Results for Boulder County, CO

Recent Trends
VotesΔ MarginSwing %
2020 vs. 2016 R +1,105 D +25,650 D + 5.5%
D +26,755
2020 vs. 2012 R -7,480 D +41,478 D + 14.9%
D +33,998
2020 vs. 2008 R -2,403 D +37,333 D + 11.0%
D +34,930
2016 vs. 2008 R -3,508 D +11,683 D + 5.5%
D +8,175
How to interpret this table


Click on the Year to view county-level data for that election.

YearTurnout WinnerRunner-Up OtherTotal Votes Diff
(St) 		Diff
(US) 		PSV
2020 77% Joe Biden (D) 159,089 77.2% Donald Trump* (R) 42,501 20.6% 4,521 [+] 2.2% 206,111 -21 -26 6.33%
2016 74% Hillary Clinton (D) 132,334 70.3% Donald Trump (R) 41,396 22.0% 14,415 [+] 7.7% 188,145 -21 -24 6.77%
2012 75% Barack Obama* (D) 125,091 69.7% Mitt Romney (R) 49,981 27.8% 4,427 [+] 2.5% 179,499 -18 -19 6.98%
2008 75% Barack Obama (D) 124,159 72.3% John McCain (R) 44,904 26.1% 2,700 [+] 1.6% 171,763 -19 -19 7.15%
2004 70% John Kerry (D) 105,564 66.3% George W. Bush* (R) 51,586 32.4% 2,109 [+] 1.3% 159,259 -19 -18 7.48%
2000 62% Albert Gore, Jr. (D) 69,983 50.1% George W. Bush (R) 50,873 36.4% 18,770 [+] 13.4% 139,626 -14 -11 8.02%
1996 59% Bill Clinton* (D) 63,316 52.2% Robert Dole (R) 41,922 34.5% 16,116 [+] 13.3% 121,354 -11 -6 8.03%
1992 69% Bill Clinton (D) 64,567 50.9% George Bush* (R) 33,553 26.5% 28,651 [+] 22.6% 126,771 -9 -11 8.08%
1988 64% Michael Dukakis (D) 57,265 53.4% George Bush (R) 48,174 44.9% 1,784 [+] 1.7% 107,223 -8 -8 7.81%
1984 63% Ronald Reagan* (R) 53,535 55.1% Walter Mondale (D) 42,195 43.4% 1,493 1.5% 97,223 -8 -4 7.51%
1980 61% Ronald Reagan (R) 40,698 46.9% Jimmy Carter* (D) 28,422 32.7% 17,679 [+] 20.4% 86,799 -8 -4 7.33%
1976 69% Gerald Ford* (R) 42,830 52.7% Jimmy Carter (D) 33,284 41.0% 5,139 [+] 6.3% 81,253 -1 5 7.51%
1972 71% Richard Nixon* (R) 40,766 56.8% George McGovern (D) 29,484 41.1% 1,520 [+] 2.1% 71,770 -6 -4 7.52%
1968 65% Richard Nixon (R) 27,671 57.6% Hubert Humphrey (D) 17,422 36.2% 2,986 [+] 6.2% 48,079 7 14 5.93%
1964 67% Lyndon Johnson* (D) 22,737 56.4% Barry Goldwater (R) 17,373 43.1% 220 0.5% 40,330 5 5 5.19%
1960 70% Richard Nixon (R) 19,791 61.5% John Kennedy (D) 12,276 38.1% 130 0.4% 32,197 7 12 4.37%
1956 60% Dwight Eisenhower* (R) 16,748 66.9% Adlai Stevenson (D) 8,149 32.5% 142 0.6% 25,039 7 9 3.81%
1952 66% Dwight Eisenhower (R) 15,069 65.3% Adlai Stevenson (D) 7,767 33.7% 243 1.1% 23,079 5 10 3.66%
1948 66% Thomas Dewey (R) 10,335 52.1% Harry Truman* (D) 8,792 44.3% 712 [+] 3.6% 19,839 6 7 3.85%
1944 65% Thomas Dewey (R) 10,054 57.1% Franklin Roosevelt* (D) 7,442 42.3% 114 0.6% 17,610 4 11 3.49%
1940 81% Wendell Willkie (R) 10,525 53.2% Franklin Roosevelt* (D) 9,039 45.7% 212 1.1% 19,776 2 8 3.60%
1936 80% Franklin Roosevelt* (D) 9,788 55.9% Alf Landon (R) 7,244 41.4% 469 [+] 2.7% 17,501 4 5 3.58%
1932 81% Franklin Roosevelt (D) 8,412 50.4% Herbert Hoover* (R) 7,487 44.8% 808 [+] 4.8% 16,707 3 5 3.65%
1928 71% Herbert Hoover (R) 9,457 67.5% Al Smith (D) 4,363 31.1% 195 [+] 1.4% 14,015 3 9 3.57%
1924 66% Calvin Coolidge (R) 7,595 58.8% John Davis (D) 3,273 25.3% 2,059 [+] 15.9% 12,927 2 5 3.78%
1920 57% Warren Harding (R) 6,456 57.9% James Cox (D) 4,200 37.7% 492 [+] 4.4% 11,148 -1 -2 3.82%
1916 60% Woodrow Wilson* (D) 7,419 61.5% Charles Evans Hughes (R) 3,986 33.0% 666 [+] 5.5% 12,071 -2 -13 4.10%
1912 54% Woodrow Wilson (D) 4,330 40.8% Theodore Roosevelt (Prog) 2,469 23.2% 3,821 [+] 36.0% 10,620 1 0 3.98%
1908 63% William J. Bryan (D) 5,772 49.7% William Taft (R) 4,856 41.8% 991 [+] 8.5% 11,619 -5 -10 4.40%
1904 63% Theodore Roosevelt (R) 5,483 53.9% Alton Parker (D) 4,030 39.6% 659 [+] 6.5% 10,172 -1 -2 4.17%
1900 66% William J. Bryan (D) 5,117 55.8% William McKinley* (R) 3,719 40.6% 332 [+] 3.6% 9,168 -1 -11 4.15%
* incumbent         PSV: percent of state vote



