| Place Name | Mackay |
| Place Type | City |
| ZIP Code(s) | 83251 |
| County | Custer County |
| Area Code(s) | 208 |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 530 |
| Population Growth Rate (2010-19) | -15.09% |
| Majority Ethnicity | White 84.81% |
| US Congressional District(s) | Idaho 2nd |
| State House Districts | 8 |
| State Senate Districts | 8 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 84.81% |
| African American | 0% |
| Hispanic | 0.18% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 15.02% |