The Princely State of Jhamar was one of the native states during the rule of the British Empire in India. During the early 19th century, the region was appointed as one of the princely states of India under the indirect rule of the British Government of India. The state covered a total area of 4.12 sq miles and comprised of a total population of 561 in the year 1931. The taluka of Jhamar was situated in the District Thana of Wadhwan and contained a village that was located 10 miles towards the northeast of the Wadhwan town. Jhamar state was bounded by the region of Lakhtar in the north; by Bhadvana in the east; and by the territory of Wadhwan in the west and south. The District Thana of Wadhwan was bordered by Limbdi in the south and the east; by Lakhtar in the north; and Wadhwan in the west. Most of the 17 estates were a branch of the Wadhwan region.
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.