| Big Bar Post Office |
27761 State Highway 299, Big Bar, CA 96010 |
| Burnt Ranch Post Office |
10271c Highway 299, Burnt Ranch, CA 95527 |
| Douglas City Post Office |
140 Steiner Flat Rd, Douglas City, CA 96024 |
| Hayfork Post Office |
7180 State Highway 3, Hayfork, CA 96041 |
| Hyampom Post Office |
22617 Hyampom Rd, Hyampom, CA 96046 |
| Junction City Post Office |
43380a State Highway 299, Junction City, CA 96048 |
| Lewiston Post Office |
4391a Trinity Dam Blvd, Lewiston, CA 96052 |
| Mad River Post Office |
2515b State Highway 36, Mad River, CA 95552 |
| Platina Post Office |
4554 State Highway 36 W, Platina, CA 96076 |
| Salyer Post Office |
1080 Highway 299, Salyer, CA 95563 |
| Trinity Center Post Office |
271 Mary Ave, Trinity Center, CA 96091 |
| Weaverville Post Office |
50 S Miner St, Weaverville, CA 96093 |
| Zenia Post Office |
26531 Ruth Zenia Rd, Zenia, CA 95595 |
