Karsar is a Branch Post Office (B.O.) located in the Siwan block of the Siwan district in Bihar, India. The delivery status of this post office is available. It is part of the Siwan division of the Muzaffarpur. The pincode of Karsar is 841504.

PIN codes, also known as postal codes, help streamline mail delivery in India. Let's break down the different parts of Karsar's PIN code, 841504:

• (84): This identifies the postal circle, which is a region group of states. In this case, "84" represents the Bihar postal circle.
• (841) : These digits represent the sorting district. Here, "841" points to the Siwan district within Bihar. Mail for this area is sorted here before final delivery.
• (504) : These pinpoint the specific delivery office within the sorting district. For Karsar, "504" corresponds to the Karsar Branch Office.