How many people live in Lewis County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 3,700 people living in Lewis County, ID. That makes Lewis County the 41st-most populous county in Idaho. It is home to 0.18% of people living in the state.
3.73K
population of Lewis County, ID (2024)
0.18%
County share of the Idaho population (2024)
About 3,700 people lived in Lewis County, ID in 2024.
Population estimates, 2000–2024
What are Lewis County, ID’s age demographics?
About 1,100 Lewis 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 758 Lewis County residents, or 20.3% 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 Lewis County, ID's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Lewis County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 83.2% of the Lewis County, ID population, higher than the national share of 57.5%. Lewis County, ID also has a larger share of people identifying as non-Hispanic American Indian and Alaska Native (5.4%) than the US overall (0.72%).
In contrast, Lewis County’s Hispanic population accounts for 4.8%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.75% 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.
Lewis County, ID has a higher share of a non-Hispanic American Indian and Alaska Native population than Idaho as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Lewis County, ID is Kamiah with about 1,200 residents in 2024.
Cities and towns in Lewis County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Kamiah (pt.) | 1,155 |
| 2. | Craigmont | 477 |
| 3. | Nezperce | 475 |
| 4. | Winchester | 366 |
| 5. | Reubens | 48 |
| 6. | Balance of Lewis County | 1,207 |
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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.
