How many people live in Canyon County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 266,900 people living in Canyon County, ID. That makes Canyon County the second-most populous county in Idaho. It is home to 13.1% of people living in the state.
267K
population of Canyon County, ID (2024)
13.1%
County share of the Idaho population (2024)
About 266,900 people lived in Canyon County, ID in 2024.
Population estimates, 2000–2024
What are Canyon County, ID’s age demographics?
About 39,700 Canyon County residents are aged 65 and older in 2024. That represents 14.9% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 69,300 Canyon County residents, or 26% 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 Canyon County, ID's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Canyon County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 68.2% of the Canyon County, ID population, higher than the national share of 57.5%. Canyon County, ID also has a larger share of people identifying as Hispanic (26.6%) than the US overall (20%).
In contrast, Canyon County’s non-Hispanic Black or African American population accounts for 0.86%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 1.1% 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.
Canyon County, ID has a higher share of a Hispanic population than Idaho as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Canyon County, ID is Nampa with about 117,400 residents in 2024.
Cities and towns in Canyon County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Nampa | 117,350 |
| 2. | Caldwell | 73,088 |
| 3. | Middleton | 11,730 |
| 4. | Parma | 2,198 |
| 5. | Wilder | 1,725 |
| 6. | Greenleaf | 792 |
| 7. | Melba | 625 |
| 8. | Notus | 606 |
| 9. | Star (pt.) | 53 |
| 10. | Balance of Canyon County | 58,725 |
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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.
