| Vehicle RTO Codes | District/Region |
|---|---|
| TN-01 | Chennai Central (Ayanavaram) |
| TN-02 | Chennai North West (Anna Nagar) |
| TN-03 | Chennai North East (Tondiarpet) |
| TN-04 | Chennai East (Royapuram) |
| TN-05 | Chennai North (Kolathur) |
| TN-06 | Chennai South East (Mandavelli) |
| TN-07 | Chennai South (Thiruvanmiyur) |
| TN-09 | Chennai West (K. K. Nagar) |
| TN-10 | Chennai South West (Virugambakkam) |
| TN-11 | Tambaram |
| TN-12 | Poonamallee |
| TN-13 | Ambattur |
| TN-14 | Sholinganallur |
| TN-15 | Ulundurpet / Kallakurichi |
| TN-16 | Tindivanam |
| TN-18 | Red Hills / Gummidipoondi |
| TN-19 | Chengalpattu / Madurantakam |
| TN-20 | Tiruvallur / Thiruttani |
| TN-21 | Kanchipuram / Sriperumbudur |
| TN-22 | Meenambakkam |
| TN-23 | Vellore / Gudiyatham |
| TN-24 | Krishnagiri |
| TN-25 | Thiruvannamalai / Arani |
| TN-27 | Salem (not in use after 1999) |
| TN-28 | Namakkal North / Rasipuram |
| TN-29 | Dharmapuri / Palacode / Harur |
| TN-30 | Salem West / Omalur |
| TN-31 | Cuddalore / Panruti |
| TN-32 | Villupuram |
| TN-33 | Erode East |
| TN-34 | Thiruchengode |
| TN-36 | Gobichettipalayam / Bhavani / Satyamangalam |
| TN-37 | Coimbatore South / Sulur |
| TN-38 | Coimbatore North |
| TN-39 | Tirupur North / Avinashi |
| TN-40 | Mettupalayam |
| TN-41 | Pollachi / Valparai |
| TN-42 | Tirupur South / Kangeyam |
| TN-43 | Udagamandalam / Gudalur |
| TN-45 | Tiruchirapalli West / Manapparai |
| TN-46 | Perambalur |
| TN-47 | Karur / Aravakurichi / Kulithalai |
| TN-48 | Srirangam / Musiri / Thuraiyur |
| TN-49 | Thanjavur / Pattukottai |
| TN-50 | Tiruvarur / Mannargudi |
| TN-51 | Nagapattinam |
| TN-52 | Sankagiri / Mettur |
| TN-54 | Salem East |
| TN-55 | Pudukottai / Iluppur / Aranthangi |
| TN-56 | Perundurai |
| TN-57 | Dindigul / Oddanchatram / Vedasandur / Batlagundu / Palani |
| TN-58 | Madurai South / Tirumangalam |
| TN-59 | Madurai North / Vadipatti / Melur |
| TN-60 | Theni / Uthamapalayam |
| TN-61 | Ariyalur |
| TN-63 | Sivagangai / Karaikudi |
| TN-64 | Madurai Central |
| TN-65 | Ramanathapuram / Paramakudi |
| TN-66 | Coimbatore Central |
| TN-67 | Virudhunagar / Aruppukkottai |
| TN-68 | Kumbakonam |
| TN-69 | Thoothukudi / Kovilpatti |
| TN-70 | Hosur |
| TN-72 | Tirunelveli / Valliyur |
| TN-73 | Ranipet / Arakkonam / Arcot |
| TN-74 | Nagercoil |
| TN-75 | Marthandam / Kanyakumari |
| TN-76 | Tenkasi / Ambasamudram |
| TN-77 | Attur / Vazhapadi |
| TN-78 | Dharapuram / Udumalpet |
| TN-79 | Sankarankovil |
| TN-81 | Tiruchirapalli East / Thiruverumbur |
| TN-82 | Mayiladuthurai / Sirkazhi |
| TN-83 | Vaniyambadi / Tirupattur |
| TN-84 | Srivilliputhur / Sivakasi |
| TN-85 | Kundrathur / Manapakkam |
| TN-86 | Erode West |
| TN-88 | Namakkal South / Paramathi Vellore |
| TN-90 | Salem South |
| TN-91 | Chidambaram / Virudhachalam / Neyveli |
| TN-92 | Thiruchendur |
| TN-99 | Coimbatore West |
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