Post offices Near By with same pincode 821103
| # | Post Office | Town/Taluk | District | State | Pincode |
| 1 | CHAINPUR SO (KAIMUR (BHABUA)) | CHAINPUR | KAIMUR | BIHAR | 821103 |
| 2 | BARARHI BO | MOHANIA | KAIMUR | BIHAR | 821103 |
| 3 | BIUR BO | MOHANIA | KAIMUR | BIHAR | 821103 |
| 4 | MUDHI BO | MOHANIA | KAIMUR | BIHAR | 821103 |
| 5 | SIKANDARPUR BO | MOHANIA | KAIMUR | BIHAR | 821103 |
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The postal system in India was Formed in 1 October 1854 under India Jurisdiction.Headquarters : Dak Bhawan, Sansad Marg, New Delhi
The Postal Index Number (PIN, or sometimes redundantly PIN code) is a six-digit postal code introduced on 15 August 1972. There are total of 19,101 PINs covering 154,725 post offices in India,
The PIN system is organised in the following way:
-The first digit indicates the zone.
-The first two digits indicate the sub-zone (or postal circle).
-The first three digits indicate a sorting district.
-The last three digits indicate the delivery post office.