| Post office | Chalna |
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| Official name | Chalna BO |
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| Pin code | 813110 |
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| District | Banka |
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| State | Bihar |
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| Division | Bhagalpur Division |
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| Region | East Region, Bhagalpur |
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| Circle | Bihar Circle |
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Write the address as: Chalna, Banka, Bihar 813110. For legal documents, confirm with your local post office.