HDFC Bank is in Follwing Districts in Kerala State

Alappuzha
Alapuzha
Alapuzzha
Cannur
Cochin
Ernakulam
Idukki
Kannur
Kasaragod
Kollam
Kottayam
Kozhikode
Malappuram
Malapturam
Malapuram
Palakkad
Pathanamthitta
Thiruvananthapuram
Thrissur
Trissur
Trivandrum
Varkala
Wayanad