Find post office by pincode 813104 in district Banka in Bihar, India using online India Pincode finder tool. There are around 23 post offices in district Banka, Bihar, India with similar pincode 813104. All the post offices with pincode 813104 in Banka district of state Bihar are listed above. Finding post office location by pincode is very easy, simply click on any one of the post offices listed above to get its details. For example, if you want to know post office details of Bagduma, just click on the post office name.