21 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 96097 | Yreka | 9,964 |
| 96067 | Mount Shasta | 7,839 |
| 96094 | Weed | 6,656 |
| 96064 | Montague | 4,665 |
| 96032 | Fort Jones | 2,408 |
| 96027 | Etna | 1,908 |
| 96025 | Dunsmuir | 1,906 |
| 96023 | Dorris | 1,178 |
| 96044 | Hornbrook | 1,143 |
| 96057 | Mccloud | 1,025 |
| 96058 | Macdoel | 661 |
| 96039 | Happy Camp | 583 |
| 96038 | Grenada | 504 |
| 96050 | Klamath River | 413 |
| 96086 | Seiad Valley | 348 |
| 96034 | Gazelle | 332 |
| 96014 | Callahan | 307 |
| 95568 | Somes Bar | 223 |
| 96037 | Greenview | 168 |
| 96085 | Scott Bar | 71 |
| 96031 | Forks Of Salmon | 66 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 21 ZCTAs in Siskiyou County, California (US Census).