Historically, Jhajjar is an ancient and traditional region. Some evidences of early inhabitation has been found in this region. This place had witnessed a huge war between Gori and King Prithvi Raj during 1191 AD, at that time the area of Jhajjar was not inhabited. There was a town in the eastern part of the place by the name Malokan where mainly the Jats lived. It is believe that the region started to flourish during the period of Gori. In that period there was a war prone village and most of its natives relocated to different places after every war. As a result, Chajju Jat who was a resident of the village made an appeal in order to rehabilitate the village. But the appeal was not accepted by the Emperor Gori. Moreover, he ordered that to rehabilitate the village somewhere else. Thus, the jats of Malokan came and started to live in the city of Jhajjar. During different periods of time the place was ruled by different rules likewise Mughal rulers, Muslim rulers and the Britishers too. Natives of the district believe that the place got its name from its founder i.e. Chajju which with the passage of time changed into Jhajjar. Whereas some other opinion that the name of the region was taken from the natural fountain by the name Jharnagar. Jhajjar was emerged as a separate district in the map of Haryana state on 15th July, 1997.

Sunil Dabas is a coach of national female Kabbadi team of India. The team won six gold medals, including the 2010 Asian Games and the World Cup-2012 under her coaching. She was rewarded with the prestigious Dronacharya Award and Padma Shri Award in 2012 and 2014 respectively. She is serving as assistant professor and Head of the Department of physical education in Dronacharya Government Postgraduate College in Gurgaon. Naveen Kumar is an Indian athlete, belongs to a Jat family in Haryana. He won a number of medals including the bronze medal in the Asian Games 2014.

Geographically, the district has a total 1,834 sq. km. area and occupies the rank 10th in State and 511th in India on the bases of this size. It lies at the 28°60'N latitude, 76°65'E longitude and 220 m attitude. In the year 2021, there was a total 1.39% forest area of total geographical area. The climate of the district remains extremely hot in the summers and fairly cold in the winters. Most of its rainfall occurs in the monsoon season. The actual rainfall in the district was 1004.8 mm in the year of 2021-22.

Administrative wise, the district is divided into 4 sub-districts, 5 towns and 260 villages. Hindi is its official language. In the state of Haryana with an allotted district code of 83 the district of Jhajjar came into existence on the 15th July, 1997 with its headquarters located at Jhajjar which is situated at a distance of 285 kms from the State Capital.

Demographically, according to the 2011 census, the district has a total number of 1,83,400 households with a total of 9,58,405 comprising 5,14,667 are males and 4,43,738 are females and causing it to rank 17th in the State and 454th in India. The density of population of the district is 523 persons per sq. km. The sex ratio is pegged at 862 females per 1000 males while the child ratio stands at 782 females per 1000 males. The schedule caste population of the district is recorded as 1,70,448 including 90,856 are males and 79,592 are females. The population growth rate during the period 2001 to 2011 was 8.90% out of which 8.02% were males and 9.95% were females. In the year 2020 the number of live births in the district was 12,111 out of which 6,414 were males and 5,697 were females. In the same year the number of deaths in the district was 6,869 out of which 4,410 were males and 2,459 were females. As per 2011 census the major religion in the district is Hindu with 98.67% of the total population. According to 2011 census the principal language in the district is Hindi with 98.94%.

Economically, the district is dependent on industries mainly. A number of small, medium and large scale industries are available here. Multi-product special economic zone in the district is going to be set up by the joint venture of Reliance Ventures (a group company of Reliance Industries) and the Haryana State Industrial and Infrastructure Development Corporation Ltd (HSIIDC). The GDDP or Gross District Domestic Product during the period 2005-06 was Rs. 3,30,769 lakh at Current Price and Rs. 2,65,215 lakh at Constant Prices during the period 1999-2000. The NDDP, or Net District Domestic Product during the period 2005-06 was Rs. 3,00,181 lakh at Current Price and Rs. 2,42,698 lakh at Constant Prices during the period 1999-2000. The Per Capita Income or NDDP, at factor cost during the period 2011-12 was Rs. 76,292 lakh at Current Price during the period 2004-2005. The district has Indira Gandhi Super Thermal Power Project. It was developed by Aravali Power Company comprising the NTPC, IPGCL and HPGCL. Mahatma Gandhi Super Thermal Power Project is also located here. It was developed by CLP India Private Limited.

Education wise, according to the 2011 census, the literacy rate persons is 80.65% persons including 89.31% are males and 70.73% are females. The total literate population of the district is 6,76,091 persons comprising 3,99,480 are males and 2,76,611 are females. It provides a platform for higher education.

Om Prakash Dhankar is the Cabinet Minister in Harayana. He belongs to the Bharatiya Janata Party. He is also serving as the national coordinator for the Narender Modi’s dream project-‘Statue of Unity’ Iron Collection Corporation Committee. He has been member of BJP Kisan Morcha President, twice in 2011 and 2013 respectively. Panna Lal Punia is the Member of the Rajya Sabha from Uttar Pradesh since 2014. He represented Barabanki in the Lok Sabha from 2009 to 2014. He belongs to the Indian National Congress Party. He is also serving as the Chairperson of the National Commission for Scheduled Castes. He was served as an ex officio on the National Human Rights Commission (NHRC). Bhagwat Dayal (Panditji) was the first Chief Minister of the Indian state of Haryana who also served as the Governor of Odisha and Madhya Pradesh during the period 1980-84.

The district has several famous historical and religious places to visit. These places are Bua Wala Talab, Group of Tombs and Mosques, Gurukul, Jhajjar Museum, the Ancient Temple of Pandvas Bhimeshwari Goddess. In the year 2020-2021, there were total 26,003 domestic tourists and 44 foreign tourists who visited the above places. Pratapgarh Farms is a newly made tourist destination. But in couple of years, it has become a famous tourist place now. Bua Wala Talab is a monument related to the love story Bua and Hasan. A group of tombs and mosques are situated around the ‘Bua Ka Talab’. Gurukul Jhajjar is the biggest Archeological Museum in Harayana. It was established in 1959 by Swami Oman and Saraswati. It has a number of antique coins and idols from all over the country. The Bhima Devi Temple Complex is also named as Khajuraho of North India. It was constructed between 8th to 11th centuries AD.