Diaman BO is the primary post office registered under PIN code 802111 in Buxar, Bihar. This code sits within the Eastern Postal Region, with 7 offices operating under it.
| Post office | Type | Full name |
|---|---|---|
| Diaman BO | BO | Branch Post Office |
| Parasia BO | BO | Branch Post Office |
| Sowan BO | BO | Branch Post Office |
| Nuaon BO | BO | Branch Post Office |
| Kathar BO | BO | Branch Post Office |
| Jogia BO | BO | Branch Post Office |
| Arak SO | SO | Sub Post Office |
