8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 96118 | Loyalton | 1,581 |
| 95960 | North San Juan | 594 |
| 96124 | Calpine | 320 |
| 96125 | Sierra City | 234 |
| 96126 | Sierraville | 227 |
| 95910 | Alleghany | 148 |
| 95936 | Downieville | 121 |
| 95944 | Goodyears Bar | 65 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Sierra County, California (US Census).