6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Shelby | 1 | 3,336 | 3,171 | 1% | 577 | 5.78 | City |
| Sunburst | 2 | 359 | 338 | 1.13% | 187 | 1.92 | Town |
| Hillside Colony | 3 | 324 | 209 | 7.28% | 970 | 0.33 | CDP |
| Rimrock Colony | 4 | 175 | 168 | 7.36% | 557 | 0.31 | CDP |
| Kevin | 5 | 165 | 155 | 1.23% | 457 | 0.36 | Town |
| Sweet Grass | 6 | 87 | 56 | 6.1% | 180 | 0.48 | CDP |
Shelby is the largest city in Toole County, with a population of 3,336.
Sweet Grass is the smallest city in Toole County.
There are 6 cities in Toole County, Montana.