Jhunjhunu district is a district of the Indian state Rajasthan in western India. The town Jhunjhunu is the district headquarters. Jhunjhunu is the only district in India which has contributed maximum number of soldiers in Indian Army. As an average every house has one or more soldier serving in Indian Army. it is itself a record and matter of pride for this small district which has produced brave soldier for Indian Army. It is considered as a tradition to serve Nation directly in Indian Army in this district.

Jhunjhunu district is part of Shekhawati Region. Jhunjhunu was ruled by the Kaimkhani Nawabs till 1730. Rohilla Khan was the last Nawab of Jhunjhunu. The Nawabs ruled over Jhunjhunu for 280 years. Rohilla Khan had imposed great faith in Shardul Singh and he acted as his Diwan. Shardul Singh was a bold and efficient administrator. He occupied Jhunjhunu after the death of Rohilla Khan in 1730 A.D.

It was by dint of his subtle political demeanour that Maharao Shardul Singh occupied Jhunjhunu & ruled over it for 12 years. After his death the estate was divided equally among his five sons. Their descendants continued to rule over it till Indian Independence in 1947. Shardul Singh’s religious beliif was instrumental in him having built many temples such as Kalyan Ji Mandir & Gopinath Ji Ka mandir at Jhunjhunu. To commemorate Maharao Shardul Singh, his sons made a monumental dome at Parasrampura ordorned with fresco paintings.

The district falls within Shekhawati region, and is bounded on the northeast and east by Haryana state, on the southeast, south, and southwest by Sikar District, and on the northwest and north by Churu District.

According to the 2011 census Jhunjhunu district has a population of 2,139,658, roughly equal to the nation of Namibia or the US state of New Mexico.This gives it a ranking of 214th in India (out of a total of 640).The district has a population density of 361 inhabitants per square kilometre (930/sq mi).Its population growth rate over the decade 2001-2011 was 11.81%.Jhunjhunun has a sex ratio of 950 females for every 1000 males, and a literacy rate of 74.72%.

The Pasari, Piramals,The Chandaks and The Birla family, four families of prominent Indian industrialists, hail from the district.