| Place Name | Dewey |
| Place Type | Census Designated Place |
| ZIP Code(s) | 59727 |
| County | Beaverhead County |
| Area Code(s) | 406 |
| Timezone | Mountain Standard Time (MST) |
| Population (2022) | 13 |
| Majority Ethnicity | White 83.33% |
| US Congressional District(s) | Montana At-Large |
| State House Districts | 72 |
| State Senate Districts | 36 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 83.33% |
| African American | 0% |
| Hispanic | 16.67% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |