Post Offices List in Sierra County, California:
| Alleghany Post Office | 356 Main St, Alleghany, CA 95910 |
| Downieville Post Office | 301 Main St, Downieville, CA 95936 |
| Goodyears Bar Post Office | 22 Post Office Spur, Goodyears Bar, CA 95944 |
| Loyalton Post Office | 500 Main St, Loyalton, CA 96118 |
| Sattley Post Office | 131 County Rd, Calpine, CA 96124 |
| Sierra City Post Office | 215 Main St, Sierra City, CA 96125 |
| Sierraville Post Office | 306 Lincoln St, Sierraville, CA 96126 |