| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Khu A, Cao Bằng) | 273803 |
| Postal/ZIP Codes in Khu B, Cao Bằng) | 273801 |
| Postal/ZIP Codes in Khu Chợ, Cao Bằng) | 273802 |
| Postal/ZIP Codes in Khu Dả Hương, Cao Bằng) | 273806 |
| Postal/ZIP Codes in Khu Giữa, Cao Bằng) | 273805 |
| Postal/ZIP Codes in Khu Hằng Bó, Cao Bằng) | 273804 |