2020 President, Boulder County, CO
CandidateVotesPct
Joe Biden (D) 159,089 77.2%
Donald Trump* (R) 42,501 20.6%
Jo Jorgensen (Lbt) 2,539 1.2%
Other 1,982 1.0%
TOTAL 206,111
Turnout: 77% Diff (St): -21 Diff (US): -26


2016 President, Boulder County, CO
CandidateVotesPct
Hillary Clinton (D) 132,334 70.3%
Donald Trump (R) 41,396 22.0%
Gary Johnson (Lbt) 8,034 4.3%
Jill Stein (Grn) 3,733 2.0%
Evan McMullin (I) 1,473 0.8%
Other 1,175 0.6%
TOTAL 188,145
Turnout: 74% Diff (St): -21 Diff (US): -24


2012 President, Boulder County, CO
CandidateVotesPct
Barack Obama* (D) 125,091 69.7%
Mitt Romney (R) 49,981 27.8%
Gary Johnson (Lbt) 2,794 1.6%
Other 1,633 0.9%
TOTAL 179,499
Turnout: 75% Diff (St): -18 Diff (US): -19


2008 President, Boulder County, CO
CandidateVotesPct
Barack Obama (D) 124,159 72.3%
John McCain (R) 44,904 26.1%
Ralph Nader (I) 852 0.5%
Bob Barr (Lbt) 928 0.5%
Other 920 0.5%
TOTAL 171,763
Turnout: 75% Diff (St): -19 Diff (US): -19


2004 President, Boulder County, CO
CandidateVotesPct
George W. Bush* (R) 51,586 32.4%
John Kerry (D) 105,564 66.3%
Ralph Nader (I) 964 0.6%
Other 1,145 0.7%
TOTAL 159,259
Turnout: 70% Diff (St): -19 Diff (US): -18


