| Place Name | St. Ignatius |
| Place Type | Town |
| ZIP Code(s) | 59865 |
| County | Lake County |
| Area Code(s) | 406 |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 792 |
| Population Growth Rate (2010-19) | -8.79% |
| Majority Ethnicity | White 57.87% |
| US Congressional District(s) | Montana At-Large |
| State House Districts | 15 |
| State Senate Districts | 8 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 57.87% |
| African American | 0% |
| Hispanic | 37.55% |
| Asian | 0% |
| Native American | 0.5% |
| Hawaiin/Pacific Islander | 4.09% |