 The discovery of coal in the 18th century led to industrialisation of the area and most of the forests have been cleared.According to the 2011 census, 83.33% of the population of Asansol Sadar subdivision was urban and 16.67% was rural.In 2015, the municipal areas of Kulti, Raniganj and Jamuria were included within the jurisdiction of Asansol Municipal Corporation.Asansol Sadar subdivision has 26 (+1 partly) Census Towns.