18 States of United Rajasthan merged with Princely State Sirohi except Abu and Delwara.
26-01-1950
Re-organised Rajasthan
Under the State Re-organisation Act, 1956 the erstwhile part ‘C’ State of Ajmer, Abu Road Taluka, former part of princely State Sirohi which was merged in former Bombay, State and Sunel Tappa region of the former Madhya Bharat merged with Rajasthan and Sironj subdistrict of Jhalawar district was transferred to Madhya Pradesh.