How many people live in Idaho County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 17,900 people living in Idaho County, ID. That makes Idaho County the 20th-most populous county in Idaho. It is home to 0.88% of people living in the state.
17.9K
population of Idaho County, ID (2024)
0.88%
County share of the Idaho population (2024)
About 17,900 people lived in Idaho County, ID in 2024.
Population estimates, 2000–2024
What are Idaho County, ID’s age demographics?
About 5,400 Idaho County residents are aged 65 and older in 2024. That represents 30.2% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 3,600 Idaho County residents, or 19.8% 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 Idaho County, ID's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Idaho County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 89.9% of the Idaho County, ID population, higher than the national share of 57.5%. Idaho County also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (2.3%) than the US overall (0.72%).
In contrast, Idaho County’s Hispanic population accounts for 4.3%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.51% 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.
Idaho 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 Idaho County, ID is Grangeville with about 3,600 residents in 2024.
Cities and towns in Idaho County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Grangeville | 3,627 |
| 2. | Cottonwood | 921 |
| 3. | Kooskia | 556 |
| 4. | Riggins | 394 |
| 5. | Stites | 187 |
| 6. | Ferdinand | 139 |
| 7. | White Bird | 87 |
| 8. | Kamiah (pt.) | 8 |
| 9. | Balance of Idaho County | 11,993 |
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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.