2000 President, Boulder County, CO
CandidateVotesPct
George W. Bush (R) 50,873 36.4%
Albert Gore, Jr. (D) 69,983 50.1%
Ralph Nader (Grn) 16,498 11.8%
Pat Buchanan (Ref) 477 0.3%
Other 1,795 1.3%
TOTAL 139,626
Turnout: 62% Diff (St): -14 Diff (US): -11


1996 President, Boulder County, CO
CandidateVotesPct
Bill Clinton* (D) 63,316 52.2%
Robert Dole (R) 41,922 34.5%
Ross Perot (Ref) 6,840 5.6%
Ralph Nader (Grn) 6,772 5.6%
Harry Browne (Lbt) 1,469 1.2%
Other 1,035 0.9%
TOTAL 121,354
Turnout: 59% Diff (St): -11 Diff (US): -6


1992 President, Boulder County, CO
CandidateVotesPct
Bill Clinton (D) 64,567 50.9%
George Bush* (R) 33,553 26.5%
Ross Perot (I) 27,762 21.9%
Other 889 0.7%
TOTAL 126,771
Turnout: 69% Diff (St): -9 Diff (US): -11


1988 President, Boulder County, CO
CandidateVotesPct
George Bush (R) 48,174 44.9%
Michael Dukakis (D) 57,265 53.4%
Ron Paul (Lbt) 1,463 1.4%
Other 321 0.3%
TOTAL 107,223
Turnout: 64% Diff (St): -8 Diff (US): -8


1984 President, Boulder County, CO
CandidateVotesPct
Ronald Reagan* (R) 53,535 55.1%
Walter Mondale (D) 42,195 43.4%
Other 1,493 1.5%
TOTAL 97,223
Turnout: 63% Diff (St): -8 Diff (US): -4


1980 President, Boulder County, CO
CandidateVotesPct
Ronald Reagan (R) 40,698 46.9%
Jimmy Carter* (D) 28,422 32.7%
John Anderson (I) 13,712 15.8%
Edward Clark (Lbt) 2,360 2.7%
Other 1,607 1.9%
TOTAL 86,799
Turnout: 61% Diff (St): -8 Diff (US): -4


1976 President, Boulder County, CO
CandidateVotesPct
Jimmy Carter (D) 33,284 41.0%
Gerald Ford* (R) 42,830 52.7%
Eugene McCarthy (I) 4,252 5.2%
Other 887 1.1%
TOTAL 81,253
Turnout: 69% Diff (St): -1 Diff (US): 5


1972 President, Boulder County, CO
CandidateVotesPct
Richard Nixon* (R) 40,766 56.8%
George McGovern (D) 29,484 41.1%
John Schmitz (Amer) 837 1.2%
Other 683 1.0%
TOTAL 71,770
Turnout: 71% Diff (St): -6 Diff (US): -4


1968 President, Boulder County, CO
CandidateVotesPct
Richard Nixon (R) 27,671 57.6%
Hubert Humphrey (D) 17,422 36.2%
George Wallace (AIP) 2,497 5.2%
Other 489 1.0%
TOTAL 48,079
Turnout: 65% Diff (St): 7 Diff (US): 14


1964 President, Boulder County, CO
CandidateVotesPct
Lyndon Johnson* (D) 22,737 56.4%
Barry Goldwater (R) 17,373 43.1%
Other 220 0.5%
TOTAL 40,330
Turnout: 67% Diff (St): 5 Diff (US): 5


1960 President, Boulder County, CO
CandidateVotesPct
John Kennedy (D) 12,276 38.1%
Richard Nixon (R) 19,791 61.5%
Other 130 0.4%
TOTAL 32,197
Turnout: 70% Diff (St): 7 Diff (US): 12


1956 President, Boulder County, CO
CandidateVotesPct
Dwight Eisenhower* (R) 16,748 66.9%
Adlai Stevenson (D) 8,149 32.5%
Other 142 0.6%
TOTAL 25,039
Turnout: 60% Diff (St): 7 Diff (US): 9


