21 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 96097 | Yreka | 10,154 |
| 96067 | Mount Shasta | 7,321 |
| 96094 | Weed | 6,985 |
| 96064 | Montague | 4,690 |
| 96032 | Fort Jones | 2,606 |
| 96025 | Dunsmuir | 2,247 |
| 96027 | Etna | 1,907 |
| 96044 | Hornbrook | 1,215 |
| 96023 | Dorris | 1,189 |
| 96057 | Mccloud | 1,158 |
| 96058 | Macdoel | 809 |
| 96039 | Happy Camp | 726 |
| 96038 | Grenada | 499 |
| 96050 | Klamath River | 400 |
| 96034 | Gazelle | 345 |
| 96086 | Seiad Valley | 268 |
| 95568 | Somes Bar | 224 |
| 96014 | Callahan | 173 |
| 96037 | Greenview | 131 |
| 96031 | Forks Of Salmon | 66 |
| 96085 | Scott Bar | 38 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 21 ZCTAs in Siskiyou County, California (US Census).