Dhanbad is a city in the state of Jharkhand, and is also known as the Coal Capital of India. Dhanbad is the 96th fastest growing city in the world. According to the 2011 census, Dhanbad is among the 53 cities of India with a population of more than one million and is the 42nd largest city. It is the most populous city in Jharkhand and while the district is second most populous in the state following Jamshedpur. Among the rail divisions of Indian Railway, Dhanbad Rail Division is the second largest in terms of revenue generation after Mumbai division.
Dhanbad is famous for coal mining. Tata Steel, BCCL, ECL and IISCO (Indian Iron And Steel Company) are some of the companies having coal mines in the district. Coal mining, coal washing, and coke making are the main coal-related industries in the city. IISCO is now owned by SAIL, while BCCL and Eastern Coalfields Limited are subsidiaries of Coal India Limited (CIL); these two companies are the largest operators of coal mines in Dhanbad, and have open cast mines as well as underground mines, whereas Tata Steel has mostly underground mines. These companies have developed townships for their employees. The prestigious Indian School of Mines is located in the heart of the city of Dhanbad