Indian Overseas Bank is in Follwing Districts in Kerala State

Adoor
Alamcode
Alappuzha
Alathur
Aluva
Angamaly
Aralumoodu
Attingal
Ayiroor
Ayoor
Ayroor
Baliapatam
Calicut
Chalakudy
Changanassery
Chathanoor
Chavakkad
Chemmad
Chengannur
Chenneerkara
Cherthala
Chettikulangara
Chirainkeezhu
Chittur
Edava
Edayaranmulla
Eloor
Engandiyur
Erattupetta
Ernakulam
Ezhukone
Guruvayur
Haripad
Irinjalakuda
Kadalundi
Kadirur
Kakkanad
Kallara
Kallooppara
Kallumala
Kaloor
Kalpetta
Kanjikode
Kanjirappally
Kannur
Karunagapal
Kasaragod
Kayamkulam
Kechery
Keezhattingal
Kochi
Kodannur
Kodungallur
Kollam
Kollengode
Komalapuram
Kothamangalam
Kottakkal
Kottarakkara
Kottayam
Kozhikode
Kulanada
Kumbalangy
Kumily
Kunnamkulam
Malappuram
Mallappally
Manjeri
Mannarkad
Maradu
Mavelikkara
Mudakkal
Mukkolakkal
Muriyad
Muvattupuzha
Nagampadam
Nagaroor
Navaikulam
Nedumangad
Nellikkunnu
Neyyattinkara
Nileshwar
Ottapalam
Ottasekharamangalam
Palakkad
Palamel
Palode
Pampady
Panappuzha
Pandalam
Parathode
Pathanamthitta
Payyannur
Perintalmanna
Perumbavoor
Perumkadavila
Ponkunnam
Ponnani
Pramadam
Pullur
Punnapra
Puthenkulam
Ranni
Sarkara Chirayankil
Shoranur
Sulthanbathery
Taliparamba
Thalassery
Thiruvalla
Thiruvanantha
Thiruvananthap
Thiruvananthapu
Thiruvananthapuram
Thodupuzha
Thrissur
Tirur
Tiruvanantapurm
Trikkarippur North
Trippunithura
Trivendrum
Udma
Vadakara
Vadasserikonam
Valancherry
Varandrapally
Varkala
Vattiyurkavu
Vellangallore
Vettikavala
Vettoor
Vilavoorkal