Identifiers: city · CDP · town
| Rank | Community | Population |
|---|---|---|
| 1 | Lewistown (city), MT | 5,952 |
| 2 | Lewistown Heights (CDP), MT | 364 |
| 3 | Moore (town), MT | 194 |
| 4 | Hobson (city), MT | 179 |
| 5 | King Ranch Colony (CDP), MT | 57 |
| 6 | Hilger (CDP), MT | 24 |
| 7 | Moccasin (CDP), MT | 23 |
| 8 | Brooks (CDP), MT | 18 |