In the year 1935, the territory of Jhamar was merged with Bhoika Thana for expediency, in order to form the Thana of Wadhwan- Bhoika. This region included 35 estates and covered a total area of 347 sq miles and comprised of a total population of 38,719 in the year 1931.
The Princely State of Jhamar was incorporated as a part of the Baroda Agency, which was a sub division of the Western India States Agency. The state was also a part of the erstwhile Eastern Kathiawar Agency and Wadhwan District Thana. Later it became a part of the Indian state of Gujarat. The princely state was generally a non- jurisdictionary state. Jhamar was claimed by more than one ruler, who were formally addressed as shareholder. There were two such shareholders in Jhamar. Both shareholders of Jhamar were Jhala Rajputs, Bhayats of Wadhwan. The estateholders of Wadhwan District Thana were mainly influential and prominent individuals, who were and politically aware. The shareholders of Jhamar paid tribute to Wadhwan. According to the Attachment Scheme of 1943, the state of Jhamar was attached to Wadhwan.
After the independence of India in the year 1947, the princely state of Jhamar was acceded to the newly formed Union of India, which was also known as Dominion of India.