Vehicle Registration Number or Codes for Tamilnadu, India

Numbering of vehicle in India is done at Regional/Sub Regional Transport Offices located in various states. Each vehicle number has prescribed format. Take an example of a vehicle number TN-75 A 9999, where 'TN' denotes state code for Tamilnadu State, '75' denotes RTOs code for Marthandam, 'A' denotes series and '9999' denotes running serial number between 1 and 9999.

Regional Transport Offices
TN-01	Chennai Central (Chennai District)
TN-02	Chennai North-West (Chennai District)
TN-03	Chennai North-East (Chennai District)
TN-04	Chennai East (Chennai District)
TN-05	Chennai North (Chennai District)
TN-06	Chennai South-East (Chennai District)
TN-07	Chennai South (Chennai District)
TN-09	Chennai West (Chennai District)
TN-10	Chennai South-West (Chennai District)
TN-11	Tambaram, Sollinganallur (Kancheepuram District)
TN-16	Tindivanam (Villupuram District)
TN-18	Redhills, Ambattur (Tiruvallur District)
TN-19	Chengalpattu, Madurantakam (Kancheepuram District)
TN-20	Tiruvallur, Poonamalle (Tiruvallur District)
TN-21	Kancheepuram, Sriperumbudur (Kancheepuram District)
TN-22	Meenambakkam (Kancheepuram District)
TN-23	Vellore, Gudiyatham, Vaniyambadi (Vellore District)
TN-24	Krishnagiri (Krishnagiri District)
TN-25	Tiruvannamalai, Arani (Tiruvannamalai District)
TN-28	Namakkal, Paramathivellore, Rasipuram (Namakkal District)
TN-29	Dharmapuri, Palacode (Dharmapuri District), Harur (Karur District)
TN-30	Salem West, Omalur (Salem District)
TN-31	Cuddalore, Chidambaram, Virudhachalam, Neyveli (Cuddalore District)
TN-32	Villupuram, Kallakurichi, Ulundurpet (Villupuram District)
TN-33	Erode (Erode District)
TN-34	Tiruchencide (Namakkal District)
TN-36	Gobichettipalayam, Bhavani, Sathiyamangalam (Erode District)
TN-37	Coimbatore South (Coimbatore District)
TN-38	Coimbatore North (Coimbatore District)
TN-39	Tiruppur North, Avinashi (Tiruppur District)
TN-40	Mettupalayam (Coimbatore District)
TN-41	Pollachi (Coimbatore District)
TN-42	Tirupur South, Kangayam (Tiruppur District)
TN-43	Ooty, Gudalur (Nilgiris District)
TN-45	Trichirappalli, Thiruverumbur, Manapparai (Trichirappalli District)
TN-46	Perambalur (Perambalur District)
TN-47	Karur, Kulithalai (Karur District)
TN-48	Srirangam, Thuraiyur (Trichirappalli District)
TN-49	Thanjavur, Pattukottai (Thanjavur District)
TN-50	Thiruvarur, Mannargudi (Thiruvarur District)
TN-51	Nagapattinam, Mayiladurai (Nagapattinam District)
TN-52	Sangari, Mettur (Salem District)
TN-54	Salem East (Salem District)
TN-55	Pudukottai, Aranthang (Pudukottai District)
TN-56	Perundurai (Erode District)
TN-57	Dindigul, Ottanchatram, Vadasandur, Batalagundu, Palani (Dindigul District)
TN-58	Madurai South, Thirumangalam (Madurai District)
TN-59	Madurai North, Vadipatti, Melur (Madurai District)
TN-60	Theni, Uthamapalayam (Theni District)
TN-61	Ariyalur (Ariyalur District)
TN-63	Sivaganga, Karaigudi (Sivaganga District)
TN-64	Madurai Central (Madurai District)
TN-65	Ramanathapuram, Paramakudi (Ramanathapuram District)
TN-66	Coimbatore Central (Coimbatore District)
TN-67	Virudhunagar, Sivakasi, Srivilliputhur (Virudhunagar District)
TN-68	Kumbakonam (Thanjavur District)
TN-69	Tuticorin, Tiruchendur, Kovilpatti (Thoothukkudi District)
TN-70	Hosur (Krishnagiri District)
TN-72	Tirunelveli, Vallioor (Tirunelveli District)
TN-73	Ranipet, Arakonam (Vellore District)
TN-74	Nagercoil (Kanyakumari District)
TN-75	Marthandam (Kanyakumari District)
TN-76	Tenkasi, Ambasamuthiram, Sankarankoil (Tirunelveli District)
TN-77	Attur, Valapadi (Salem District)
TN-78	Dharapuram, Udumalpet (Tiruppur District)
TN-??G	Government Vehicles
TN-??N	Tamilnadu State Transport Vehicles