Jhajjar is a town in Jhajjar district in the Indian state of Haryana. It is a part of Delhi National Capital Region (NCR) and situated on the road connecting Rewari to Rohtak (NH-352), Loharu to Meerut (NH334B), Charkhi Dadri to Delhi and Gurgaon to Bhiwani. Jhajjar is located west of Delhi.
Jhajjar is listed in the Ain-i-Akbari as a pargana under Delhi sarkar, producing a revenue of 1,422,451 dams for the imperial treasury and supplying a force of 1000 infantry and 60 cavalry. Jhajjar was founded by a Gahlawat Jat, Chaudhary Chajju Singh in medieval era.
According to 2011 Indian census, Jhajjar town had a total population of 48424, of which 25678 were males and 22746 were females.
Geeta Bhukkal from the Indian National Congress (INC) is the current MLA of Jhajjar.
Jhajjar has its own railway station, with code JHJ. The railway station of the city is situated on Delhi-Jhajjar-Dadri Road. The station supports four trains, including the first CNG train of India and the Jaipur-Chandigarh Intercity train.