Pincode 841231 is a 6-digit postal code serving 9 post offices in Siwan district, Bihar. Andar SO is the Post Office for this area, located at 26.1095°N, 84.2934°E. The first digit ‘8’ identifies the Bihar postal region; the full code pinpoints the Siwan delivery zone.
| Post Office | Type |
|---|---|
| Andar SO | Post Office |
| Bhawrajpur BO | Branch Post Office |
| Faridpur BO | Branch Post Office |
| Gaighat BO | Branch Post Office |
| Jaijore BO | Branch Post Office |
| Kherai BO | Branch Post Office |
| Nadiwan BO | Branch Post Office |
| Nand Pur Amwari BO | Branch Post Office |
| Tiyan BO | Branch Post Office |
Data sourced from India Post, Department of Posts, Government of India. Data last verified: May 2026.
Siwan, Bihar. Map data: OpenStreetMap, CARTO.