821309 is the PIN Code of Osaon, which is located in Rohtas district, Bihar state.
Osaon Post Office is located at Osaon, Rohtas of BIHAR state. It is a Branch 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 Osaon PO is 821309. This Postoffice falls under Rohtas postal division of the Bihar postal circle.