1952 President, Boulder County, CO
CandidateVotesPct
Dwight Eisenhower (R) 15,069 65.3%
Adlai Stevenson (D) 7,767 33.7%
Other 243 1.1%
TOTAL 23,079
Turnout: 66% Diff (St): 5 Diff (US): 10


1948 President, Boulder County, CO
CandidateVotesPct
Harry Truman* (D) 8,792 44.3%
Thomas Dewey (R) 10,335 52.1%
Henry Wallace (Prog) 488 2.5%
Other 224 1.1%
TOTAL 19,839
Turnout: 66% Diff (St): 6 Diff (US): 7


1944 President, Boulder County, CO
CandidateVotesPct
Franklin Roosevelt* (D) 7,442 42.3%
Thomas Dewey (R) 10,054 57.1%
Other 114 0.6%
TOTAL 17,610
Turnout: 65% Diff (St): 4 Diff (US): 11


1940 President, Boulder County, CO
CandidateVotesPct
Franklin Roosevelt* (D) 9,039 45.7%
Wendell Willkie (R) 10,525 53.2%
Other 212 1.1%
TOTAL 19,776
Turnout: 81% Diff (St): 2 Diff (US): 8


1936 President, Boulder County, CO
CandidateVotesPct
Franklin Roosevelt* (D) 9,788 55.9%
Alf Landon (R) 7,244 41.4%
William Lemke (Union) 354 2.0%
Norman Thomas (Soc) 103 0.6%
Other 12 0.1%
TOTAL 17,501
Turnout: 80% Diff (St): 4 Diff (US): 5


1932 President, Boulder County, CO
CandidateVotesPct
Franklin Roosevelt (D) 8,412 50.4%
Herbert Hoover* (R) 7,487 44.8%
Norman Thomas (Soc) 720 4.3%
Other 88 0.5%
TOTAL 16,707
Turnout: 81% Diff (St): 3 Diff (US): 5


1928 President, Boulder County, CO
CandidateVotesPct
Herbert Hoover (R) 9,457 67.5%
Al Smith (D) 4,363 31.1%
Norman Thomas (Soc) 129 0.9%
Other 66 0.5%
TOTAL 14,015
Turnout: 71% Diff (St): 3 Diff (US): 9


1924 President, Boulder County, CO
CandidateVotesPct
Calvin Coolidge (R) 7,595 58.8%
John Davis (D) 3,273 25.3%
Robert LaFollette (Prog) 2,007 15.5%
Other 52 0.4%
TOTAL 12,927
Turnout: 66% Diff (St): 2 Diff (US): 5


1920 President, Boulder County, CO
CandidateVotesPct
Warren Harding (R) 6,456 57.9%
James Cox (D) 4,200 37.7%
Eugene Debs (Soc) 294 2.6%
Parley Christiansen (FL) 73 0.7%
Aaron Watkins (Proh) 125 1.1%
TOTAL 11,148
Turnout: 57% Diff (St): -1 Diff (US): -2


1916 President, Boulder County, CO
CandidateVotesPct
Woodrow Wilson* (D) 7,419 61.5%
Charles Evans Hughes (R) 3,986 33.0%
Allan Benson (Soc) 482 4.0%
James Hanly (Proh) 163 1.4%
Other 21 0.2%
TOTAL 12,071
Turnout: 60% Diff (St): -2 Diff (US): -13


1912 President, Boulder County, CO
CandidateVotesPct
Woodrow Wilson (D) 4,330 40.8%
Theodore Roosevelt (Prog) 2,469 23.2%
William Taft* (R) 2,445 23.0%
Eugene Debs (Soc) 918 8.6%
Eugene Chafin (Proh) 453 4.3%
Other 5 0.0%
TOTAL 10,620
Turnout: 54% Diff (St): 1 Diff (US): 0


