Karnataka Bank Limited is in Follwing Districts in Tamil Nadu State

Chennai
Coimbatore
Erode
Kancheepuram
Kanyakumari
Karur
Krishnagiri
Madurai
Namakkal
Nilgiris
Salem
Thanjavur
Thiruvallur
Tiruchirapalli
Tirunelveli
Tirupur
Trichy
Tuticorn
Vellore