How many people live in Custer County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 4,600 people living in Custer County, ID. That makes Custer County the 40th-most populous county in Idaho. It is home to 0.23% of people living in the state.
4.6K
population of Custer County, ID (2024)
0.23%
County share of the Idaho population (2024)
About 4,600 people lived in Custer County, ID in 2024.
Population estimates, 2000–2024
What are Custer County, ID’s age demographics?
About 1,500 Custer County, ID residents are aged 65 and older in 2024. That represents 32.5% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 780 Custer County residents, or 17% of the population, were children under 18. For comparison, the age group represents 23.4% of Idaho’s population and 21.6% in the US overall.
A higher share of Custer County, ID's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Custer County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 90.9% of the Custer County, ID population, higher than the national share of 57.5%. Custer County, ID also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (0.96%) than the US overall (0.72%).
In contrast, Custer County’s Hispanic population accounts for 5.2%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.41% 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.
Custer County, ID has a higher share of a non-Hispanic white population than Idaho as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Custer County, ID is Challis with about 944 residents in 2024.
Cities and towns in Custer County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Challis | 944 |
| 2. | Mackay | 480 |
| 3. | Stanley | 122 |
| 4. | Clayton | 12 |
| 5. | Balance of Custer County | 3,039 |
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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.
