This pin code is of Siwan Bihar . If you want to get your mail, parcel or courier delivered to this particular address Siwan Bihar , you will have to mention the correct postal code. You can browse through our website to obtain the postal code of any place or to locate the address of a specific pin code.The pin code of Siwan Bihar is 841226 Pin Code of India endeavors to render the correct information of the postal codes of all the states of India.