Declo is a city located in Cassia County, Idaho. Declo has a 2025 population of 369. Declo is currently growing at a rate of 1.65% annually and its population has increased by 8.85% since the most recent census, which recorded a population of 339 in 2020.
The average household income in Declo is $68,633 with a poverty rate of 12.52%. The median age in Declo is 38 years: 43.3 years for males, and 29.7 years for females.
Data after 2023 is projected based on recent change
The racial composition of Declo includes 70.82% White, 8.37% other race, and smaller percentages for Black or African American, Native American and multiracial populations.
White (70.8%)
Two or more races (19.3%)
Other race (8.4%)
Black or African American (1.0%)
Native American (0.6%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 364 | 70.82% |
| Two or more races | 99 | 19.26% |
| Other race | 43 | 8.37% |
| Black or African American | 5 | 0.97% |
| Native American | 3 | 0.58% |
Married
Widowed
Divorced
Separated
Never Married
Declo's average per capita income is $48,333. Household income levels show a median of $46,780. The poverty rate stands at 12.52%.
Name | Median | Mean |
|---|---|---|
| Married Families | $119,643 | - |
| Families | $85,938 | $96,992 |
| Households | $46,780 | $68,633 |
| Non Families | $45,353 | $34,585 |
Average Income
Median Household Income
Poverty Rate