The district SAS Nagar is named before its district headquarters, the town SAS Nagar, also known as Mohali. The town SAS Nagar has been named after the name of Sahibzada Ajit Singh elder son of Sh. Guru Gobind Singh Ji, 10th Guru of Sikh religion. The District came into existence on 13th April, 2006 (Baisakhi day). The SAS Nagar is a satellite city of Chandigarh. The district head quarter is adjoining to Chandigarh, the state capital. The district adjoins Himachal Pradesh in the North, Rupnagar in North West, Fatehgarh Sahib and Patiala districts in the South West and in East Chandigarh and Haryana states.SAS Nagar district, included in the Patiala Division of Punjab falls between north latitude 30-32 and 31º-24? and east longitude 76º-18? and 76º-55?.
The district headquarter is adjoining to Chandigarh, the state capital. The district comprises three tehsils, Kharar, Derabassi and Mohali and includes 433 villages and 3 blocks namely Kharar, Derabassi and Majri. All the towns of the district fall on railway line. Most of the area of the district is plain having loam to silt clay & well drained soils except along the Ghaggar River and choes where some sandy patches are found.Some area comprises of Majri & Derabassi block falls in Kandi Area with slight to moderate soil erosion. The Ghaggar river passes close (3 to 6 km) to the towns of Derabassi & Zirakpur. SAS Nagar district has emerged as a major center of technical education. There are more than 10 engineering colleges / Group of Colleges imparting engineering / M.B.A. / Medical / Pharmacy / I.T. / Nursing like variety of technical courses. The Punjab School Education Board has also its Head Quarter at Mohali. A pioneer Institute of Pharmaceuticals & Education Research (NIPER) is also situated at Mohali. Besides large Network of Government Hospitals / Dispensaries there are also numbers of renowned hospitals in the district. The FORTIS Hospital, IVY & SILVER OAK are equipped with multi specialty facilities. District SAS Nagar is emerging as an I.T. Hub of North India. Some big companies like QUARCK, DELL & TCS are already in business and having its establishments whereas others are in the process for opening their offices.