How many people live in Summit County, CO?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 30,900 people living in Summit County, CO. That makes Summit County the 19th-most populous county in Colorado. It is home to 0.51% of people living in the state.
30.9K
population of Summit County, CO (2024)
0.51%
County share of the Colorado population (2024)
About 30,900 people lived in Summit County, CO in 2024.
Population estimates, 2000–2024
What are Summit County, CO’s age demographics?
About 5,100 Summit County residents are aged 65 and older in 2024. That represents 16.6% of its population. For comparison, the age group represents 16.5% of Colorado’s population and 18% in the US overall.
Another 4,800 Summit County, CO residents, or 15.5% 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 Summit County, CO's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Summit County, CO’s racial and ethnic demographics?
Non-Hispanic white residents make up 77% of the Summit County, CO population, higher than the national share of 57.5%.
In contrast, Summit County’s non-Hispanic Black or African American population accounts for 1.5%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 2% of the county, compared with 6.5% 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.
Summit County, CO has a higher share of a non-Hispanic white population than Colorado as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Summit County, CO is Silverthorne with about 5,200 residents in 2024.
Cities and towns in Summit County, CO ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Silverthorne | 5,220 |
| 2. | Breckenridge | 4,892 |
| 3. | Frisco | 2,732 |
| 4. | Dillon | 1,013 |
| 5. | Blue River | 836 |
| 6. | Montezuma | 71 |
| 7. | Balance of Summit County | 16,118 |
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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.
