| Locality | Post Code |
|---|---|
| Apgar, Flathead | 59936 |
| Bigfork, Flathead | 59911 |
| Columbia Falls, Flathead | 59912 |
| Coram, Flathead | 59913 |
| Creston, Flathead | 59901 |
| Essex, Flathead | 59916 |
| Evergreen, Flathead | 59901 |
| Hungry Horse, Flathead | 59919 |
| Kalispell, Flathead | 59901, 59903 |
| Kila, Flathead | 59920 |
| Lake McDonald, Flathead | 59921 |
| Lakeside, Flathead | 59922 |
| Marion, Flathead | 59925 |
| Martin City, Flathead | 59926 |
| Olney, Flathead | 59927 |
| Polebridge, Flathead | 59928 |
| Somers, Flathead | 59932 |
| Swan Lake, Flathead | 59911 |
| West Glacier, Flathead | 59936 |
| Whitefish, Flathead | 59937 |