South Indian Bank is in Follwing Districts in Tamil Nadu State

Chennai
Coimbatore
Coimbotore
Cuddalore
Dharmapuri
Dindigul
Erode
Kancheepuram
Kanchipuram
Kanniyakumari
Kanyakumari
Karur
Krishnagiri
Madurai
Nagapattinam
Namakkal
Nilgiri
Nilgiris
Perambalur
Pudukkottai
Salem
Sivaganga
Thanjavur
Theni
Thiruvallur
Thiruvarur
Thoothkudi
Tiruchiorappalli
Tirunelvali
Tiruvallur
Tiruvannamalai
Tuticorin
Vellore
Villupuram
Virudhunagar