3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Polson | 1 | 5,748 | 5,160 | 2.08% | 1,230 | 5 | City |
| Ronan | 2 | 2,234 | 1,972 | 2.38% | 1,442 | 2 | City |
| St. Ignatius | 3 | 841 | 786 | 1.33% | 1,578 | 1 | Town |
Polson is the largest city in Lake County, with a population of 5,748.
St. Ignatius is the smallest city in Lake County, with a population of 841.
There are 3 cities in Lake County, Montana.