| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Rajnigot Milik, Kosi) | 852101 |
| Postal/ZIP Codes in Ranipatti, Kosi) | 852112 |
| Postal/ZIP Codes in Sahebganj Itahari, Kosi) | 852122 |
| Postal/ZIP Codes in Sakhua, Kosi) | 852114 |
| Postal/ZIP Codes in Singhian, Kosi) | 852128 |
| Postal/ZIP Codes in Tamautparsa, Kosi) | 852122 |
| Postal/ZIP Codes in Tirkona, Kosi) | 852122 |