Sonipat district is one of the districts of the state of Haryana with headquarters at Sonipat town. The district touches Delhi on one end, Panipat District on the other, and the Yamuna River acting as a border in one direction and Rohtak on the other side. District Sonepat comprises of three sub-divisions namely Ganaur, Sonepat and Gohana and seven blocks (Ganaur,Sonepat ,Rai, Kharkhoda, Gohana, Kathura and Mundlana) has been carved out of Rohtak and made a full fledged District on 22/12/1972. Other smaller towns are Gohana, Ganaur, Murthal and Rai. The total area of Sonipat district is 2,260 sq km.
Sonipat was earlier known as Sonprastha, which later on became Swarnprastha, meaning the "golden city": derived from two Sanskrit words, Swarn (gold) and Prastha (place). Over a period of time, the classical name Swarnprasth's pronunciation degerated into Swarnpat, and then to its current form of Sonipat. The earliest reference of this city comes in the epic Mahabharata, and at that time it was one of the five villages demanded by the Pandavas in lieu of the kingdom of Hastinapur.
The world renowned Atlas Cycles factory is located at Sonipat.