This is a list of the Indian Regional Transport Offices and the assigned codes for vehicle registration. These are broken down to states or union territories and their districts.

AN—Andaman and Nicobar

AP—Andhra Pradesh

The Andhra Pradesh state government has decided to issue uniform registration numbers for vehicles across Andhra Pradesh. Since February 2019, all new vehicles in Andhra Pradesh are registered with AP-39 code by default. Andhra Pradesh is the first state to implement the "one state-one code" policy. The state government has launched new series (AP-40) in 2023.

AR—Arunachal Pradesh

AS—Assam

BR—Bihar

CG—Chhattisgarh

CH—Chandigarh

DD—Dadra and Nagar Haveli and Daman and Diu

DL—Delhi

GA—Goa

GJ—Gujarat

HP—Himachal Pradesh

HR—Haryana

JH—Jharkhand

JK—Jammu and Kashmir

KA—Karnataka

KL—Kerala

LA—Ladakh

LD—Lakshadweep

MH—Maharashtra

ML—Meghalaya

MN—Manipur

MP—Madhya Pradesh

MZ—Mizoram

NL—Nagaland

OD—Odisha

Due to the official respelling of the state name in English (from "Orissa" to "Odisha"), the Transport Department modified the state letter on the plates with OD substituting OR on 1 September 2012.

PB—Punjab

PY—Puducherry

RJ—Rajasthan

SK—Sikkim

TG—Telangana

Note ***** Part of GHMC Hyderabad but not part of Hyderabad Dist. The two-letter state code for Telangana Region in Andhra Pradesh was AP until the State Bifurcation and after the formation of Telangana State, the state was chosen as TS. It continued up to May 2024 before it was changed to TG.

TN—Tamil Nadu

In Tamil Nadu, specific series are exclusively used for certain type of vehicles

TR—Tripura

UK—Uttarakhand

UP—Uttar Pradesh

WB—West Bengal

Sources