How many people live in Cassia County, ID?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 26,000 people living in Cassia County, ID. That makes Cassia County the 16th-most populous county in Idaho. It is home to 1.3% of people living in the state.
26K
population of Cassia County, ID (2024)
1.3%
County share of the Idaho population (2024)
About 26,000 people lived in Cassia County, ID in 2024.
Population estimates, 2000–2024
What are Cassia County, ID’s age demographics?
About 3,900 Cassia County residents are aged 65 and older in 2024. That represents 15% of its population. For comparison, the age group represents 17.7% of Idaho’s population and 18% in the US overall.
Another 7,800 Cassia County residents, or 30.2% 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 Cassia County, ID's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Cassia County, ID’s racial and ethnic demographics?
Non-Hispanic white residents make up 65.5% of the Cassia County, ID population, higher than the national share of 57.5%. Cassia County, ID also has a larger share of people identifying as Hispanic (31.5%) than the US overall (20%).
In contrast, Cassia County’s non-Hispanic Black or African American population accounts for 0.42%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 0.54% 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.
Cassia 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 Cassia County, ID is Burley with about 11,900 residents in 2024.
Cities and towns in Cassia County, ID ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Burley (pt.) | 11,860 |
| 2. | Oakley | 831 |
| 3. | Declo | 363 |
| 4. | Albion | 257 |
| 5. | Malta | 178 |
| 6. | Balance of Cassia County | 12,487 |
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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.
