Dhanbad is a city in the Indian state of Jharkhand, India. It is the most populated city in Jharkhand. Dhanbad along with its urban areas population ranks 33rd in population amongst other cities in India.Dhanbad is famous for its coal mining and has some of the largest mines in India. Tata Steel, Bharat Coking Coal (BCCL), ECL and IISCO (Indian Iron And Steel Company) are some of the companies having coal mines in the district. The Indian School of Mines is located in Dhanbad. Among the rail divisions of Indian Railway, Dhanbad Rail Division is the second largest in terms of revenue generation after the Mumbai division.There are records of settlements in the area from the 7th century. In the modern era, Dhanbad was originally in Dhanbad district before becoming part of Manbhum of Bihar before finally becoming part of Jharkhand state in 2000.The city has one parliamentary seat and six seats in the Legislative Assembly.