| Place | Post Code |
|---|---|
| Alas, Mandaon | 5411 |
| Ayat, Mandaon | 5411 |
| Bat-Ongan, Mandaon | 5411 |
| Bugtong, Mandaon | 5411 |
| Buri, Mandaon | 5411 |
| Cabitan, Mandaon | 5411 |
| Cagmasoso, Mandaon | 5411 |
| Canomoy, Mandaon | 5411 |
| Centro, Mandaon | 5411 |
| Dayao, Mandaon | 5411 |
| Guincaiptan, Mandaon | 5411 |
| Laguinbanwa, Mandaon | 5411 |
| Lantangan, Mandaon | 5411 |
| Looc, Mandaon | 5411 |
| Mabatobato, Mandaon | 5411 |
| Maolingon, Mandaon | 5411 |
| Nailaban, Mandaon | 5411 |
| Nanipsan, Mandaon | 5411 |
| Pinamangcaan, Mandaon | 5411 |
| Poblacion, Mandaon | 5411 |
| Polo Dacu, Mandaon | 5411 |
| San Juan, Mandaon | 5411 |
| San Pablo, Mandaon | 5411 |
| Santa Fe, Mandaon | 5411 |
| Tagpu, Mandaon | 5411 |
| Tumalaytay, Mandaon | 5411 |