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The pin code of Siwan, Siwan, Bihar, IN is 841434. As per the first 2 digits of this Indian postal code, 841434 pin code belongs to post circle Bihar. Last 3 digits of the code are assigned to the Harihar Pur Lalgarh Branch Post Office. Harihar Pur Lalgarh B.O pin code officially comes under Siwan division, and Muzaffarpur region.
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