1908 President, Boulder County, CO
CandidateVotesPct
William Taft (R) 4,856 41.8%
William J. Bryan (D) 5,772 49.7%
Eugene Debs (Soc) 498 4.3%
Eugene Chafin (Proh) 493 4.2%
TOTAL 11,619
Turnout: 63% Diff (St): -5 Diff (US): -10


1904 President, Boulder County, CO
CandidateVotesPct
Theodore Roosevelt (R) 5,483 53.9%
Alton Parker (D) 4,030 39.6%
Other 659 6.5%
TOTAL 10,172
Turnout: 63% Diff (St): -1 Diff (US): -2


1900 President, Boulder County, CO
CandidateVotesPct
William McKinley* (R) 3,719 40.6%
William J. Bryan (D) 5,117 55.8%
Other 332 3.6%
TOTAL 9,168
Turnout: 66% Diff (St): -1 Diff (US): -11
* incumbent

Historical Statewide Election Results for Boulder County, CO

Click on the Year to view county-level data for that election.

YearTypeTurnout WinnerRunner-Up OtherTotal VotesDiff PSV
2022 S3 62% Michael Bennet* (D) 128,227 77.5% Joe O'Dea (R) 33,858 20.5% 3,343 [+] 2.0% 165,428 -21 6.62%
2022 G 62% Jared Polis* (D) 132,173 80.1% Heidi Ganahl (R) 30,454 18.4% 2,449 [+] 1.5% 165,076 -21 6.58%
2020 S2 77% John Hickenlooper (D) 154,552 75.2% Cory Gardner* (R) 47,321 23.0% 3,643 [+] 1.8% 205,516 -21 6.35%
2018 G 68% Jared Polis (D) 133,116 75.5% Walker Stapleton (R) 38,423 21.8% 4,723 [+] 2.7% 176,262 -21 6.98%
2016 S3 73% Michael Bennet* (D) 126,334 68.0% Darryl Glenn (R) 45,755 24.6% 13,731 [+] 7.4% 185,820 -20 6.77%
2014 S2 58% Mark Udall* (D) 97,612 68.6% Cory Gardner (R) 38,931 27.4% 5,778 [+] 4.1% 142,321 -21 6.97%
2014 G 58% John Hickenlooper* (D) 96,565 68.1% Bob Beauprez (R) 36,868 26.0% 8,327 [+] 5.9% 141,760 -20 6.94%
2010 S3 54% Michael Bennet* (D) 84,264 67.3% Ken Buck (R) 35,450 28.3% 5,551 [+] 4.4% 125,265 -18 7.07%
2010 G 54% John Hickenlooper (D) 87,878 70.0% Tom Tancredo (I) 29,368 23.4% 8,240 [+] 6.6% 125,486 -6 7.02%
2008 S2 72% Mark Udall (D) 117,042 70.5% Bob Schaffer (R) 43,375 26.1% 5,679 [+] 3.4% 166,096 -16 7.12%
2006 G 52% Bill Ritter* (D) 84,235 71.2% Bob Beauprez (R) 30,974 26.2% 3,122 [+] 2.6% 118,331 -14 7.59%
2004 S3 69% Ken Salazar (D) 106,481 67.6% Pete Coors (R) 47,899 30.4% 3,034 [+] 1.9% 157,414 -16 7.47%
2002 S2 47% Tom Strickland (D) 66,407 62.4% Wayne Allard* (R) 36,911 34.7% 3,115 [+] 2.9% 106,433 -16 7.52%
2002 G 47% Rollie Heath (D) 50,829 47.8% Bill Owens* (R) 46,964 44.1% 8,643 [+] 8.1% 106,436 -18 7.53%
1998 S3 49% Dottie Lamm (D) 53,267 50.4% Ben Nighthorse Campbell* (R) 49,457 46.8% 3,047 [+] 2.9% 105,771 -16 7.97%
1998 G 49% Gail Schoettler (D) 63,185 60.0% Bill Owens (R) 39,487 37.5% 2,681 [+] 2.5% 105,353 -12 7.97%
1996 S2 59% Tom Strickland (D) 70,013 58.4% Wayne Allard (R) 45,419 37.9% 4,358 [+] 3.6% 119,790 -13 8.15%
