Indian Overseas Bank is in Follwing Districts in Kerala State

Alapuzha
Alapuzzha
Cannanore
Cannur
Ernakulam
Idukki
Kannur
Kasaragod
Kasargod
Kollam
Kottayam
Kozhikode
Malappuram
Mallappuram
Palakkad
Pathanamthitta
Thiruvananthapuram
Thrissur
Trissur
Trivandrum
Wayanad