9 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Joliet | Carbon County | 629 |
| Jefferson City | Jefferson County | 442 |
| Jordan | Garfield County | 358 |
| Joplin | Liberty County | 286 |
| Jette | Lake County | 216 |
| Judith Gap | Wheatland County | 107 |
| Jardine | Park County | 73 |
| Jeffers | Madison County | 60 |
| Jackson | Beaverhead County | 27 |