Northern Region                  
 Chennai
 Thiruvallur
 Kancheepuram
 Chengelpet
 Tiruttani
 Gummidipoondi (SIPCOT)

Southern Region                  
  Madurai
  Ramnathapuram
  Sivagangai
  Karaikudi
  Palayamkottai
  Tuticorin
  Nagercoil
  Virudhunagar
  Sivakasi
  Rajapalayam

Central Region                     
 Trichy
 Perambalur
 Cuddalore
 Villupuram
 Pudukottai
 Thanjavur
 Thuraiur
 Kumbakonam

Western Region                  
  Coimbatore (south)
  Tiruppur(north)
  Salem
  Erode
  Dhramapuri
  Nammakkal
  Dindigul
  Vellore