Indian Overseas Bank is in Follwing Districts in Bihar State

Araria
Arwal
Aurangabad
Begusarai
Bhagalpur
Bhojpur
Buxar
Darbhanga
Gaya
Gopalganj
Hazaribagh
Jehanabad
Katihar
Khagaria
Kishanganj
Madhubani
Munger
Muzaffarpur
Nalanda
Nawada
Patna
Purbi Champaran
Purnisa
Rohtas
Saharsa
Saran
Sheikhpura
Sheohar
Siwan
Vaishali