| Zip Code | City | Population ↓ |
|---|---|---|
| 59860 | Polson | 11,897 |
| 59911 | Bigfork | 9,493 |
| 59864 | Ronan | 7,301 |
| 59865 | Saint Ignatius | 3,635 |
| 59824 | Charlo | 1,526 |
| 59910 | Big Arm | 692 |
| 59915 | Elmo | 452 |
| 59855 | Pablo | 419 |
| 59914 | Dayton | 345 |
| 59931 | Rollins | 335 |
| 59929 | Proctor | 230 |
| 59863 | Ravalli | 146 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 12 ZCTAs in Lake County, Montana (US Census).