Boulder County's 2026 population is estimated at 333,948, reflecting a 0.55% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Boulder County is the 9th largest county in Colorado. The 2010 population was 295,056 and has grown 13.18% since 2010.
Data after 2023 is projected based on recent change
Overall: 37.7 years
Female: 39 years
Male: 36.6 years
There are 271,246 adults, (53,942 of whom are seniors) in Boulder County.
Female: 163,111 (49.6%)
Male: 165,850 (50.4%)
The racial composition of Boulder County includes 77.78% White, 4.72% Asian, 3.27% other race, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 255,881 | 77.78% |
| Two or more races | 42,689 | 12.98% |
| Asian | 15,523 | 4.72% |
| Other race | 10,773 | 3.27% |
| Black or African American | 2,770 | 0.84% |
| Native American | 1,121 | 0.34% |
| Native Hawaiian or Pacific Islander | 204 | 0.06% |
Boulder County 's average per capita income is $67,063. Household income levels show a median of $103,994. The poverty rate stands at 11.16%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $169,310 | $214,648 |
| Families | $147,203 | $193,674 |
| Households | $103,994 | $148,847 |
| Non Families | $60,783 | $90,566 |
Average Income
Median Household Income
Poverty Rate
