Mahendragarh district is one of the 22 districts of Haryana state in northern India. The district occupies an area of 1,899 km2 and has a population of 922,088 (2021census). District have 3 Sub-divisions : Narnaul, Mahendragarh and Kanina Narnaul city is the administrative headquarters of the district and also the largest city of district. Mahendragarh is one of the very few districts in India where the name of the district and its main town are different. Mahendragarh has total 3 biggest Towns Narnaul, Mahendragarh and Kanina. As of 2011 it is the third least populous district of Haryana (out of 21), after Panchkula and Rewari. The district is named after Maharaja of Patiala - Mahender Singh. This area was given by the British to the prince of patiala after 1857 mutiny During the rule of Mughals, Babur assigned the area to Malik Mahdud Khan. However, later it was taken over by Patiala Riyasat. Birbal ka Chatta is very famous in Narnaul. People say the cave ends in Gurugram. Jal Mahal and Chor Guband were also made during Mughal rule. There is a fort at Mahendragarh which was built by the Maratha ruler Tantia Tope during the 19th century. This fort was named Mahendragarh in 1861 by Narendra Singh, the ruler of Patiala, in honour of his son, Mahendra Singh, and consequently the town came to be known as Mahendragarh. The name of Narnaul Nizamat was changed to "Mahendragarh Nizamat." Another nearby fort is Madhogarh Fort on the top of the hill near Madhogarh village. Both Mahendragarh's fort and Madhogarh's fort are being restored along the lines of Pinjore Gardens to develop them as an international tourist destination as part of the Rewari-Narnaul-Mahendragarh-Madhogarh tourist circuit. Mahendragarh district was formed in 1948 by grouping different tracts of erstwhile princely states: Narnaul and Mahendragarh tehsils from Patiala State, Dadri (Charkhi Dadri) from Jind State and a part of Bawal Nizamat from Nabha State. It became a part of Patiala and East Punjab States Union (PEPSU) state.