3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Polson | 1 | 5,866 | 5,160 | 2.05% | 1,255 | 5 | City |
| Ronan | 2 | 2,287 | 1,972 | 2.37% | 1,476 | 2 | City |
| St. Ignatius | 3 | 852 | 786 | 1.31% | 1,598 | 1 | Town |
Polson is the largest city in Lake County, with a population of 5,866.
St. Ignatius is the smallest city in Lake County, with a population of 852.
There are 3 cities in Lake County, Montana.