[1] It is 100 kilometres (62 mi) from Gurgaon and comes under National Capital Region (India).

[3] In 1860s it was renamed after Maharaja Mahendra Singh (r. 1721-1748 CE) of Patiala State who was gifted this area by the British East India Company rule for his help in crushing the Indian Rebellion of 1857 in this area.

It has five tehsils of Kanina, Narnaul, Ateli, Nangal Choudhary And Mahendergarh.

Fort of Kanod was built by Maratha ruler Tatya Tope in 1755 CE.

ruler of Patiala, Narendra Singh, changed the name of Kanod Fort to Mahandragarh after his son Mahendra.

At that time, there were three tehsils, namely; Narnaul, Charkhi Dadri and Bawal and Mahendragarh was a sub-tehsil.

In 1978 the district comprised 4 tehsils (Mahendragarh, Rewari, Narnaul and Bawal).