1994 G 46% Roy Romer* (D) 60,182 67.4% Bruce Benson (R) 23,529 26.4% 5,561 [+] 6.2% 89,272 -12 8.00%
1992 S3 70% Ben Nighthorse Campbell (D) 79,437 61.9% Terry Considine (R) 41,118 32.0% 7,804 [+] 6.1% 128,359 -11 8.27%
1990 S2 46% Josie Heath (D) 42,628 53.0% Hank Brown (R) 36,232 45.0% 1,587 [+] 2.0% 80,447 -11 7.87%
1990 G 45% Roy Romer* (D) 56,126 71.5% John Andrews (R) 19,986 25.5% 2,395 [+] 3.1% 78,507 -10 7.76%
1986 S3 52% Tim Wirth (D) 50,425 60.4% Ken Kramer (R) 32,078 38.4% 1,021 [+] 1.2% 83,524 -10 7.87%
1986 G 51% Roy Romer (D) 53,291 64.3% Ted Strickland (R) 29,143 35.2% 428 [+] 0.5% 82,862 -6 7.83%
1984 S2 65% William Armstrong* (R) 56,288 55.6% Nancy Dick (D) 43,588 43.1% 1,325 [+] 1.3% 101,201 -9 7.80%
1982 G 50% Richard Lamm* (D) 52,672 71.4% John Fuhr (R) 19,004 25.8% 2,090 [+] 2.8% 73,766 -6 7.72%
1980 S3 64% Gary Hart* (D) 51,770 56.9% Mary Buchanan (R) 38,608 42.4% 663 [+] 0.7% 91,041 -6 7.76%
1978 S2 50% William Armstrong (R) 33,417 53.5% Floyd Haskell* (D) 28,530 45.7% 471 [+] 0.8% 62,418 -5 7.62%
1978 G 49% Richard Lamm* (D) 39,851 64.5% Ted Strickland (R) 20,467 33.1% 1,507 [+] 2.4% 61,825 -5 7.50%
1974 S3 56% Gary Hart (D) 37,529 60.9% Peter Dominick* (R) 22,299 36.2% 1,795 [+] 2.9% 61,623 -3 7.48%
1974 G 57% Richard Lamm (D) 35,600 57.3% John Vanderhoof* (R) 25,904 41.7% 653 [+] 1.1% 62,157 -4 7.50%
1972 S2 69% Floyd Haskell (D) 36,529 52.7% Gordon Allott* (R) 31,630 45.6% 1,199 [+] 1.7% 69,358 -3 7.49%
1970 G 47% John Love* (R) 23,617 57.9% Mark Hogan (D) 16,299 40.0% 874 [+] 2.1% 40,790 5 6.10%
1968 S3 62% Peter Dominick* (R) 29,564 64.5% Stephen McNichols (D) 16,281 35.5% 0 0.0% 45,845 6 5.84%
1966 S2 47% Gordon Allott* (R) 19,885 62.7% Roy Romer (D) 11,788 37.2% 53 [+] 0.2% 31,726 5 5.00%
1966 G 49% John Love* (R) 21,275 64.1% Robert Knous (D) 11,458 34.5% 452 [+] 1.4% 33,185 10 5.03%
1962 S3 53% Peter Dominick (R) 16,503 58.9% John Carroll* (D) 11,320 40.4% 172 [+] 0.6% 27,995 5 4.56%
1962 G 54% John Love (R) 16,756 59.1% Stephen McNichols* (D) 11,495 40.5% 112 [+] 0.4% 28,363 2 4.60%
1960 S2 68% Gordon Allott* (R) 18,742 60.1% Robert Knous (D) 12,339 39.6% 105 [+] 0.3% 31,186 7 4.29%
*: incumbent               +: ran on additional party lines               Type: G: Governor; S1,S2,S3: Senate Class 1, 2 or 3
italics: special election           RO: runoff election           PSV: percent of state vote


Historical U.S. House Election Results for Boulder County, CO

Click on the District to view county-level data for that election (where available).

