| Localité | Code postal |
|---|---|
| Callahan, Siskiyou | 96014 |
| Dorris, Siskiyou | 96023 |
| Dunsmuir, Siskiyou | 96025 |
| Edgewood, Siskiyou | 96094 |
| Etna, Siskiyou | 96027 |
| Forks of Salmon, Siskiyou | 96031 |
| Fort Jones, Siskiyou | 96032 |
| Gazelle, Siskiyou | 96034 |
| Greenview, Siskiyou | 96037 |
| Grenada, Siskiyou | 96038 |
| Hammond Ranch, Siskiyou | 96094 |
| Happy Camp, Siskiyou | 96039 |
| Hilt, Siskiyou | 96044 |
| Hornbrook, Siskiyou | 96044 |
| Horse Creek, Siskiyou | 96050 |
| Klamath River, Siskiyou | 96050 |
| Macdoel, Siskiyou | 96058 |
| McCloud, Siskiyou | 96057 |
| Medicine Lake Lodge, Siskiyou | 96134 |
| Montague, Siskiyou | 96064 |
| Mount Shasta, Siskiyou | 96067 |
| Newell, Siskiyou | 96134 |
| Sawyers Bar, Siskiyou | 96027 |
| Scott Bar, Siskiyou | 96085 |
| Seiad Valley, Siskiyou | 96086 |
| Somes Bar, Siskiyou | 95568 |