Boulder County, CO

CO · Presidential Elections 1880–2024

D+55.7
2024 Margin
R+0.8%
2020→2024 Swing
D since 1988
Voting Streak
329K
Population

Boulder County, CO (Colorado) voted D+55.7 for Kamala Harris (Democrat) in the 2024 presidential election, with Harris receiving 150,149 votes (76.49%) to 40,758 (20.76%) for Trump.

This represents a R+0.8% swing toward Republicans compared to 2020. Boulder County is classified as a deep Democratic county. Boulder County has voted Democratic in every presidential election since 1988. The county has a population of approximately 328,961.

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Quick Stats

2024 ResultD+55.7
2020→2024 SwingR+0.8%
Voting StreakD since 1988
Elections on Record37

Demographics

Population328,961
Median Age
37.7(US: 38.7)
College (BA+)
64.2%(US: 35.2%)
Median Income
$103,994(US: $80k)
White (non-Hisp)
75.3%(US: 57.6%)
Hispanic
14.7%(US: 19.1%)
Black
1.0%(US: 12.2%)
Asian
4.6%(US: 5.7%)
Homeownership
62.0%(US: 64.5%)
Poverty Rate
11.2%(US: 12.3%)
Veterans
4.3%(US: 6.2%)
Non-English (CVAP)
10.1%(US: 17.0%)
Source: Census ACS 5-Year (2020-2024)

Community Profile

Religious Composition

Source: Religion Census 2020
Catholic
16.0%
Evangelical
12.7%
Mainline Protestant
3.4%
LDS/Mormon
0.8%
Jewish
0.3%

Ancestry Groups

Source: Census ACS

Top reported ancestry groups (compared to national average).

German
18.1%(1.5x)
English
15.2%Above Average(1.7x)
Irish
12.7%(1.4x)
Mexican
9.9%
Italian
5.3%
Polish
3.1%(1.2x)
+ 4 more reported ancestry groups

Age Distribution

Median:37.7 yrs(US: 38.5)
Under 18
17.5%↓
18-29
15.4%
30-44
19.9%
45-64
30.8%↑
65+
16.4%
National average

Employment by Industry

Census ACS
Professional & TechnicalRegional Strength
21.2%(1.8x US)
Educational Services
10.0%(1.2x US)
Retail Trade
9.9%
Manufacturing
9.8%
Construction
4.9%(0.7x US)
Healthcare & Social Services
4.2%
National average
+ 1 more sectors

Presidential Elections

Presidential Results

YearDemocratRepublicanMarginSwing
202476.5%(150,149)20.8%(40,758)D+55.7R+0.8
202077.2%(159,089)20.6%(42,501)D+56.6D+8.2
201670.3%(132,334)22.0%(41,396)D+48.3D+6.5
201269.7%(125,091)27.8%(49,981)D+41.8R+4.3
200872.3%(124,159)26.1%(44,904)D+46.1D+12.2
200466.3%(105,564)32.4%(51,586)D+33.9D+20.2
200050.1%(69,983)36.4%(50,873)D+13.7R+3.9
199652.2%(63,316)34.5%(41,922)D+17.6R+6.8
199250.9%(64,567)26.5%(33,553)D+24.5D+16.0
198853.4%(57,265)44.9%(48,174)D+8.5D+20.1

Source: Official state election returns via MIT Election Data + Science Lab

Presidential Margin Trend

Boulder County, CO • 1880–2024

D+R++60+40+200-20-40-601880188818961904191219201928193619441952196019681976198419922000200820162024
Democratic margin
Republican margin

Senate Elections

Senate Results

YearDemocratRepublicanMarginSwing
201468.6%(97,612)27.4%(38,931)D+41.2R+3.1
200870.5%(117,042)26.1%(43,375)D+44.4D+16.6
200262.4%(66,407)34.7%(36,911)D+27.7D+7.2
199658.4%(70,013)37.9%(45,419)D+20.5D+12.6
199053.0%(42,628)45.0%(36,232)D+8.0D+20.5
198443.1%(43,588)55.6%(56,288)R+12.5R+4.7
197845.7%(28,530)53.5%(33,417)R+7.8R+14.9
197252.7%(36,529)45.6%(31,630)D+7.1D+32.6
196637.2%(11,788)62.7%(19,885)R+25.5R+5.0
196039.6%(12,339)60.1%(18,742)R+20.5R+6.1

Source: Official state election returns via MIT Election Data + Science Lab

Governor Elections

Governor Results

YearDemocratRepublicanMarginSwing
202280.1%(132,173)18.4%(30,454)D+61.6D+7.9
201875.5%(133,116)21.8%(38,423)D+53.7D+11.6
201468.1%(96,565)26.0%(36,868)D+42.1R+22.5
201070.0%(87,878)5.4%(6,772)D+64.6D+19.6
200671.2%(84,235)26.2%(30,974)D+45.0D+41.4
200247.8%(50,829)44.1%(46,964)D+3.6R+18.9
199860.0%(63,185)37.5%(39,487)D+22.5R+18.6
199467.4%(60,182)26.4%(23,529)D+41.1R+5.1
199071.7%(56,126)25.5%(19,986)D+46.1D+17.0
198664.3%(53,291)35.2%(29,143)D+29.1R+16.5

Source: Official state election returns via MIT Election Data + Science Lab

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