DateDistrictWinnerRunner-Up OtherTotal Votes
2022-11-08 CO02Joe Neguse* (D) 128,480 78.4% Marshall Dawson (R) 32,635 19.9% 2,846 1.7% 163,961
County Total for 2022-11-08:   163,961
2020-11-03 CO02Joe Neguse* (D) 114,509 79.4% Charlie Winn (R) 26,505 18.4% 3,260 2.3% 144,274
2020-11-03 CO04Ike McCorkle (D) 35,540 62.8% Ken Buck* (R) 19,184 33.9% 1,905 3.4% 56,629
County Total for 2020-11-03:   200,903
2018-11-06 CO02Joe Neguse (D) 100,066 77.8% Peter Yu (R) 22,169 17.2% 6,367 5.0% 128,602
2018-11-06 CO04Karen McCormick (D) 30,005 65.3% Ken Buck* (R) 15,947 34.7% 5 0.0% 45,957
County Total for 2018-11-06:   174,559
2016-11-08 CO02Jared Polis* (D) 101,137 75.2% Nicholas Morse (R) 27,388 20.4% 6,054 4.5% 134,579
2016-11-08 CO04Bob Seay (D) 25,600 53.3% Ken Buck* (R) 19,774 41.2% 2,618 5.5% 47,992
County Total for 2016-11-08:   182,571
2014-11-04 CO02Jared Polis* (D) 77,589 75.3% George Leing (R) 25,433 24.7% 0 0.0% 103,022
2014-11-04 CO04Vic Meyers (D) 17,823 49.2% Ken Buck (R) 15,848 43.8% 2,546 7.0% 36,217
County Total for 2014-11-04:   139,239
2012-11-06 CO02Jared Polis* (D) 93,758 73.1% Kevin Lundberg (R) 27,623 21.5% 6,856 5.3% 128,237
2012-11-06 CO04Brandon Shaffer (D) 25,321 57.0% Cory Gardner* (R) 16,875 38.0% 2,193 4.9% 44,389
County Total for 2012-11-06:   172,626
2010-11-02 CO02Jared Polis* (D) 67,199 73.4% Stephen Bailey (R) 21,655 23.6% 2,712 3.0% 91,566
2010-11-02 CO04Betsy Markey* (D) 17,058 51.2% Cory Gardner (R) 14,411 43.3% 1,827 5.5% 33,296
County Total for 2010-11-02:   124,862
2008-11-04 CO02Jared Polis (D) 88,981 73.8% Scott Starin (R) 27,366 22.7% 4,229 3.5% 120,576
2008-11-04 CO04Betsy Markey (D) 26,713 63.3% Marilyn Musgrave* (R) 15,477 36.7% 0 0.0% 42,190
County Total for 2008-11-04:   162,766
2006-11-07 CO02Mark Udall* (D) 68,375 78.1% Rich Mancuso (R) 15,988 18.3% 3,215 3.7% 87,578
2006-11-07 CO04Angie Paccione (D) 15,123 49.9% Marilyn Musgrave* (R) 12,258 40.5% 2,896 9.6% 30,277
County Total for 2006-11-07:   117,855
2004-11-02 CO02Mark Udall* (D) 88,487 77.0% Stephen Hackman (R) 23,583 20.5% 2,915 2.5% 114,985
2004-11-02 CO04Stan Matsunaka (D) 18,771 49.2% Marilyn Musgrave* (R) 17,775 46.6% 1,631 4.3% 38,177
County Total for 2004-11-02:   153,162
2002-11-05 CO02Mark Udall* (D) 55,476 69.4% Sandy Hume (R) 22,170 27.7% 2,348 2.9% 79,994
2002-11-05 CO04Marilyn Musgrave (R) 13,248 50.9% Stan Matsunaka (D) 11,673 44.9% 1,087 4.2% 26,008
County Total for 2002-11-05:   106,002
2000-11-07 CO02Mark Udall (D) 74,415 57.0% Carolyn Cox (R) 43,628 33.4% 12,460 9.5% 130,503
County Total for 2000-11-07:   130,503
1998-11-03 CO02Mark Udall (D) 59,066 56.2% Bob Greenlee (R) 43,745 41.6% 2,231 2.1% 105,042
County Total for 1998-11-03:   105,042
1996-11-05 CO02David Skaggs* (D) 75,129 62.7% Patricia Miller (R) 38,271 31.9% 6,395 5.3% 119,795
County Total for 1996-11-05:   119,795
1994-11-08 CO02David Skaggs* (D) 53,695 61.6% Patricia Miller (R) 33,423 38.3% 44 0.1% 87,162
County Total for 1994-11-08:   87,162
1992-11-03 CO02David Skaggs* (D) 83,761 66.1% Bryan Day (R) 34,360 27.1% 8,629 6.8% 126,750
County Total for 1992-11-03:   126,750
*: incumbent           sp: special election           RO: runoff election

