| Place | Postal Code |
|---|---|
| Postal/ZIP Codes in Parwania Arazi, Kosi) | 852202 |
| Postal/ZIP Codes in Patuaha, Kosi) | 852202 |
| Postal/ZIP Codes in Rampur, Kosi) | 852202 |
| Postal/ZIP Codes in Rasalpur, Kosi) | 852129 |
| Postal/ZIP Codes in Rohua, Kosi) | 852124 |
| Postal/ZIP Codes in Rohuamon, Kosi) | 852212 |
| Postal/ZIP Codes in Rupanagar, Kosi) | 852202 |
| Postal/ZIP Codes in Saharsa, Kosi) | 852202, 852201 |
| Postal/ZIP Codes in Simraha, Kosi) | 852202 |
| Postal/ZIP Codes in Siradipatti, Kosi) | 852202 |
| Postal/ZIP Codes in Sulindabad, Kosi) | 852202 |
| Postal/ZIP Codes in Tulsiahipatti, Kosi) | 852124 |