Boulder County, CO Population

Overview

328,713

Total Population

37.2

Median age

49.46%

Female population %

102.2:100

Gender ratio (M:F)

20-24 years

Largest age group

42.7

Total dependency ratio

White

Largest racial group

45,907

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

Boulder County's population is young compared to the rest of the country:

The median age in Boulder County is 37.2, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Boulder County's population under 18 was 18.90%, compared to the 22.51% nationwide.
Boulder County's elderly or the senior population (over 65 age) was 14.69% as compared to 16.04% nationwide.
Of the total population in Boulder County, 15.25% were under the age of 15, 25.31% aged 15 to 29, 44.76% aged 30 to 64, 12.94% aged 65 to 84, and 1.74% were 85 years of age and older.

There are 3,567 less females than males in Boulder County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.46% females and 50.54% males in Boulder County, CO.
The Boulder County, CO gender ratio is 102.2:100 i.e. 102.2 men to 100 women (1.022).
For male population, the largest age group is 20-24 years with a population of 17,417.
For the female population, the largest age group is 20-24 years with a population of 15,564.

Boulder County's population has become increasingly diverse:

Racial distribution of Boulder County population: 84.89% are White, 0.90% are Black or African American, 0.44% are American Indian and Alaska Native, 4.72% are Asian, 0.07% are Native Hawaiian and other Pacific Islander, 2.24% are some other race and 6.73% are multiracial.
Boulder County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 45,907 is Hispanic or Latino (of any race), and 282,806 (86.03% of the total population) is Non-Hispanic.
The largest racial group in Boulder County is White with a population of 279,046 (84.89% of the total population).

Boulder County's population has already reached its peak and is showing a trend of decline:

The peak population was 330,922 in the year 2020
From 2000 to 2010, Boulder County's population increased by 23,361 (8.60%), as compared to the national growth of 9.63%.
From 2010 to 2020, Boulder County's population increased by 35,866 (12.16%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, Boulder County's population was lowest in year 2000 at 271,695.