Voter Registration Data for Boulder County, CO

YearTotalRepublicanDemocratOtherR/D EdgeR/D Edge %VAPOP %
2023 249,651 27,420 11.0% 100,119 40.1% 122,112 48.9% Dem +72,699 Dem +29.1% 93%
2022 253,189 29,509 11.7% 103,609 40.9% 120,071 47.4% Dem +74,100 Dem +29.3% 95%
2020 252,949 33,894 13.4% 108,670 43.0% 110,385 43.6% Dem +74,776 Dem +29.6% 95%
2018 246,402 37,350 15.2% 105,469 42.8% 103,583 42.0% Dem +68,119 Dem +27.6% 95%
2016 261,237 44,971 17.2% 111,869 42.8% 104,397 40.0% Dem +66,898 Dem +25.6% 103%
2014 254,027 46,384 18.3% 101,655 40.0% 105,988 41.7% Dem +55,271 Dem +21.8% 103%
2012 248,887 47,473 19.1% 101,737 40.9% 99,677 40.0% Dem +54,264 Dem +21.8% 104%
2010 224,379 44,982 20.0% 93,553 41.7% 85,844 38.3% Dem +48,571 Dem +21.6% 97%
2008 218,006 44,377 20.4% 90,382 41.5% 83,247 38.2% Dem +46,005 Dem +21.1% 95%
2006 210,208 48,311 23.0% 77,481 36.9% 84,416 40.2% Dem +29,170 Dem +13.9% 92%
2004 218,459 52,919 24.2% 78,864 36.1% 86,676 39.7% Dem +25,945 Dem +11.9% 96%
2002 199,490 52,347 26.2% 68,986 34.6% 78,157 39.2% Dem +16,639 Dem +8.3% 88%
2000 212,397 57,334 27.0% 70,401 33.1% 84,662 39.9% Dem +13,067 Dem +6.2% 95%
1998 200,067 53,568 26.8% 67,308 33.6% 79,191 39.6% Dem +13,740 Dem +6.9% 93%
1996 186,562 50,959 27.3% 64,882 34.8% 70,721 37.9% Dem +13,923 Dem +7.5% 91%
1994 160,512 42,162 26.3% 57,702 35.9% 60,648 37.8% Dem +15,540 Dem +9.7% 83%
1992 157,074 41,668 26.5% 57,227 36.4% 58,179 37.0% Dem +15,559 Dem +9.9% 85%
1990 149,717 42,119 28.1% 46,195 30.9% 61,403 41.0% Dem +4,076 Dem +2.7% 86%
1988 157,571 43,797 27.8% 44,481 28.2% 69,293 44.0% Dem +684 Dem +0.4% 94%
1986 140,354 39,376 28.1% 39,229 28.0% 61,749 44.0% Rep +147 Rep +0.1% 87%
VAPOP% is the estimated percentage of voting age population that is registered.
Registration data may include "inactive" voters.   Data for each year pertains to the November elections.