8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 96118 | Loyalton | 1,492 |
| 95960 | North San Juan | 568 |
| 96124 | Calpine | 253 |
| 96126 | Sierraville | 233 |
| 96125 | Sierra City | 226 |
| 95936 | Downieville | 191 |
| 95944 | Goodyears Bar | 91 |
| 95910 | Alleghany | 35 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Sierra County, California (US Census).