| Place | Post Code |
|---|---|
| Belhi, Kosi) | 847452, 847237 |
| Bhawanipur Patni, Kosi) | 852125 |
| Chilauni, Kosi) | 852125 |
| Durgapur, Kosi) | 852125 |
| Garhia, Kosi) | 852125 |
| Govindpur, Kosi) | 852125 |
| Inampatti, Kosi) | 852125 |
| Jainagara, Kosi) | 852125 |
| Mouahi, Kosi) | 847452 |
| Parsabirbal, Kosi) | 852125 |
| Pratapganj, Kosi) | 852125 |
| Siripur, Kosi) | 852125 |
| Situhar, Kosi) | 852125 |
| Sukhanagar, Kosi) | 852125 |
| Surjapur, Kosi) | 852125 |
| Tekuna, Kosi) | 852125 |
| Thalha, Kosi) | 852111 |
| Postal Codes in Supaul | |
|---|---|
| Basantpur | |
| Chhatapur | |
| Kishanpur | |
| Marauna | |
| Nirmali | |
| Pipra | |
| Pratapganj | |
| Raghopur | |
| Saraigarh Bhaptiyahi | |
| Supaul | |
| Tribeniganj | |