Boulder County, Colorado Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 9th-largest in Colorado
The population of Boulder County, Colorado is 328,317 as of the 2023 American Community Survey, making it the 9th-largest county in Colorado. The median household income is $102,772, the median home value is $713,900, and the median age is 37.5.
The population of Boulder County has grown 11.9% since 2010 (295,056 → 330,262), a +0.81% annualized rate.
328,317
Population
+0.81%
Annual growth
452
People / sq mi
$102,772
Median Income
$713,900
Median Home Value
Boulder County covers 726 sq mi of land at 452.0 people per square mile.
About Boulder County, CO
Boulder County is a county in Colorado with a population of 328,317. It ranks #9 among counties in Colorado by population. The median age is 37.5, younger than the national median. The population is 50.5% male and 49.5% female.
The median household income in Boulder County is $102,772, above the US median of $74,580. 4.3% of residents live below the federal poverty level. Home values sit at a median of $713,900, with monthly rent averaging $1,893. The homeownership rate of 62.5% is close to the national rate of 64.8%.
Educational attainment in Boulder County reflects 63.9% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 27.9% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 23.2 minutes each way.
Boulder County Population History (2010-2024)
The county of Boulder County had a population of 295,056 in 2010 and 330,262 in 2024, a 11.9% growth over 14 years. The peak was 330,953 in 2020. Average annual growth rate: 0.81%.
330,262
Population (2024)
295,056
Population (2010)
330,953
Peak (2020)
0.81%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 295,056 |
| 2011 | 300,045 |
| 2012 | 304,717 |
| 2013 | 309,538 |
| 2014 | 312,525 |
| 2015 | 318,408 |
| 2016 | 321,761 |
| 2017 | 323,019 |
| 2018 | 325,438 |
| 2019 | 326,020 |
| 2020 | 330,953 |
| 2021 | 327,133 |
| 2022 | 328,039 |
| 2023 | 328,419 |
| 2024 | 330,262 |
Race & Ethnicity
| White | 80.7% |
| Black or African American | 0.8% |
| Asian | 0.1% |
| Hispanic or Latino (any race) | 1.5% |
| Two or More Races | 0.0% |
Age & Sex
37.5
Median Age
49.5%
Female
50.5%
Male
15.8%
Age 65+
Age Distribution
Children (under 15): 14.4% · Seniors (65+): 15.8%
Income & Poverty
| Median household income | $102,772+$10,302 vs state |
| Mean household income | $144,869 |
| Per-capita income | $60,272 |
| Poverty rate | 4.3%-1.6% vs state |
| Unemployment rate | 3.1% |
| Employment-to-population | 64.1% |
Top Industries by Employment
The largest employment sector in Boulder County is professional & business services, accounting for 24.3% of workers.
How residents commute
3.1%
Drive alone
3.8%
Carpool
55.6%
Public transit
27.9%
Work from home
23.2 min
Avg commute
Housing
$713,900+$211,700 vs state
Median home value
$1,893
Median rent
62.5%
Homeownership rate
142,809
Total housing units
94.7%
Occupied
5.3%
Vacant
37.5%
Renter-occupied
Social & access
95.6%
With health insurance
97.9%
With broadband internet
55.9%
Foreign-born
4.4%
Veterans (18+)
8.8%
With a disability
85.2%
Speak language other than English at home
Education
95.5%
High School+
63.9%
Bachelor's+
Largest cities in Colorado
Other counties in Colorado
Part of Colorado
Metro areas in Colorado
County rankings
Frequently Asked Questions
Boulder County, Colorado has a population of 328,317 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 9th-largest county in Colorado. Population density is 452 people per square mile.
The population of Boulder County has grown 11.9% since 2010 (295,056 → 330,262), a +0.81% annualized rate.
The median household income in Boulder County, Colorado is $102,772, with mean (average) household income of $144,869 and per-capita income of $60,272. 4.3% of residents live below the federal poverty level.
In Boulder County, the largest racial and ethnic groups are White (80.7%), Hispanic or Latino (1.5%), Black or African American (0.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Boulder County, Colorado is 37.5 years. Residents are 49.5% female and 50.5% male.
The median home value in Boulder County is $713,900 and median monthly rent is $1,893. 62.5% of occupied housing units are owner-occupied. The county has 142,809 total housing units, 5.3% of which are vacant.
The largest employment sector in Boulder County, Colorado is professional, scientific, and management services, employing 24.3% of workers. The unemployment rate is 3.1%.
Denver is among the largest cities associated with Boulder County, Colorado, with a population of 713,734.
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Full rankings of Colorado counties
Statewide data for Colorado
Population, race, income, age, and trends across Colorado
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.