| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Babhangawan, Kosi) | 852101 |
| Postal/ZIP Codes in Barhya, Kosi) | 852101 |
| Postal/ZIP Codes in Beijnathpur, Kosi) | 813204, 852101 |
| Postal/ZIP Codes in Belahi, Kosi) | 852101 |
| Postal/ZIP Codes in Bihariganj, Kosi) | 852101 |
| Postal/ZIP Codes in Bishunpur, Kosi) | 852101 |
| Postal/ZIP Codes in Fatehpur, Kosi) | 852101 |
| Postal/ZIP Codes in Gamail, Kosi) | 852101 |
| Postal/ZIP Codes in Gangaura, Kosi) | 852101 |
| Postal/ZIP Codes in Goalpara, Kosi) | 852115 |
| Postal/ZIP Codes in Hatiaundha, Kosi) | 852101 |
| Postal/ZIP Codes in Kalhautia, Kosi) | 852101 |
| Postal/ZIP Codes in Kusthan, Kosi) | 852101 |
| Postal/ZIP Codes in Lachhmipur, Kosi) | 852101 |
| Postal/ZIP Codes in Madhukarchak, Kosi) | 852101 |
| Postal/ZIP Codes in Mohanpur Choumukh, Kosi) | 852101 |
| Postal/ZIP Codes in Mohanpur Nisf, Kosi) | 852101 |
| Postal/ZIP Codes in Rahijagatpur, Kosi) | 852101 |
| Postal/ZIP Codes in Rajganj, Kosi) | 852101 |
| Postal/ZIP Codes in Shekhpura, Kosi) | 852101 |
| Postal/ZIP Codes in Tulasia, Kosi) | 852101 |