| Name | Ada County |
| State | Idaho |
| FIPS Code | 16001 |
| County Seat | Boise |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 394,961 |
| Population Growth Rate(2000-2022) | 26.15% |
| Majority Ethnicity | White 94.65% |
| Public School Majority Ethnicity | White 75% |
| Partisan Voting Index | Republican:+4 |
| Unemployment Rate (June 2025) | 3.1% |
| Area Code(s) | 208 / 986 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 94.65% |
| African American | 1.38% |
| Hispanic | 0.65% |
| Asian | 2.84% |
| Native American | 0.24% |
| Hawaiin/Pacific Islander | 0.24% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 75.39% |
| African American | 2.57% |
| Hispanic | 14.01% |
| Asian | 2.49% |
| Native American | 0.43% |
| Hawaiin/Pacific Islander | 0.4% |