| Place | Postal Code |
|---|---|
| Bangun Saroha, Ranto Baek | 22984 |
| Banjar Maga, Ranto Baek | 22984 |
| Dua Sepakat, Ranto Baek | 22984 |
| Gonting, Ranto Baek | 22984 |
| Gunung Godang, Ranto Baek | 22984 |
| Huta Baringin, Ranto Baek | 22984 |
| Huta Nauli, Ranto Baek | 22984 |
| Huta Raja, Ranto Baek | 22984 |
| Lubuk Kancah, Ranto Baek | 22984 |
| Manisak, Ranto Baek | 22984 |
| Muara Bangko, Ranto Baek | 22984 |
| Padangsilojongan, Ranto Baek | 22982 |
| Ranto Nalinjang, Ranto Baek | 22984 |
| Ranto Panjang, Ranto Baek | 22984 |
| Sampuran, Ranto Baek | 22984 |
| Simaninggir, Ranto Baek | 22984 |
| Simpang Talap, Ranto Baek | 22984 |
| Tandikek, Ranto Baek | 22984 |