Boulder County, Colorado: Diversifying Metro county. In 2024, voted D+56%. Democratic peak: D+70 in 1896.
Key facts
- 2024 presidential margin
- D+56MIT Election Lab
- Political typology
- Diversifying MetroAkashic typology
- Population
- 328,9612024 5-year
- Median household income
- $103,9942024 5-year
- White (non-Hispanic)
- 77.8%2024 5-year
- Black
- 0.8%2024 5-year
- Hispanic / Latino
- 14.7%2024 5-year
- Peak Democratic margin
- D+70 in 1896MIT Election Lab
- Peak Republican margin
- R+36 in 1892MIT Election Lab
- Most similar
- San Juan County, WA · similarity 1.00
2024 results by precinct
2024 precinct map of Boulder CountyPrecinct-level 2024 presidential results for Boulder County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | −21.5% |
| 1884 | −17.5% |
| 1888 | −15.5% |
| 1892 | −36.4% |
| 1896 | +69.5% |
| 1900 | +15.2% |
| 1904 | −14.3% |
| 1908 | +7.9% |
| 1912 | +17.7% |
| 1916 | +28.4% |
| 1920 | −20.2% |
| 1924 | −33.4% |
| 1928 | −36.3% |
| 1932 | +5.5% |
| 1936 | +14.5% |
| 1940 | −7.5% |
| 1944 | −14.8% |
| 1948 | −7.8% |
| 1952 | −31.6% |
| 1956 | −34.3% |
| 1960 | −23.3% |
| 1964 | +13.3% |
| 1968 | −21.4% |
| 1972 | −15.7% |
| 1976 | −11.7% |
| 1980 | −14.1% |
| 1984 | −11.7% |
| 1988 | +8.5% |
| 1992 | +24.5% |
| 1996 | +17.6% |
| 2000 | +13.7% |
| 2004 | +33.9% |
| 2008 | +46.1% |
| 2012 | +41.8% |
| 2016 | +48.3% |
| 2020 | +56.6% |
| 2024 | +55.7% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 150,149 | 40,758 | 196,304 | ||
| D | 159,089 | 42,501 | 206,111 | ||
| D | 132,334 | 41,396 | 188,145 | ||
| D | 125,091 | 49,981 | 179,499 | ||
| D | 124,159 | 44,904 | 171,763 | ||
| D | 105,564 | 51,586 | 159,259 | ||
| D | 69,983 | 50,873 | 139,626 | ||
| D | 63,316 | 41,922 | 121,354 | ||
| D | 64,567 | 33,553 | 126,771 | ||
| D | 57,265 | 48,174 | 107,223 | ||
| R | 42,195 | 53,535 | 97,223 | ||
| R | 28,422 | 40,698 | 87,069 | ||
| R | 33,284 | 42,830 | 81,253 | ||
| R | 29,484 | 40,766 | 71,770 | ||
| R | 17,422 | 27,671 | 47,988 | ||
| D | 22,737 | 17,373 | 40,330 | ||
| R | 12,276 | 19,791 | 32,197 | ||
| R | 8,149 | 16,748 | 25,039 | ||
| R | 7,767 | 15,069 | 23,079 | ||
| R | 8,792 | 10,335 | 19,839 | ||
| R | 7,442 | 10,054 | 17,610 | ||
| R | 9,039 | 10,525 | 19,776 | ||
| D | 9,788 | 7,244 | 17,501 | ||
| D | 8,412 | 7,487 | 16,707 | ||
| R | 4,363 | 9,457 | 14,015 | ||
| R | 3,273 | 7,595 | 12,927 | ||
| R | 4,200 | 6,456 | 11,148 | ||
| D | 7,419 | 3,986 | 12,071 | ||
| D | 4,330 | 2,445 | 10,620 | ||
| D | 5,772 | 4,856 | 11,629 | ||
| R | 4,030 | 5,483 | 10,172 | ||
| D | 5,117 | 3,719 | 9,168 | ||
| D | 6,046 | 1,033 | 7,209 | ||
| O | 0 | 1,338 | 3,674 | ||
| R | 1,176 | 1,639 | 2,981 | ||
| R | 954 | 1,445 | 2,801 | ||
| R | 796 | 1,313 | 2,402 | ||
| — | — | — | — |
Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
18.1%
English
15.1%
Irish
12.6%
Italian
5.3%
Polish
3.1%
American
3.0%
French
2.9%
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. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 37.7 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
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
Boulder County ranks in the top 5% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
11.2%
Child poverty is below the national average.
Children under 187.0%
Working age (18–64)12.2%
Seniors (65+)10.3%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
84.9%
speak English only
Spanish8.2%
Other Indo-European3.8%
Asian & Pacific Islander2.6%
Other languages0.5%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
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 Democratic margin here reached seventy points in 1896. Between 2020 and 2024 the county moved one point toward the Republican candidate; the 2024 margin was fifty-six points.
A population of 328,961, a 78% non-Hispanic-white share, and a median household income of $103,994 describe the county. The county's voting pattern over the last decade is most similar to that of San Juan County and Benton County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Boulder County, Colorado. Akashic. https://akashic.app/county/08013/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More diversifying metro counties
Frequently asked questions
How did Boulder County, Colorado vote in 2024?
In 2024, Boulder County, Colorado voted Democratic by 55.7 points (D+56), carried by the Democratic candidate. Out of 196,304 votes cast, 150,149 went Democratic and 40,758 went Republican.
What is Boulder County, Colorado's political typology?
Akashic places Boulder County, Colorado in the "Diversifying Metro" typology — Mid-size metropolitan counties growing more diverse and trending Democratic. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 18 times, Republican 18 times, and other 1 times.
When did Boulder County, Colorado last vote Republican?
The most recent presidential election in which Boulder County, Colorado voted Republican was 1984.
How many people live in Boulder County, Colorado?
Boulder County, Colorado has a population of 328,961 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Boulder County, Colorado?
Median household income in Boulder County, Colorado is $103,994 — above the national median of $80,734. The Colorado state median is $95,470.
What is the political history of Boulder County, Colorado?
Akashic tracks 38 presidential elections in Boulder County, Colorado from 1876 to 2024. Of those, 18 went Democratic and 18 went Republican. The county's typology — "Diversifying Metro" — captures where that record, its demographics, and its recent swing place it among American communities.