Ada County's estimated 2026 population is 557,057 with a growth rate of 2% in the past year according to the most recent United States census data. Ada County is the largest county in Idaho. The 2010 population was 393,369 and has seen a growth of 41.61% since that time.
Data after 2023 is projected based on recent change
Overall: 38.4 years
Female: 39.4 years
Male: 37.6 years
There are 404,742 adults, (84,270 of whom are seniors) in Ada County.
Female: 257,481 (49.6%)
Male: 261,454 (50.4%)
The racial composition of Ada County includes 83.11% White, and smaller percentages for other race, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 431,302 | 83.11% |
| Two or more races | 46,879 | 9.03% |
| Other race | 15,173 | 2.92% |
| Asian | 14,278 | 2.75% |
| Black or African American | 6,901 | 1.33% |
| Native American | 3,444 | 0.66% |
| Native Hawaiian or Pacific Islander | 958 | 0.18% |
Ada County's average per capita income is $54,685. Household income levels show a median of $91,502. The poverty rate stands at 8.34%.
Name | Median | Mean |
|---|---|---|
| Married Families | $124,084 | $162,104 |
| Families | $111,682 | $147,069 |
| Households | $91,502 | $124,631 |
| Non Families | $57,534 | $76,107 |
Average Income
Median Household Income
Poverty Rate
