A number plate beginning with TN 91 means the vehicle was registered at Chidambaram, Tamil Nadu. Here is what the TN 91 RTO code covers and how to read the full number.
TN 91 RTO details
| RTO code | TN 91 |
|---|---|
| State | Tamil Nadu (TN) |
| Office | Chidambaram |
| District | Cuddalore |
| Office type | Regional Transport Office (RTO) |
| State transport department | Official website |
How to read a TN 91 number plate
Take TN 91 AB 1234 as an example:
- TN: the state or union territory code for Tamil Nadu.
- 91: the RTO number, here Chidambaram.
- AB: the series letters, given out in order as numbers run out.
- 1234: the unique number of the vehicle in that series.
More on this in the number plate format guide. The plate colour also tells you the vehicle type; see number plate colours.
Other RTO codes in Cuddalore district
- TN 31: Cuddalore
TN RTO codes before and after TN 91
| Code | Office | District |
|---|---|---|
| TN 86 | Erode West | Erode |
| TN 87 | Sriperumbudur | Kancheepuram |
| TN 88 | Namakkal South | Namakkal |
| TN 90 | Salem South | Salem |
| TN 92 | Tiruchendur | Thoothukudi |
| TN 93 | Mettur | Salem |
| TN 94 | Palani | Dindigul |
| TN 95 | Sivakasi | Virudhunagar |
See all 87 codes in the Tamil Nadu RTO code list.
Services at the TN 91 office
Like other transport offices, the Chidambaram office handles vehicle registration, transfer of ownership, hypothecation changes, duplicate RC, fitness for transport vehicles and driving licences. Many of these can now be started online on the official Parivahan Sewa portal, and the office then checks documents or the vehicle where needed. For address, timings and fees, check the state transport department website.
This page is an independent guide, not an official record. For the final word on any registration, use the official Vahan service or ask the RTO.
Questions people ask
TN 91 RTO is which city?
TN 91 is the RTO code of Chidambaram in Cuddalore district, Tamil Nadu.
What is the full form of the TN 91 number plate code?
TN stands for Tamil Nadu and 91 is the number of the transport office that registered the vehicle, here Chidambaram.
Can I find the owner of a TN 91 vehicle here?
No. This site only explains codes. Vehicle and owner details are protected; registered owners and authorised users can check their own vehicle on the official Parivahan services.