How many people live in Arapahoe County, CO?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 666,900 people living in Arapahoe County, CO. That makes Arapahoe County the third-most populous county in Colorado. It is home to 11.1% of people living in the state.
667K
population of Arapahoe County, CO (2024)
11.1%
County share of the Colorado population (2024)
About 666,900 people lived in Arapahoe County, CO in 2024.
Population estimates, 2000–2024
What are Arapahoe County, CO’s age demographics?
About 101,100 Arapahoe County residents are aged 65 and older in 2024. That represents 15.2% of its population. For comparison, the age group represents 16.5% of Colorado’s population and 18% in the US overall.
Another 147,000 Arapahoe County residents, or 22% of the population, were children under 18. For comparison, the age group represents 20.5% of Colorado’s population and 21.6% in the US overall.
A higher share of Arapahoe County, CO's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Arapahoe County, CO’s racial and ethnic demographics?
Hispanic residents make up 22.8% of the Arapahoe County, CO population, higher than the national share of 20%. Arapahoe County, CO also has a larger share of people identifying as non-Hispanic Asian (7%) than the US overall (6.5%).
In contrast, Arapahoe County’s non-Hispanic white population accounts for 54.7%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 11.2% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Arapahoe County, CO has a higher share of a non-Hispanic Black or African American population than Colorado as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Arapahoe County, CO is Aurora with about 341,300 residents in 2024.
Cities and towns in Arapahoe County, CO ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Aurora (pt.) | 341,313 |
| 2. | Centennial | 108,853 |
| 3. | Littleton (pt.) | 42,044 |
| 4. | Englewood | 35,238 |
| 5. | Greenwood Village | 15,288 |
| 6. | Cherry Hills Village | 6,349 |
| 7. | Sheridan | 5,932 |
| 8. | Glendale | 4,465 |
| 9. | Columbine Valley | 1,683 |
| 10. | Deer Trail | 1,624 |
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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.
