Boulder County, Colorado

2024 results by precinct

190 precincts · 196,304 votes cast

Harris · D+56

Harris +50

Trump +50

Real precinct boundaries. Hover for vote totals.

38 presidential elections

Year	Won	Margin	Democratic	Republican	Total
2024	D	+55.7%	150,149	40,758	196,304
2020	D	+56.6%	159,089	42,501	206,111
2016	D	+48.3%	132,334	41,396	188,145
2012	D	+41.8%	125,091	49,981	179,499
2008	D	+46.1%	124,159	44,904	171,763
2004	D	+33.9%	105,564	51,586	159,259
2000	D	+13.7%	69,983	50,873	139,626
1996	D	+17.6%	63,316	41,922	121,354
1992	D	+24.5%	64,567	33,553	126,771
1988	D	+8.5%	57,265	48,174	107,223
1984	R	−11.7%	42,195	53,535	97,223
1980	R	−14.1%	28,422	40,698	87,069
1976	R	−11.7%	33,284	42,830	81,253
1972	R	−15.7%	29,484	40,766	71,770
1968	R	−21.4%	17,422	27,671	47,988
1964	D	+13.3%	22,737	17,373	40,330
1960	R	−23.3%	12,276	19,791	32,197
1956	R	−34.3%	8,149	16,748	25,039
1952	R	−31.6%	7,767	15,069	23,079
1948	R	−7.8%	8,792	10,335	19,839
1944	R	−14.8%	7,442	10,054	17,610
1940	R	−7.5%	9,039	10,525	19,776
1936	D	+14.5%	9,788	7,244	17,501
1932	D	+5.5%	8,412	7,487	16,707
1928	R	−36.3%	4,363	9,457	14,015
1924	R	−33.4%	3,273	7,595	12,927
1920	R	−20.2%	4,200	6,456	11,148
1916	D	+28.4%	7,419	3,986	12,071
1912	D	+17.7%	4,330	2,445	10,620
1908	D	+7.9%	5,772	4,856	11,629
1904	R	−14.3%	4,030	5,483	10,172
1900	D	+15.2%	5,117	3,719	9,168
1896	D	+69.5%	6,046	1,033	7,209
1892	R	−36.4%	0	1,338	3,674
1888	R	−15.5%	1,176	1,639	2,981
1884	R	−17.5%	954	1,445	2,801
1880	R	−21.5%	796	1,313	2,402
1876	—	No data	—	—	—

Demographics

Race, ethnicity, and ancestry

Click any group to see the ancestries typically reported within it.

American

100.0%

Sample size too small to break out by ancestry reliably.

Multiple ancestry combinations reported; no single grouping above 1%.

American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.

Source · American Community Survey 5-year estimates, 2024 release. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.

Age distribution by sex

Median age: 37.7 in this county, 39.1 nationally

Male

Age

Female

0.7%

85+

1.2%

2.0%

75–84

2.4%

4.8%

65–74

5.2%

5.9%

55–64

6.1%

6.3%

45–54

6.2%

6.5%

35–44

6.1%

7.3%

25–34

6.3%

7.9%

18–24

7.5%

7.0%

5–17

6.7%

2.0%

1.9%

Source · American Community Survey 5-year estimates, 2024 release.

Median household income

2024 inflation-adjusted dollars

$103,994

Boulder County ranks in the top 5% of US counties.

Boulder County$103,994

Colorado$95,470

United States$80,734

Source · American Community Survey 5-year estimates, 2024 release.

Poverty rate

All persons below federal poverty line

11.2%

Children face moderate poverty.

Children under 1818.0%

Working age (18–64)100.0%

Seniors (65+)18.0%

Source · American Community Survey 5-year estimates, 2024 release.

Language at home

Population aged 5 and older

0.0%

speak English only

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Catholic & Orthodox

16.2%

Other Christian

12.4%

Mainline Protestant

3.4%

Non-Christian

2.9%

Methodist

0.7%

Pentecostal & Holiness

0.5%

Baptist

0.3%

Source · 2020 US Religion Census. Remaining 63.6% of residents not counted as adherents by any reporting body.

Boulder County's D+55.8 margin in 2024 makes it an outlier even among Front Range urban counties, driven by a dense concentration of university employment, graduate-degree holders, and white-collar tech workers clustered around CU Boulder.

The unraveling was not abrupt. The Democratic margin in Boulder County peaked at seventy points in 1896; it narrowed steadily over the late twentieth century. The 1988 election delivered the county to the Republican party for the first time in many years, by a margin of eight points. By 2024, the margin had widened further.

The economic and demographic context is severe. Boulder County's median household income of $103,994 is among the lowest of any county in the United States; 11% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of San Juan County and Benton County.

Most similar counties

For forty-four years, Boulder County voted Republican. Then it stopped.