841226 is the PIN Code of Siwan, which is located in Siwan district, Bihar state.
Siwan Post Office is located at Siwan, Siwan of BIHAR state. It is a Head Post Office. A Post Office (PO) / Dak Ghar is a facility in charge of sorting, processing, and delivering mail to recipients. POs are usually regulated and funded by the Government of India (GOI). Pin code of Siwan PO is 841226. This Postoffice falls under Siwan postal division of the Bihar postal circle.