How many people live in ?

Updated annually
In 2025, there were 6.01 million people living in Colorado. That makes Colorado the 20th-most populous state, home to 1.8% of people living in the US.

6.01M

population of Colorado (2025)

1.8%

Colorado share of the US population (2025)
The population of Colorado was about 11.1 times higher than it was in 1900. Between 2024 and 2025, the population of Colorado grew by about 24,100 people.

About 6.01 million people lived in Colorado in 2025. That's about 11.1 times more than in 1900.

Annual population estimates

What are Colorado's age demographics?

About 975,900 Colorado residents were aged 65 and older in 2024. That represents 16.5% of the state’s population compared with 18% in the US overall.
Another 1.21 million Colorado residents, or 20.5% of the state’s population, were aged under 18. For comparison, children account for 21.6% of the US population.

A lower share of Colorado's population is 65 and older than the US overall.

Population share by age group (2024)

What are Colorado's racial and ethnic demographics?

A state’s population may have racial and ethnic differences compared with the US overall. These figures reflect how people identified their race alone (not in combination with other races), and separate Hispanic or Latino ethnicity, following Census Bureau reporting standards.
Non-Hispanic white residents make up 64.8% of Colorado’s population, higher than the national share of 57.5%. Colorado also has a larger share of people identifying as Hispanic (23.1%) than the US overall (20%).
In contrast, Colorado’s non-Hispanic Asian population accounted for 3.9%, below the 6.5% share nationwide. The non-Hispanic Black or African American population makes up 4.3% of the state, compared with 12.6% nationally.

A lower share of Colorado's population is non-Hispanic Black or African American than the US overall.

Population share by race and ethnicity (2024)

What are Colorado's most populous counties?

In 2024, five out of 64 counties accounted for over half of Colorado’s population:
  • El Paso County, 752,800 (12.6% of the population)
  • Denver County, 729,000 (12.2%)
  • Arapahoe County, 666,900 (11.1%)
  • Jefferson County, 578,500 (9.7%)
  • Adams County, 543,000 (9.1%)

In 2024, El Paso County was the most populous county in Colorado.

Population estimates

What are Colorado's most populous cities?

The largest city in Colorado is Denver with about 729,000 residents in 2024.

Cities and counties in Colorado ranked by population

Cities and counties in Colorado ranked by population
1.

Denver 

729,019
2.

Colorado Springs

493,554
3.

Aurora 

403,130
4.

Fort Collins

170,924
5.

Lakewood 

156,868
6.

Thornton 

146,689
7.

Arvada 

121,873
8.

Westminster 

115,302
9.

Greeley 

114,363
10.

Pueblo 

111,166

Keep exploring

Methodology

USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.

The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.

Page sources

USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.