Khammam District is a district in Andhra Pradesh, India. It had a population of 2,565,412 of which 19.81% were urban as of 2001 census. Khammam town is the district headquarters. The present name of Khammam is derived its name after a local hill, which was called as 'Stambhadri'. The town was called with different names starting with Stambhadri, Kambhadri, Kambham mettu, Khammam mettu and then finally as Khammam. The Godavari River enters Khammam district from Warangal district and flows nearly 250 km across the district. Khammam district is one of the "Coal mining districts of India."The district has the Singareni Colleries head town , Kothagudem which is also called "Coal town of South India." It is currently a part of the Red Corridor.