List of Districts Indian Overseas Bank is avilable in Bihar
ArariaArrahArwalBegusaraiBhagalpurBhojpurBuxarDarbhangaDharampurEast ChamparanGayaGopalganjJehanabadKatiharKhagariaKishanganjKrishna NagarLakhisaraiMadhubaniMungerMuzaffarpurNalandaNawadaPatnaPurniaRaipurRohtasSamastipurSaranSheoharShikarpurSitamarhiSiwanVaishaliWarisaliganjWest Champaran