Cassia County's 2026 population is estimated at 26,294, reflecting a 0.61% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Cassia County is the 16th largest county in Idaho. The 2010 population was 23,080 and has grown 13.93% since 2010.
Data after 2023 is projected based on recent change
Overall: 33.2 years
Female: 33.4 years
Male: 33 years
There are 17,604 adults, (3,693 of whom are seniors) in Cassia County.
Female: 12,397 (48.6%)
Male: 13,086 (51.4%)
The racial composition of Cassia County includes 69.38% White, 14.76% other race, and smaller percentages for Native American, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 17,679 | 69.38% |
| Other race | 3,762 | 14.76% |
| Two or more races | 3,397 | 13.33% |
| Native American | 456 | 1.79% |
| Black or African American | 118 | 0.46% |
| Asian | 67 | 0.26% |
| Native Hawaiian or Pacific Islander | 4 | 0.02% |
Cassia County 's average per capita income is $42,650. Household income levels show a median of $70,830. The poverty rate stands at 12.41%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $89,204 | - |
| Families | $81,218 | $97,140 |
| Households | $70,830 | $92,485 |
| Non Families | $33,333 | $70,596 |
Average Income
Median Household Income
Poverty Rate
