Founded in May 11, 1923, Lake County is one of 56 counties in the state of Montana. Historically, Lake County was formed from Flathead County and Missoula County. The city of Polson is the county seat. With FIPS code of 47, Lake County has a population of 32,033 and area of 1,494 square miles (3,869 km2).
List of all cities in Lake County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Arlee, MT | 59821 | 406 |
| Big Arm, MT | 59910 | 406 |
| Charlo, MT | 59824 | 406 |
| Dayton, MT | 59914 | 406 |
| Elmo, MT | 59915 | 406 |
| Moiese, MT | 59824 | 406 |
| Pablo, MT | 59855 | 406 |
| Polson, MT | 59860 | 406 |
| Proctor, MT | 59929 | 406 |
| Ravalli, MT | 59863 | 406 |
| Rollins, MT | 59931 | 406 |
| Ronan, MT | 59864 | 406 |
| Saint Ignatius, MT | 59865 | 406 |